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GitHub - fgsect/FitM: FitM, the Fuzzer in the Middle, can fuzz client and server binaries at the same time using userspace snapshot-fuzzing and network emulation. It's fast and comparably easy to set up.
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octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"blog","context":"product","tag":"link","label":"blog_link_product_navbar"}" href="https://github.blog"> Blog <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0 pb-lg-3 mb-3 mb-lg-0"> <span class="d-block h4 color-fg-default my-1" id="solutions-by-company-size-heading">By company size</span> <ul class="list-style-none f5" aria-labelledby="solutions-by-company-size-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"enterprises","context":"solutions","tag":"link","label":"enterprises_link_solutions_navbar"}" href="https://github.com/enterprise"> Enterprises </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"small_and_medium_teams","context":"solutions","tag":"link","label":"small_and_medium_teams_link_solutions_navbar"}" href="https://github.com/team"> Small and medium teams </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"startups","context":"solutions","tag":"link","label":"startups_link_solutions_navbar"}" href="https://github.com/enterprise/startups"> Startups </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"nonprofits","context":"solutions","tag":"link","label":"nonprofits_link_solutions_navbar"}" href="/solutions/industry/nonprofits"> Nonprofits </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="solutions-by-use-case-heading">By use case</span> <ul class="list-style-none f5" aria-labelledby="solutions-by-use-case-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"devsecops","context":"solutions","tag":"link","label":"devsecops_link_solutions_navbar"}" href="/solutions/use-case/devsecops"> DevSecOps </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"devops","context":"solutions","tag":"link","label":"devops_link_solutions_navbar"}" href="/solutions/use-case/devops"> DevOps </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"ci_cd","context":"solutions","tag":"link","label":"ci_cd_link_solutions_navbar"}" href="/solutions/use-case/ci-cd"> CI/CD </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"view_all_use_cases","context":"solutions","tag":"link","label":"view_all_use_cases_link_solutions_navbar"}" href="/solutions/use-case"> View all use cases </a></li> </ul> </div> </div> <div class="HeaderMenu-column px-lg-4"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="solutions-by-industry-heading">By industry</span> <ul class="list-style-none f5" aria-labelledby="solutions-by-industry-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"healthcare","context":"solutions","tag":"link","label":"healthcare_link_solutions_navbar"}" href="/solutions/industry/healthcare"> Healthcare </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"financial_services","context":"solutions","tag":"link","label":"financial_services_link_solutions_navbar"}" href="/solutions/industry/financial-services"> Financial services </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"manufacturing","context":"solutions","tag":"link","label":"manufacturing_link_solutions_navbar"}" href="/solutions/industry/manufacturing"> Manufacturing </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"government","context":"solutions","tag":"link","label":"government_link_solutions_navbar"}" href="/solutions/industry/government"> Government </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"view_all_industries","context":"solutions","tag":"link","label":"view_all_industries_link_solutions_navbar"}" href="/solutions/industry"> View all industries </a></li> </ul> </div> </div> <div class="HeaderMenu-trailing-link rounded-bottom-2 flex-shrink-0 mt-lg-4 px-lg-4 py-4 py-lg-3 f5 text-semibold"> <a href="/solutions"> View all solutions <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-right HeaderMenu-trailing-link-icon"> <path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 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d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span> <ul class="list-style-none f5" aria-labelledby="resources-topics-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"ai","context":"resources","tag":"link","label":"ai_link_resources_navbar"}" href="/resources/articles/ai"> AI </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"devops","context":"resources","tag":"link","label":"devops_link_resources_navbar"}" href="/resources/articles/devops"> DevOps </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"security","context":"resources","tag":"link","label":"security_link_resources_navbar"}" href="/resources/articles/security"> Security </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"software_development","context":"resources","tag":"link","label":"software_development_link_resources_navbar"}" href="/resources/articles/software-development"> Software Development </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"view_all","context":"resources","tag":"link","label":"view_all_link_resources_navbar"}" href="/resources/articles"> View all </a></li> </ul> </div> </div> <div class="HeaderMenu-column px-lg-4"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-explore-heading">Explore</span> <ul class="list-style-none f5" aria-labelledby="resources-explore-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"learning_pathways","context":"resources","tag":"link","label":"learning_pathways_link_resources_navbar"}" href="https://resources.github.com/learn/pathways"> Learning Pathways <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"events_amp_webinars","context":"resources","tag":"link","label":"events_amp_webinars_link_resources_navbar"}" href="https://resources.github.com"> Events & Webinars <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"ebooks_amp_whitepapers","context":"resources","tag":"link","label":"ebooks_amp_whitepapers_link_resources_navbar"}" href="https://github.com/resources/whitepapers"> Ebooks & Whitepapers </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"customer_stories","context":"resources","tag":"link","label":"customer_stories_link_resources_navbar"}" href="https://github.com/customer-stories"> Customer Stories </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"partners","context":"resources","tag":"link","label":"partners_link_resources_navbar"}" href="https://partner.github.com"> Partners <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"executive_insights","context":"resources","tag":"link","label":"executive_insights_link_resources_navbar"}" href="https://github.com/solutions/executive-insights"> Executive Insights </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Open Source <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"the_readme_project","context":"open_source","tag":"link","label":"the_readme_project_link_open_source_navbar"}" href="https://github.com/readme"> <div> <div class="color-fg-default h4">The ReadME Project</div> GitHub community articles </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="open-source-repositories-heading">Repositories</span> <ul class="list-style-none f5" aria-labelledby="open-source-repositories-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"topics","context":"open_source","tag":"link","label":"topics_link_open_source_navbar"}" href="https://github.com/topics"> Topics </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" 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viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"enterprise_platform","context":"enterprise","tag":"link","label":"enterprise_platform_link_enterprise_navbar"}" href="/enterprise"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" 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data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="nHRMT0o7cBpdY8lTHSVA8QDWm83vnU+mf/4wMVD9Nby6cNxqJtqE+hRnEREpVpxutVHjvh7ggiINyY/sBL/QAg==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" id="custom_scope_id" name="custom_scope_id" data-target="custom-scopes.customScopesIdField"> <div class="form-group"> <label for="custom_scope_name">Name</label> <auto-check src="/search/custom_scopes/check_name" required only-validate-on-blur="false"> <input type="text" name="custom_scope_name" id="custom_scope_name" data-target="custom-scopes.customScopesNameField" class="form-control" autocomplete="off" placeholder="github-ruby" required maxlength="50"> <input type="hidden" data-csrf="true" value="fJcchotDrAwh4QYk0+hd6vf8fTjEDHDMHJzPwg1I942n3UOnIR7mbvoSltqrZTdaELv2/XrW25TTHbaTERNOZQ==" /> </auto-check> </div> <div class="form-group"> <label for="custom_scope_query">Query</label> <input type="text" name="custom_scope_query" id="custom_scope_query" data-target="custom-scopes.customScopesQueryField" class="form-control" autocomplete="off" placeholder="(repo:mona/a OR repo:mona/b) AND lang:python" required maxlength="500"> </div> <p class="text-small color-fg-muted"> To see all available qualifiers, see our <a class="Link--inTextBlock" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax">documentation</a>. </p> </form> </div> <div data-target="custom-scopes.manageCustomScopesForm"> <div data-target="custom-scopes.list"></div> </div> </div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd Overlay-footer--divided"> <button data-action="click:custom-scopes#customScopesCancel" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="custom-scopes-dialog-form" data-action="click:custom-scopes#customScopesSubmit" data-target="custom-scopes.customScopesSubmitButton" type="submit" data-view-component="true" class="btn-primary btn"> Create saved search </button> </div> </dialog></dialog-helper> </custom-scopes> </div> </qbsearch-input> <div class="position-relative HeaderMenu-link-wrap d-lg-inline-block"> <a href="/login?return_to=https%3A%2F%2Fgithub.com%2Ffgsect%2FFitM" class="HeaderMenu-link HeaderMenu-link--sign-in HeaderMenu-button flex-shrink-0 no-underline d-none d-lg-inline-flex border border-lg-0 rounded rounded-lg-0 px-2 py-1" style="margin-left: 12px;" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"site header menu","repository_id":null,"auth_type":"SIGN_UP","originating_url":"https://github.com/fgsect/FitM","user_id":null}}" data-hydro-click-hmac="6d495b938173fbc0f26cbf81413d4fd9f9a19ed8411eb17998c31080f37947e0" data-analytics-event="{"category":"Marketing nav","action":"click to go to homepage","label":"ref_page:Marketing;ref_cta:Sign in;ref_loc:Header"}" > Sign in </a> </div> <a href="/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E&source=header-repo&source_repo=fgsect%2FFitM" class="HeaderMenu-link HeaderMenu-link--sign-up HeaderMenu-button flex-shrink-0 d-flex d-lg-inline-flex no-underline border color-border-default rounded px-2 py-1" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"site header menu","repository_id":null,"auth_type":"SIGN_UP","originating_url":"https://github.com/fgsect/FitM","user_id":null}}" data-hydro-click-hmac="6d495b938173fbc0f26cbf81413d4fd9f9a19ed8411eb17998c31080f37947e0" data-analytics-event="{"category":"Sign up","action":"click to sign up for 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data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"repo details fork button","repository_id":334654383,"auth_type":"LOG_IN","originating_url":"https://github.com/fgsect/FitM","user_id":null}}" data-hydro-click-hmac="4535902f503dd0c26988c974097c3ecfde529526ccb4c10ffba85fbdcb152da2" data-view-component="true" class="btn-sm btn"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg>Fork <span id="repo-network-counter" data-pjax-replace="true" data-turbo-replace="true" title="20" 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1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg><span data-view-component="true" class="d-inline"> Star </span> <span id="repo-stars-counter-star" aria-label="288 users starred this repository" data-singular-suffix="user starred this repository" data-plural-suffix="users starred this repository" data-turbo-replace="true" title="288" data-view-component="true" class="Counter js-social-count">288</span> </a></div> </li> </ul> </div> </div> <div id="responsive-meta-container" data-turbo-replace> <div class="d-block d-md-none mb-2 px-3 px-md-4 px-lg-5"> <p class="f4 mb-3 "> FitM, the Fuzzer in the Middle, can fuzz client and server binaries at the same time using userspace snapshot-fuzzing and network emulation. It's fast and comparably easy to set up. </p> <h3 class="sr-only">License</h3> <div class="mb-2"> <a href="/fgsect/FitM/blob/main/LICENSE" class="Link--muted" data-analytics-event="{"category":"Repository Overview","action":"click","label":"location:sidebar;file:license"}" > <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-law mr-2"> <path d="M8.75.75V2h.985c.304 0 .603.08.867.231l1.29.736c.038.022.08.033.124.033h2.234a.75.75 0 0 1 0 1.5h-.427l2.111 4.692a.75.75 0 0 1-.154.838l-.53-.53.529.531-.001.002-.002.002-.006.006-.006.005-.01.01-.045.04c-.21.176-.441.327-.686.45C14.556 10.78 13.88 11 13 11a4.498 4.498 0 0 1-2.023-.454 3.544 3.544 0 0 1-.686-.45l-.045-.04-.016-.015-.006-.006-.004-.004v-.001a.75.75 0 0 1-.154-.838L12.178 4.5h-.162c-.305 0-.604-.079-.868-.231l-1.29-.736a.245.245 0 0 0-.124-.033H8.75V13h2.5a.75.75 0 0 1 0 1.5h-6.5a.75.75 0 0 1 0-1.5h2.5V3.5h-.984a.245.245 0 0 0-.124.033l-1.289.737c-.265.15-.564.23-.869.23h-.162l2.112 4.692a.75.75 0 0 1-.154.838l-.53-.53.529.531-.001.002-.002.002-.006.006-.016.015-.045.04c-.21.176-.441.327-.686.45C4.556 10.78 3.88 11 3 11a4.498 4.498 0 0 1-2.023-.454 3.544 3.544 0 0 1-.686-.45l-.045-.04-.016-.015-.006-.006-.004-.004v-.001a.75.75 0 0 1-.154-.838L2.178 4.5H1.75a.75.75 0 0 1 0-1.5h2.234a.249.249 0 0 0 .125-.033l1.288-.737c.265-.15.564-.23.869-.23h.984V.75a.75.75 0 0 1 1.5 0Zm2.945 8.477c.285.135.718.273 1.305.273s1.02-.138 1.305-.273L13 6.327Zm-10 0c.285.135.718.273 1.305.273s1.02-.138 1.305-.273L3 6.327Z"></path> </svg> MIT license </a> </div> <div class="mb-3"> <a class="Link--secondary no-underline mr-3" href="/fgsect/FitM/stargazers"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-star mr-1"> <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg> <span class="text-bold">288</span> stars </a> <a class="Link--secondary no-underline mr-3" href="/fgsect/FitM/forks"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-1"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 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Middle\u003c/h1\u003e\u003ca id=\"user-content-fitm-the-fuzzer-in-the-middle\" class=\"anchor\" aria-label=\"Permalink: FitM, the Fuzzer in the Middle\" href=\"#fitm-the-fuzzer-in-the-middle\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp align=\"center\" dir=\"auto\"\u003e\n \u003ca target=\"_blank\" rel=\"noopener noreferrer nofollow\" href=\"https://user-images.githubusercontent.com/22647728/158073817-5ed845b2-46ea-4ce9-8ae3-4103b30653f6.gif\"\u003e\u003cimg width=\"460\" height=\"300\" src=\"https://user-images.githubusercontent.com/22647728/158073817-5ed845b2-46ea-4ce9-8ae3-4103b30653f6.gif\" data-animated-image=\"\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFitM, the Fuzzer-in-the-Middle, is a AFL++-based coverage-guided fuzzer for stateful, binary-only client-server applications.\nIt can be used in situations where you would normally turn to grammar-based fuzzers or start patching your target. With FitM you can explore the communication between client and server by fuzzing them at the same time.\nIt builds on top of \u003ca href=\"https://github.com/AFLplusplus/qemuafl\"\u003eqemuafl\u003c/a\u003e for emulation and \u003ca href=\"https://criu.org/Main_Page\" rel=\"nofollow\"\u003eCRIU\u003c/a\u003e for userspace snapshots. No source code needed!\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow it works\u003c/h2\u003e\u003ca id=\"user-content-how-it-works\" class=\"anchor\" aria-label=\"Permalink: How it works\" href=\"#how-it-works\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe FitM tool uses \u003ca href=\"https://github.com/fgsect/FitM-qemu\"\u003eFitM-qemu\u003c/a\u003e for instrumentation.\nFitM-qemu extends qemuafl with a network emulation layer on the syscall level.\nWith it, we can fuzz two targets (binary A \u0026amp; B) at the same time, usually a server and a client and schedule different snapshots of these processes (\"generations\") we collect while exploring the protocol.\nEach generation represents a stage in the protocol's communication levels that the client-server pair speaks.\nThe fuzzer starts in generation 0 with binary A. This binary should produce some output without needing any input.\nUsing the initial output of binary A as seed, FitM will fuzz binary B for a while.\nAfterwards, FitM creates a set of new snapshots of B, generation 3, for later.\nNext, the snapshot of generation 0 (binary A) is restored, seeded with generation 1's output and fuzzed (generation 2).\nA snapshot is always created during a receive call that followed a send call until we fully explore the client-server interaction.\nThe below figure depicts this cycle.\u003c/p\u003e\n\u003cp align=\"center\" dir=\"auto\"\u003e\n\u003ca target=\"_blank\" rel=\"noopener noreferrer nofollow\" href=\"https://user-images.githubusercontent.com/297744/159170739-f8d8d551-e42f-4c76-ae62-902d44b86026.svg\"\u003e\u003cimg width=\"400\" alt=\"Overview over the different stages of FitM, see paper\" src=\"https://user-images.githubusercontent.com/297744/159170739-f8d8d551-e42f-4c76-ae62-902d44b86026.svg\" align=\"center\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\n\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSee \u003ca href=\"/fgsect/FitM/blob/main/fitm.pdf\"\u003eour paper\u003c/a\u003e for technical explanations, benchmarks, and further details.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGetting Started\u003c/h2\u003e\u003ca id=\"user-content-getting-started\" class=\"anchor\" aria-label=\"Permalink: Getting Started\" href=\"#getting-started\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis module uses submodules. Clone with \u003ccode\u003e--recurse-submodules\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAlternatively, run the following after cloning:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"git submodule init\ngit submodule update\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003egit submodule init\ngit submodule update\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuilding\u003c/h2\u003e\u003ca id=\"user-content-building\" class=\"anchor\" aria-label=\"Permalink: Building\" href=\"#building\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"vagrant up\nvagrant ssh\ncd /vagrant\nmake\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003evagrant up\nvagrant ssh\ncd /vagrant\nmake\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you don't want to use the provided Vagrantfile you can read the provided \u003ccode\u003eprovision.sh\u003c/code\u003e script to understand the necessary dependencies. In general you will need packages to build \u003ca href=\"https://github.com/AFLplusplus/qemuafl/blob/master/README.rst\"\u003eQEMU\u003c/a\u003e and \u003ca href=\"https://criu.org/Installation#Installing_build_dependencies\" rel=\"nofollow\"\u003eCriu\u003c/a\u003e. Additionally, you will need a stable \u003ca href=\"https://www.rust-lang.org/tools/install\" rel=\"nofollow\"\u003erust toolchain\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRunning\u003c/h2\u003e\u003ca id=\"user-content-running\" class=\"anchor\" aria-label=\"Permalink: Running\" href=\"#running\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eRun this: \u003ccode\u003eFITM_ARGS=config/fitm-args.ftp.json make run\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe fuzzer will create the folders \u003ccode\u003eactive-state\u003c/code\u003e, \u003ccode\u003esaved-states\u003c/code\u003e and \u003ccode\u003ecmin-tmp\u003c/code\u003e.\nWhenever afl-cmin is used the inputs that should be fed into cmin are put into \u003ccode\u003ecmin-tmp\u003c/code\u003e.\n\u003ccode\u003eactive-state\u003c/code\u003e holds the necessary folder/files for FitM's operation and the restored snapshot's files.\nThe structure is as follows:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003efd\u003c/code\u003e: files that are used by the process. You will find current output here.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ein\u003c/code\u003e, \u003ccode\u003eout\u003c/code\u003e: afl's \u003ccode\u003ein\u003c/code\u003e/\u003ccode\u003eout\u003c/code\u003e folders.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003enext_snapshot\u003c/code\u003e: populated during \u003ccode\u003ecreate_next_snapshot()\u003c/code\u003e with the files produced by criu. Renamed to snapshot and eventually copied to \u003ccode\u003esaved-states\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eout_postrun\u003c/code\u003e: the content of the \u003ccode\u003eout\u003c/code\u003e folder after fuzzing.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eoutputs\u003c/code\u003e: folder with \"persisted\" outputs. Generally, output is written to files in the \u003ccode\u003efd\u003c/code\u003e folder, but since those files (and the folder) need to be returned to the state they were in before restoring in order to snapshot the next state we collect outputs in an extra step \u003ccode\u003ecreate_outputs()\u003c/code\u003e and store them in the outputs folder.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esnapshot\u003c/code\u003e: serialized process data, i.e. the snapshot. The criu docs are helpful here.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eenvfile\u003c/code\u003e: env for target process. Read by \u003ccode\u003egetenv_from_file()\u003c/code\u003e (see \u003ccode\u003e./fitm-qemu/FitM-qemu/qemuafl/fitm.h\u003c/code\u003e) in QEMU syscall translation layer.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003epipes\u003c/code\u003e: names of forkserver pipes. Needed to reconnect pipes in restored snapshot to pipes from forkserver. Done with the \u003ccode\u003e--inherit-fd\u003c/code\u003e argument in \u003ccode\u003e./active-state/restore.sh\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eprev_input\u003c/code\u003e / \u003ccode\u003eprev_input_path\u003c/code\u003e: input and path to input file that was used to generate current snapshot.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003erestore.log\u003c/code\u003e: criu output of the snapshot restore process.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003erun-info\u003c/code\u003e: serialized FITMSnapshot object for the active state. Helps to know where you are.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esnapshot_map\u003c/code\u003e: afl-map output for the snapshot with prev_input.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003estdout\u003c/code\u003e/\u003ccode\u003estderr\u003c/code\u003e: stdout/err of the target process.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003estdout-afl\u003c/code\u003e/\u003ccode\u003estderr-afl\u003c/code\u003e: stdout/err from the AFL process.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eEach folder in \u003ccode\u003esaved-states\u003c/code\u003e represents one snapshot plus FitM-related files. Some of the files, e.g. \u003ccode\u003epipes\u003c/code\u003e, related to each snapshot are specific to the snapshots state and thus have to be managed for every state.\nIn general, criu breaks very quickly if a process had a handle to a file while it ran, but the file changes (contents, path, size, metadata) in any way between snapshot and restore.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eApart from the above three folder you will find the following temporary files in the repo's root folder after running FitM:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003ecriu_stdout\u003c/code\u003e/\u003ccode\u003ecriu_stderr\u003c/code\u003e: stdout/err of the criu server process. To create snapshots each target process communicates with a separate criu process, the criu server.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003efdinfo\u003c/code\u003e, \u003ccode\u003efile\u003c/code\u003e: Criu has a tool called \"crit\" that can be used to parse the binary files that are part of a snapshot folder. We use crit to parse the open files in the target process and attach them accordingly. The parsing code can be found in \u003ccode\u003ecreate_restore.py\u003c/code\u003e. This script create a bash script \u003ccode\u003erestore.sh\u003c/code\u003e based on the \u003ccode\u003erestore.sh.tmp\u003c/code\u003e template for each state. The \u003ccode\u003erestore.sh\u003c/code\u003e script is the target given to AFL when starting another fuzz run. The script will call \u003ccode\u003ecriu restore\u003c/code\u003e and by using the \u003ca href=\"https://criu.org/Tree_after_restore#Detached\" rel=\"nofollow\"\u003e--restore-detached\u003c/a\u003e flag we make sure that the target process ends up as a child of AFL after criu has exited.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSpecial Files\u003c/h2\u003e\u003ca id=\"user-content-special-files\" class=\"anchor\" aria-label=\"Permalink: Special Files\" href=\"#special-files\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003efitm-args.json\u003c/h3\u003e\u003ca id=\"user-content-fitm-argsjson\" class=\"anchor\" aria-label=\"Permalink: fitm-args.json\" href=\"#fitm-argsjson\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis file is used to configure FitM. The meaning of each key is as follows:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eclient\u003c/code\u003e: path to the binary that should be gen0.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eclient_args\u003c/code\u003e: command-line arguments for the client binary.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eclient_envs\u003c/code\u003e: environment variables that will be available to the client binary.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eclient_files\u003c/code\u003e: currently unused.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eserver\u003c/code\u003e: path to the binary that should be gen1.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eserver_args\u003c/code\u003e: command-line arguments for the server binary.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eserver_envs\u003c/code\u003e: environment variables that will be available to the server binary.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eserver_files\u003c/code\u003e: currently unused.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003erun_time\u003c/code\u003e: time spent fuzzing each generation in seconds.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eserver_only\u003c/code\u003e: boolean to indicate that we only want to fuzz the server. The client is only fuzzed for 100ms and it's output is disregarded.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003efitm-state.json\u003c/h3\u003e\u003ca id=\"user-content-fitm-statejson\" class=\"anchor\" aria-label=\"Permalink: fitm-state.json\" href=\"#fitm-statejson\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA JSON file used to save state information from previous runs. This allows us to abort fuzzing at any point, introduce changes and then reuse the accumulated states in \u003ccode\u003e./saved-states\u003c/code\u003e. The file holds a serialized form of the \u003ccode\u003egeneration_snaps\u003c/code\u003e variable. This variable holds a list of generations that need to be fuzzed, each generation being another list of \u003ccode\u003eFITMSnapshot\u003c/code\u003e objects (\u003ccode\u003e[[gen0_snap0, gen0_snap1, .., gen0_snapN], [gen1_snap0, .. gen1_snapN], .., [genN_snap0, .., genN_snapN]]\u003c/code\u003e).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDebugging\u003c/h2\u003e\u003ca id=\"user-content-debugging\" class=\"anchor\" aria-label=\"Permalink: Debugging\" href=\"#debugging\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen using FitM with a new target you will probably investigate weird behaviour sooner or later.\nYou will generally want to check \u003ccode\u003e./active-state/restore.log\u003c/code\u003e and see the log end with a message similar to this one:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"(00.052019) Running pre-resume scripts\n(00.052043) Restore finished successfully. Tasks resumed.\n(00.052062) Writing stats\n(00.052705) Running post-resume scripts\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e(00.052019) Running pre-resume scripts\n(00.052043) Restore finished successfully. Tasks resumed.\n(00.052062) Writing stats\n(00.052705) Running post-resume scripts\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAt this point you know that the target was successfully restored by criu and any further fails come from the target misbehaving.\nYou will want to check \u003ccode\u003e./active-state/stdout\u003c/code\u003e for the target's stdout, in case you are doing printf-debugging.\nWhen you set the \u003ccode\u003eFITM_DEBUG\u003c/code\u003e macro to 1 you will find a lot of debug prints there that might give you a first idea of where things are breaking.\nNext, you can add \u003ccode\u003eQEMU_STRACE\u003c/code\u003e with a value of 1 to the \u003ccode\u003eclient_envs\u003c/code\u003e/\u003ccode\u003eserver_envs\u003c/code\u003e in your fitm-args.json to get strace output from QEMU.\nYou will see the strace output in \u003ccode\u003e./active-state/stderr\u003c/code\u003e. These are the syscalls that the emulated target sends to emulation layer.\nBy diffing the syscall traces of the target with and without FITM enabled you should be able to learn where things break (see \u003ccode\u003eFITM_DISABLED\u003c/code\u003e in \u003ccode\u003e./fitm-qemu/FitM-qemu/linux-user/syscall.c\u003c/code\u003e).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePaper / Citing / More Information\u003c/h2\u003e\u003ca id=\"user-content-paper--citing--more-information\" class=\"anchor\" aria-label=\"Permalink: Paper / Citing / More Information\" href=\"#paper--citing--more-information\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"/fgsect/FitM/blob/main/fitm.pdf\"\u003e \u003cimg width=\"200\" alt=\"The FitM paper\" src=\"https://user-images.githubusercontent.com/297744/159168821-993d1f88-cc7d-48b0-a0e8-2522b035f789.png\" align=\"right\" style=\"max-width: 100%;\"\u003e \u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor further details, see \u003ca href=\"/fgsect/FitM/blob/main/fitm.pdf\"\u003eour paper\u003c/a\u003e at BAR 2022.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo cite, use:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-bibtex notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"@InProceedings{fitm,\n title = {FitM: Binary-Only Coverage-Guided Fuzzing for Stateful Network Protocols},\n author = {Maier, Dominik and Bittner, Otto and Munier, Marc and Beier, Julian},\n booktitle = {Workshop on Binary Analysis Research (BAR), 2022},\n year = 2022,\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003e@InProceedings\u003c/span\u003e{\u003cspan class=\"pl-en\"\u003efitm\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003etitle\u003c/span\u003e = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e{\u003c/span\u003eFitM: Binary-Only Coverage-Guided Fuzzing for Stateful Network Protocols\u003cspan class=\"pl-pds\"\u003e}\u003c/span\u003e\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003eauthor\u003c/span\u003e = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e{\u003c/span\u003eMaier, Dominik and Bittner, Otto and Munier, Marc and Beier, Julian\u003cspan class=\"pl-pds\"\u003e}\u003c/span\u003e\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003ebooktitle\u003c/span\u003e = \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e{\u003c/span\u003eWorkshop on Binary Analysis Research (BAR), 2022\u003cspan class=\"pl-pds\"\u003e}\u003c/span\u003e\u003c/span\u003e,\n \u003cspan class=\"pl-s\"\u003eyear\u003c/span\u003e = \u003cspan class=\"pl-c1\"\u003e2022\u003c/span\u003e,\n}\u003c/pre\u003e\u003c/div\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"FitM, the Fuzzer in the Middle","anchor":"fitm-the-fuzzer-in-the-middle","htmlText":"FitM, the Fuzzer in the Middle"},{"level":2,"text":"How it works","anchor":"how-it-works","htmlText":"How it works"},{"level":2,"text":"Getting Started","anchor":"getting-started","htmlText":"Getting Started"},{"level":2,"text":"Building","anchor":"building","htmlText":"Building"},{"level":2,"text":"Running","anchor":"running","htmlText":"Running"},{"level":2,"text":"Special Files","anchor":"special-files","htmlText":"Special Files"},{"level":3,"text":"fitm-args.json","anchor":"fitm-argsjson","htmlText":"fitm-args.json"},{"level":3,"text":"fitm-state.json","anchor":"fitm-statejson","htmlText":"fitm-state.json"},{"level":2,"text":"Debugging","anchor":"debugging","htmlText":"Debugging"},{"level":2,"text":"Paper / Citing / More Information","anchor":"paper--citing--more-information","htmlText":"Paper / Citing / More Information"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Ffgsect%2FFitM"}},{"displayName":"LICENSE","repoName":"FitM","refName":"main","path":"LICENSE","preferredFileType":"license","tabName":"MIT","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Ffgsect%2FFitM"}}],"overviewFilesProcessingTime":0}},"appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-7d7eb7c71814.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-708ec8ade250.js","githubDevUrl":null,"enabled_features":{"copilot_workspace":null,"code_nav_ui_events":false,"overview_shared_code_dropdown_button":true,"react_blob_overlay":false,"accessible_code_button":true,"github_models_repo_integration":false}}}}</script> <div data-target="react-partial.reactRoot"><style data-styled="true" 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ScreenReaderHeading-module__userSelectNone--vW4Cq prc-Heading-Heading-6CmGO" data-testid="screen-reader-heading" id="folders-and-files">Folders and files</h2><table aria-labelledby="folders-and-files" class="Box-sc-g0xbh4-0 fdROMU"><thead class="Box-sc-g0xbh4-0 jGKpsv"><tr class="Box-sc-g0xbh4-0 jdgHnn"><th colSpan="2" class="Box-sc-g0xbh4-0 bQivRW"><span class="text-bold">Name</span></th><th colSpan="1" class="Box-sc-g0xbh4-0 ldkMIO"><span class="text-bold">Name</span></th><th class="hide-sm"><div title="Last commit message" class="Truncate__StyledTruncate-sc-23o1d2-0 liVpTx width-fit"><span class="text-bold">Last commit message</span></div></th><th colSpan="1" class="Box-sc-g0xbh4-0 jMbWeI"><div title="Last commit date" class="Truncate__StyledTruncate-sc-23o1d2-0 liVpTx width-fit"><span class="text-bold">Last commit date</span></div></th></tr></thead><tbody><tr class="Box-sc-g0xbh4-0 gpqjiB"><td colSpan="3" class="bgColor-muted p-1 rounded-top-2"><div class="Box-sc-g0xbh4-0 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href="/fgsect/FitM/tree/main/.vscode">.vscode</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-3"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-submodule icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M0 2.75C0 1.784.784 1 1.75 1H5c.55 0 1.07.26 1.4.7l.9 1.2a.25.25 0 0 0 .2.1h6.75c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0 1 14.25 15H1.75A1.75 1.75 0 0 1 0 13.25Zm9.42 9.36 2.883-2.677a.25.25 0 0 0 0-.366L9.42 6.39a.249.249 0 0 0-.42.183V8.5H4.75a.75.75 0 0 0 0 1.5H9v1.927c0 .218.26.331.42.183Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="AFLplusplus" aria-label="AFLplusplus, (Submodule)" class="Link--primary" href="/AFLplusplus/AFLplusplus/tree/84a99f49b84b5380b9b2d79354bd9892216b180d"><span style="color:var(--fgColor-accent, var(--color-accent-fg))">AFLplusplus @ 84a99f4</span></a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-submodule icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M0 2.75C0 1.784.784 1 1.75 1H5c.55 0 1.07.26 1.4.7l.9 1.2a.25.25 0 0 0 .2.1h6.75c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0 1 14.25 15H1.75A1.75 1.75 0 0 1 0 13.25Zm9.42 9.36 2.883-2.677a.25.25 0 0 0 0-.366L9.42 6.39a.249.249 0 0 0-.42.183V8.5H4.75a.75.75 0 0 0 0 1.5H9v1.927c0 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style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="config" aria-label="config, (Directory)" class="Link--primary" href="/fgsect/FitM/tree/main/config">config</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 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1.75 0 0 1 14.25 15H1.75A1.75 1.75 0 0 1 0 13.25Zm9.42 9.36 2.883-2.677a.25.25 0 0 0 0-.366L9.42 6.39a.249.249 0 0 0-.42.183V8.5H4.75a.75.75 0 0 0 0 1.5H9v1.927c0 .218.26.331.42.183Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="criu" aria-label="criu, (Submodule)" class="Link--primary" href="/checkpoint-restore/criu/tree/0d691acbae8eaf912da5c3a8a27ceb7403f6b6da"><span style="color:var(--fgColor-accent, var(--color-accent-fg))">criu @ 0d691ac</span></a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-submodule icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M0 2.75C0 1.784.784 1 1.75 1H5c.55 0 1.07.26 1.4.7l.9 1.2a.25.25 0 0 0 .2.1h6.75c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0 1 14.25 15H1.75A1.75 1.75 0 0 1 0 13.25Zm9.42 9.36 2.883-2.677a.25.25 0 0 0 0-.366L9.42 6.39a.249.249 0 0 0-.42.183V8.5H4.75a.75.75 0 0 0 0 1.5H9v1.927c0 .218.26.331.42.183Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="criu" aria-label="criu, (Submodule)" class="Link--primary" href="/checkpoint-restore/criu/tree/0d691acbae8eaf912da5c3a8a27ceb7403f6b6da"><span style="color:var(--fgColor-accent, var(--color-accent-fg))">criu @ 0d691ac</span></a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-6"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon 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focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="This path skips through empty directories" aria-label="debug/namespacing, (Directory)" class="Link--primary" href="/fgsect/FitM/tree/main/debug/namespacing"><span class="react-directory-default-color" data-testid="path-name-segment">debug/</span><span class="" data-testid="path-name-segment">namespacing</span></a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton 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class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="fitm-qemu" aria-label="fitm-qemu, (Directory)" class="Link--primary" href="/fgsect/FitM/tree/main/fitm-qemu">fitm-qemu</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-8"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="misc" aria-label="misc, (Directory)" class="Link--primary" href="/fgsect/FitM/tree/main/misc">misc</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="misc" aria-label="misc, (Directory)" class="Link--primary" href="/fgsect/FitM/tree/main/misc">misc</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-9"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon 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dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">FitM, the Fuzzer in the Middle</h1><a id="user-content-fitm-the-fuzzer-in-the-middle" class="anchor" aria-label="Permalink: FitM, the Fuzzer in the Middle" href="#fitm-the-fuzzer-in-the-middle"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p align="center" dir="auto"> <a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/22647728/158073817-5ed845b2-46ea-4ce9-8ae3-4103b30653f6.gif"><img width="460" height="300" src="https://user-images.githubusercontent.com/22647728/158073817-5ed845b2-46ea-4ce9-8ae3-4103b30653f6.gif" data-animated-image="" style="max-width: 100%;"></a> </p> <p dir="auto">FitM, the Fuzzer-in-the-Middle, is a AFL++-based coverage-guided fuzzer for stateful, binary-only client-server applications. It can be used in situations where you would normally turn to grammar-based fuzzers or start patching your target. With FitM you can explore the communication between client and server by fuzzing them at the same time. It builds on top of <a href="https://github.com/AFLplusplus/qemuafl">qemuafl</a> for emulation and <a href="https://criu.org/Main_Page" rel="nofollow">CRIU</a> for userspace snapshots. No source code needed!</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">How it works</h2><a id="user-content-how-it-works" class="anchor" aria-label="Permalink: How it works" href="#how-it-works"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The FitM tool uses <a href="https://github.com/fgsect/FitM-qemu">FitM-qemu</a> for instrumentation. FitM-qemu extends qemuafl with a network emulation layer on the syscall level. With it, we can fuzz two targets (binary A & B) at the same time, usually a server and a client and schedule different snapshots of these processes ("generations") we collect while exploring the protocol. Each generation represents a stage in the protocol's communication levels that the client-server pair speaks. The fuzzer starts in generation 0 with binary A. This binary should produce some output without needing any input. Using the initial output of binary A as seed, FitM will fuzz binary B for a while. Afterwards, FitM creates a set of new snapshots of B, generation 3, for later. Next, the snapshot of generation 0 (binary A) is restored, seeded with generation 1's output and fuzzed (generation 2). A snapshot is always created during a receive call that followed a send call until we fully explore the client-server interaction. The below figure depicts this cycle.</p> <p align="center" dir="auto"> <a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/297744/159170739-f8d8d551-e42f-4c76-ae62-902d44b86026.svg"><img width="400" alt="Overview over the different stages of FitM, see paper" src="https://user-images.githubusercontent.com/297744/159170739-f8d8d551-e42f-4c76-ae62-902d44b86026.svg" align="center" style="max-width: 100%;"></a> </p> <p dir="auto">See <a href="/fgsect/FitM/blob/main/fitm.pdf">our paper</a> for technical explanations, benchmarks, and further details.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Getting Started</h2><a id="user-content-getting-started" class="anchor" aria-label="Permalink: Getting Started" href="#getting-started"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This module uses submodules. Clone with <code>--recurse-submodules</code>.</p> <p dir="auto">Alternatively, run the following after cloning:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="git submodule init git submodule update"><pre class="notranslate"><code>git submodule init git submodule update </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Building</h2><a id="user-content-building" class="anchor" aria-label="Permalink: Building" href="#building"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="vagrant up vagrant ssh cd /vagrant make"><pre class="notranslate"><code>vagrant up vagrant ssh cd /vagrant make </code></pre></div> <p dir="auto">If you don't want to use the provided Vagrantfile you can read the provided <code>provision.sh</code> script to understand the necessary dependencies. In general you will need packages to build <a href="https://github.com/AFLplusplus/qemuafl/blob/master/README.rst">QEMU</a> and <a href="https://criu.org/Installation#Installing_build_dependencies" rel="nofollow">Criu</a>. Additionally, you will need a stable <a href="https://www.rust-lang.org/tools/install" rel="nofollow">rust toolchain</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Running</h2><a id="user-content-running" class="anchor" aria-label="Permalink: Running" href="#running"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Run this: <code>FITM_ARGS=config/fitm-args.ftp.json make run</code></p> <p dir="auto">The fuzzer will create the folders <code>active-state</code>, <code>saved-states</code> and <code>cmin-tmp</code>. Whenever afl-cmin is used the inputs that should be fed into cmin are put into <code>cmin-tmp</code>. <code>active-state</code> holds the necessary folder/files for FitM's operation and the restored snapshot's files. The structure is as follows:</p> <ul dir="auto"> <li><code>fd</code>: files that are used by the process. You will find current output here.</li> <li><code>in</code>, <code>out</code>: afl's <code>in</code>/<code>out</code> folders.</li> <li><code>next_snapshot</code>: populated during <code>create_next_snapshot()</code> with the files produced by criu. Renamed to snapshot and eventually copied to <code>saved-states</code>.</li> <li><code>out_postrun</code>: the content of the <code>out</code> folder after fuzzing.</li> <li><code>outputs</code>: folder with "persisted" outputs. Generally, output is written to files in the <code>fd</code> folder, but since those files (and the folder) need to be returned to the state they were in before restoring in order to snapshot the next state we collect outputs in an extra step <code>create_outputs()</code> and store them in the outputs folder.</li> <li><code>snapshot</code>: serialized process data, i.e. the snapshot. The criu docs are helpful here.</li> <li><code>envfile</code>: env for target process. Read by <code>getenv_from_file()</code> (see <code>./fitm-qemu/FitM-qemu/qemuafl/fitm.h</code>) in QEMU syscall translation layer.</li> <li><code>pipes</code>: names of forkserver pipes. Needed to reconnect pipes in restored snapshot to pipes from forkserver. Done with the <code>--inherit-fd</code> argument in <code>./active-state/restore.sh</code>.</li> <li><code>prev_input</code> / <code>prev_input_path</code>: input and path to input file that was used to generate current snapshot.</li> <li><code>restore.log</code>: criu output of the snapshot restore process.</li> <li><code>run-info</code>: serialized FITMSnapshot object for the active state. Helps to know where you are.</li> <li><code>snapshot_map</code>: afl-map output for the snapshot with prev_input.</li> <li><code>stdout</code>/<code>stderr</code>: stdout/err of the target process.</li> <li><code>stdout-afl</code>/<code>stderr-afl</code>: stdout/err from the AFL process.</li> </ul> <p dir="auto">Each folder in <code>saved-states</code> represents one snapshot plus FitM-related files. Some of the files, e.g. <code>pipes</code>, related to each snapshot are specific to the snapshots state and thus have to be managed for every state. In general, criu breaks very quickly if a process had a handle to a file while it ran, but the file changes (contents, path, size, metadata) in any way between snapshot and restore.</p> <p dir="auto">Apart from the above three folder you will find the following temporary files in the repo's root folder after running FitM:</p> <ul dir="auto"> <li><code>criu_stdout</code>/<code>criu_stderr</code>: stdout/err of the criu server process. To create snapshots each target process communicates with a separate criu process, the criu server.</li> <li><code>fdinfo</code>, <code>file</code>: Criu has a tool called "crit" that can be used to parse the binary files that are part of a snapshot folder. We use crit to parse the open files in the target process and attach them accordingly. The parsing code can be found in <code>create_restore.py</code>. This script create a bash script <code>restore.sh</code> based on the <code>restore.sh.tmp</code> template for each state. The <code>restore.sh</code> script is the target given to AFL when starting another fuzz run. The script will call <code>criu restore</code> and by using the <a href="https://criu.org/Tree_after_restore#Detached" rel="nofollow">--restore-detached</a> flag we make sure that the target process ends up as a child of AFL after criu has exited.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Special Files</h2><a id="user-content-special-files" class="anchor" aria-label="Permalink: Special Files" href="#special-files"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">fitm-args.json</h3><a id="user-content-fitm-argsjson" class="anchor" aria-label="Permalink: fitm-args.json" href="#fitm-argsjson"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This file is used to configure FitM. The meaning of each key is as follows:</p> <ul dir="auto"> <li><code>client</code>: path to the binary that should be gen0.</li> <li><code>client_args</code>: command-line arguments for the client binary.</li> <li><code>client_envs</code>: environment variables that will be available to the client binary.</li> <li><code>client_files</code>: currently unused.</li> <li><code>server</code>: path to the binary that should be gen1.</li> <li><code>server_args</code>: command-line arguments for the server binary.</li> <li><code>server_envs</code>: environment variables that will be available to the server binary.</li> <li><code>server_files</code>: currently unused.</li> <li><code>run_time</code>: time spent fuzzing each generation in seconds.</li> <li><code>server_only</code>: boolean to indicate that we only want to fuzz the server. The client is only fuzzed for 100ms and it's output is disregarded.</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">fitm-state.json</h3><a id="user-content-fitm-statejson" class="anchor" aria-label="Permalink: fitm-state.json" href="#fitm-statejson"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A JSON file used to save state information from previous runs. This allows us to abort fuzzing at any point, introduce changes and then reuse the accumulated states in <code>./saved-states</code>. The file holds a serialized form of the <code>generation_snaps</code> variable. This variable holds a list of generations that need to be fuzzed, each generation being another list of <code>FITMSnapshot</code> objects (<code>[[gen0_snap0, gen0_snap1, .., gen0_snapN], [gen1_snap0, .. gen1_snapN], .., [genN_snap0, .., genN_snapN]]</code>).</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Debugging</h2><a id="user-content-debugging" class="anchor" aria-label="Permalink: Debugging" href="#debugging"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When using FitM with a new target you will probably investigate weird behaviour sooner or later. You will generally want to check <code>./active-state/restore.log</code> and see the log end with a message similar to this one:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="(00.052019) Running pre-resume scripts (00.052043) Restore finished successfully. Tasks resumed. (00.052062) Writing stats (00.052705) Running post-resume scripts"><pre class="notranslate"><code>(00.052019) Running pre-resume scripts (00.052043) Restore finished successfully. Tasks resumed. (00.052062) Writing stats (00.052705) Running post-resume scripts </code></pre></div> <p dir="auto">At this point you know that the target was successfully restored by criu and any further fails come from the target misbehaving. You will want to check <code>./active-state/stdout</code> for the target's stdout, in case you are doing printf-debugging. When you set the <code>FITM_DEBUG</code> macro to 1 you will find a lot of debug prints there that might give you a first idea of where things are breaking. Next, you can add <code>QEMU_STRACE</code> with a value of 1 to the <code>client_envs</code>/<code>server_envs</code> in your fitm-args.json to get strace output from QEMU. You will see the strace output in <code>./active-state/stderr</code>. These are the syscalls that the emulated target sends to emulation layer. By diffing the syscall traces of the target with and without FITM enabled you should be able to learn where things break (see <code>FITM_DISABLED</code> in <code>./fitm-qemu/FitM-qemu/linux-user/syscall.c</code>).</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Paper / Citing / More Information</h2><a id="user-content-paper--citing--more-information" class="anchor" aria-label="Permalink: Paper / Citing / More Information" href="#paper--citing--more-information"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="/fgsect/FitM/blob/main/fitm.pdf"> <img width="200" alt="The FitM paper" src="https://user-images.githubusercontent.com/297744/159168821-993d1f88-cc7d-48b0-a0e8-2522b035f789.png" align="right" style="max-width: 100%;"> </a></p> <p dir="auto">For further details, see <a href="/fgsect/FitM/blob/main/fitm.pdf">our paper</a> at BAR 2022.</p> <p dir="auto">To cite, use:</p> <div class="highlight highlight-text-bibtex notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="@InProceedings{fitm, title = {FitM: Binary-Only Coverage-Guided Fuzzing for Stateful Network Protocols}, author = {Maier, Dominik and Bittner, Otto and Munier, Marc and Beier, Julian}, booktitle = {Workshop on Binary Analysis Research (BAR), 2022}, year = 2022, }"><pre><span class="pl-k">@InProceedings</span>{<span class="pl-en">fitm</span>, <span class="pl-s">title</span> = <span class="pl-s"><span class="pl-pds">{</span>FitM: Binary-Only Coverage-Guided Fuzzing for Stateful Network Protocols<span class="pl-pds">}</span></span>, <span class="pl-s">author</span> = <span class="pl-s"><span class="pl-pds">{</span>Maier, Dominik and Bittner, Otto and Munier, Marc and Beier, Julian<span class="pl-pds">}</span></span>, <span class="pl-s">booktitle</span> = <span class="pl-s"><span class="pl-pds">{</span>Workshop on Binary Analysis Research (BAR), 2022<span class="pl-pds">}</span></span>, <span class="pl-s">year</span> = <span class="pl-c1">2022</span>, }</pre></div> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="mcfmuq0DKLS4NNOp3G5JHTTCKFVZepT4YzqFDesYk0LYK6Z4GORiGBE18n4UY0FOQ5QhlDVfBubrlr2cgvhfPQ==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> FitM, the Fuzzer in the Middle, can fuzz client and server binaries at the same time using userspace snapshot-fuzzing and network emulation. 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