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<!DOCTYPE html>      <html lang="en-US" class="no-js">  <meta charset="UTF-8"> <title>August 2022 | Volexity</title> <meta name="HandheldFriendly" content="True"> <meta name="MobileOptimized" content="320"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="cleartype" content="on"> <meta name="twitter:card" content="summary_large_image"> <meta name="twitter:site" content="@Volexity"> <meta name="twitter:creator" content="@Volexity"> <meta name="twitter:title" content="Mass Exploitation of (Un)authenticated Zimbra RCE: CVE-2022-27925"> <meta name="twitter:description" content="[Note: Volexity has reported all findings in this post to Zimbra. Where an existing contact was known, Volexity has notified local CERTs of compromised Zimbra instances in their constituency. The newest versions of Zimbra are patched for both the RCE vulnerability and authentication bypass vulnerabilities described in this blog.] In July and early August 2022, Volexity worked on multiple incidents where the victim organization experienced serious breaches to their Zimbra Collaboration Suite (ZCS) email servers. Volexity鈥檚 investigations uncovered evidence indicating the likely cause of these breaches was exploitation of CVE-2022-27925, a remote-code-execution (RCE) vulnerability in ZCS. This initial CVE was patched by Zimbra in March 2022 in 8.8.15P31 and 9.0.0P24. Figure 1. Description of CVE-2022-27925 from the NIST website Initial research into the vulnerability did not uncover any public exploit code, but since a patch had been available for several months, it was reasonable that exploit code could have been […]"> <meta name="twitter:image" content="https://www.volexity.com/wp-content/uploads/2022/08/Volexity-Mass-Exploitation-Unauthenticated-Zimbra-RCE-CVE-2022-27925.png"> <link rel="apple-touch-icon" sizes="180x180" href="https://www.volexity.com/wp-content/themes/volexity/apple-touch-icon.png"> <link rel="icon" type="image/png" href="https://www.volexity.com/wp-content/themes/volexity/favicon-32x32.png" sizes="32x32"> <link rel="icon" type="image/png" href="https://www.volexity.com/wp-content/themes/volexity/favicon-16x16.png" sizes="16x16"> <link rel="icon" type="image/png" href="https://www.volexity.com/wp-content/themes/volexity/favicon.ico"> <link rel="manifest" href="https://www.volexity.com/wp-content/themes/volexity/manifest.json"> <meta name="theme-color" content="#12BEF0"> <meta property="og:image" content="https://www.volexity.com/wp-content/uploads/2022/08/Volexity-Mass-Exploitation-Unauthenticated-Zimbra-RCE-CVE-2022-27925-300x157.png" />  <script async src="https://www.googletagmanager.com/gtag/js?id=G-WRSX85NK29"></script> <script> window.dataLayer = window.dataLayer || []; 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class="int-header-hold col-sm-12"> archive </section> </div> </div> <main class="main"> <div class="container"> <div class="row int"> <section class="col-sm-8"> <h4 class="archive-page-title section-header"> Monthly Archives: August, 2022 </h4> <ol class="posts-list alm-reveal"> <li class="post-2613 post type-post status-publish format-standard has-post-thumbnail hentry category-threat-intelligence tag-0day tag-cve-2022-27925 tag-exploit tag-webshell tag-zimbra authortax-volexity-threat-research" id="post-2613" data-url="https://www.volexity.com/blog/2022/08/10/mass-exploitation-of-unauthenticated-zimbra-rce-cve-2022-27925/" data-title="Mass Exploitation of (Un)authenticated Zimbra RCE: CVE-2022-27925"> <h2 class="post-title"><a href="https://www.volexity.com/blog/2022/08/10/mass-exploitation-of-unauthenticated-zimbra-rce-cve-2022-27925/">Mass Exploitation of (Un)authenticated Zimbra RCE: CVE-2022-27925</a></h2> <p class="post-date">August 10, 2022</p> <p class="post-byline">by Volexity Threat Research </p> <div class="post-content post-excerpt composition"><p>[Note: Volexity has reported all findings in this post to Zimbra. Where an existing contact was known, Volexity has notified local CERTs of compromised Zimbra instances in their constituency. The newest versions of Zimbra are patched for both the RCE vulnerability and authentication bypass vulnerabilities described in this blog.] In July and early August 2022, Volexity worked on multiple incidents where the victim organization experienced serious breaches to their Zimbra Collaboration Suite (ZCS) email servers. Volexity鈥檚 investigations uncovered evidence indicating the likely cause of these breaches was exploitation of CVE-2022-27925, a remote-code-execution (RCE) vulnerability in ZCS. This initial CVE was patched by Zimbra in March 2022 in 8.8.15P31 and 9.0.0P24. Figure 1. Description of CVE-2022-27925 from the NIST website Initial research into the vulnerability did not uncover any public exploit code, but since a patch had been available for several months, it was reasonable that exploit code could have been […]</p> </div> <div class="blog-cta-contain"> <a class="box-cta" href="https://www.volexity.com/blog/2022/08/10/mass-exploitation-of-unauthenticated-zimbra-rce-cve-2022-27925/">Read More</a> </div> </li> </ol> <div class="pagination"> <div class="pagination-prev"></div> <div class="pagination-next"></div> </div> </section> <aside class="sidebar col-sm-4"> <ul class="widgets"> <li class="widget widget_search"><div class="widget-content"><form role="search" method="get" class="search-form" action="https://www.volexity.com/"> <label> <span class="screen-reader-text">Search for:</span> <input type="search" class="search-field" placeholder="SEARCH" value="" name="s" title="Search for:" /> </label> <input type="submit" class="search-submit" 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