CNAME Cloaking – die Zukunft des Tracking?

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px-1">></span> <span class="breadcrumb_last" aria-current="page">CNAME Cloaking – die Zukunft des Tracking?</span></span></li></ol></nav></div> <div class="row"> <main id="primary" class="dd-primary col-xxl-8 pe-md-3 pe-lg-6"> <article id="post-46782" class="post-46782 post type-post status-publish format-standard has-post-thumbnail hentry category-marketing tag-ad-tracking tag-fingerprinting tag-tracking tag-usertracking tag-webtracking beitragsart-fachbeitrag"> <header class="dd-entry-header dd-hero card mb-4"> <div class="d-flex justify-content-end"> <img width="660" height="390" src="https://www.dr-datenschutz.de/wp-content/uploads/2014/04/daten-12.jpg" class="img-fluid wp-post-image" alt="CNAME Cloaking – die Zukunft des Tracking?" decoding="async" fetchpriority="high" srcset="https://www.dr-datenschutz.de/wp-content/uploads/2014/04/daten-12.jpg 660w, https://www.dr-datenschutz.de/wp-content/uploads/2014/04/daten-12-280x165.jpg 280w, 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class="entry-header px-xs2-4"> <button type="button" class="btn btn-outline-light btn-sm text-uppercase" disabled>Fachbeitrag</button> <h1 class="card-title mt-2 text-light">CNAME Cloaking – die Zukunft des Tracking?</h1> <div class="entry-meta"> <p class="card-text"> <span class="byline"> Artikel von <span class="author vcard"><a class="url fn n" href="https://www.dr-datenschutz.de/author/lstoll/">Laura L. Stoll</a></span></span><span class="separator px-1">·</span><span class="posted-on d-inline-block"><a href="https://www.dr-datenschutz.de/cname-cloaking-die-zukunft-des-tracking/" rel="bookmark"><span class="entry-date">10. Juni 2020</span></a></span></p> </div> </div> </div> </header>  <div class="dd-entry-content"> <p>Wer glaubte, dass man nur den richtigen AdBlocker braucht, um seine Ruhe vor nerviger Werbung und Nutzer-Tracking zu haben, hat wahrscheinlich noch nichts von CNAME Cloaking gehört. Diese noch relativ neue Tracking-Methode nimmt immer mehr Raum ein, um den Usern Drittanbieter-Tracker und ungewollte Werbung unterzuschieben. AdBlocker, Browser-Erweiterungen und auch die Browser selbst haben dieser Technologie bisher wenig entgegenzusetzen. AdBlocker vs. Tracker geht in eine neue Runde.<span id="more-46782"></span></p> <div id="toc_container" class="no_bullets"><p class="toc_title">Der Inhalt im Überblick</p><ul class="toc_list"><li><a href="#Was-ist-CNAME-Cloaking">Was ist CNAME Cloaking?</a></li><li><a href="#Was-hilft-gegen-CNAME-Cloaking">Was hilft gegen CNAME Cloaking?</a></li><li><a href="#Die-Zukunft-von-AdBlocker-vs-Tracker">Die Zukunft von AdBlocker vs. Tracker</a></li></ul></div> <h2><span id="Was-ist-CNAME-Cloaking">Was ist CNAME Cloaking?</span></h2> <p>Zunächst muss jedoch geklärt werden, was man unter CNAME Cloaking eigentlich zu verstehen hat.</p> <p>Als Cloaking (zu Deutsch: Verhüllen) versteht man eine Technik, bei der Suchmaschinen beim Zugriff auf eine URL andere Inhalte anzeigt bekommen als die Nutzer selbst. Folglich stellt Cloaking im Regelfall einen Verstoß gegen die Richtlinien von Suchmaschinen dar.</p> <p>Als CNAME (Canonical Name) bzw. <a href="https://ns1.com/resources/cname" target="_blank" rel="noopener noreferrer">CNAME-Record</a> bezeichnet man Einträge im DNS-Zonefile für eine Domain. Normalerweise kann man damit weitere Domains mit der eigentlich, ursprünglichen Domain verknüpften. Dies ist insbesondere vorteilhaft beim IP-Wechsel der Hauptdomain, weil als CNAME eingetragene Domains nicht angepasst werden müssen.</p> <p>In der Kombination versuchen die Tracking- und Werbetreibenden mit CNAME bei AdBlockern und anderen ähnlichen Diensten ihre bekannten Domains zu tarnen. Die Blocker und auch Browser-Addons verwenden nämlich sogenannte „Host Listen“, in denen bekannte Domains von Tracking- und Werbeunternehmen geführt werden. Umso umfänglicher und aktueller die „Host Liste“ ist, desto besser i. S. v. zuverlässig ist die Qualität des Blockers. CNAME Cloaking ermöglicht den Tracking- und Werbefirmen für bereits registrierte Werbe-Domains eine neue CNAME im Domain Namen System (DNS) hinzuzufügen, die dann wiederum nicht in der „Host Liste“ enthalten ist.</p> <p>Mit dieser Technik können den Trackern und der Werbung unendlich häufig neue und zufällige auf DNS basierende Domains zugewiesen werden. Besonders relevant ist dies, weil <a href="https://medium.com/nextdns/cname-cloaking-the-dangerous-disguise-of-third-party-trackers-195205dc522a" target="_blank" rel="noopener noreferrer">reguläre Browsererweiterungen keinen Zugriff auf die DNS-Ebene</a> haben. Hierdurch wird es ihnen unmöglich gemacht die verwendeten CNAMEs zu erkennen. Folglich kann eine Domain auf der „Host Liste“ erfasst sein, der aber dem AdBlocker trotzdem verborgen bleibt.</p> <p>Auch wenn die neu kreierten CNAMEs sukzessive zur „Host Liste“ ergänzt werden, bleibt es dem Werbetreibenden unbenommen seine Domain einfach hinter weiteren neu erstellten CNAMEs zu verstecken. Dieses Katz-und-Maus-Spiel kann quasi unendlich fortgesetzt werden. Außerdem können Firmen durch diese <a href="https://portswigger.net/daily-swig/web-trackers-using-cname-cloaking-to-bypass-browsers-ad-blockers" target="_blank" rel="noopener noreferrer">DNS Cloaking Technik sehr leicht</a> Fingerprinting-Eigenschaften wie IP Adressen, das verwendete Betriebssystem oder auch die Browserversion – ohne abhängig von einem Cookie zu sein – erfassen.</p> <h2><span id="Was-hilft-gegen-CNAME-Cloaking">Was hilft gegen CNAME Cloaking?</span></h2> <p>Da die bekannten AdBlocker gegen diese Technik nicht erfolgreich eingesetzt werden können, ist es fraglich, wie wir unsere Privatsphäre zukünftig gegen CNAME Cloaking schützen können. Bisher gibt es noch keine finalen Lösungen. Trotzdem finden sich anbei zwei Vorstöße, die es sich lohnt zu erproben.</p> <p>Mike Kuketz hat bereits im November 2019 eine Beta-Version von <a href="https://www.kuketz-blog.de/firefox-ublock-origin-firefox-kompendium-teil2/" target="_blank" rel="noopener noreferrer">uBlock Origin</a> vorgestellt, die vor CNAME Cloaking schützen kann. Dafür muss u.a. die jeweils aktuelle Version von uBlock Origin installiert und Firefox als Browser verwendet werden (<a href="https://www.heise.de/newsticker/meldung/Firefox-uBlock-Origin-schuetzt-vor-versteckten-Trackern-4596641.html" target="_blank" rel="noopener noreferrer">aber keine Lösung für Chrome</a>). Weitere notwendige Schritte finden sich detailliert in seinem <a href="https://www.kuketz-blog.de/vorsicht-neue-art-des-trackings-via-cname-cloaking/" target="_blank" rel="noopener noreferrer">Blog</a> und sind nach dem Selbstversuch unsererseits als leicht umsetzbar einzustufen. Dennoch bleibt bei der Verwendung zu bedenken, dass sich die Anwendung in der Erprobungsphase befindet. Auch wenn wir keine Performance-Einschränkungen weder des Browsers noch des Rechners bemerken konnten, kann dies nicht ausgeschlossen werden.</p> <p>Zudem proklamierte NextDNS, dass sie der erste Anbieter seien, die erfolgreich CNAME Cloaking abwehren könnten. In einem Beitrag auf <a href="https://medium.com/nextdns/nextdns-added-cname-uncloaking-support-becomes-the-first-cross-platform-solution-to-the-problem-e3f437f84342" target="_blank" rel="noopener noreferrer">medium.com</a> stellen sie dar, dass ihr AdBlocker entsprechend DNS-basiert agiert und somit auch neue CNAMEs herausfiltern kann. Sollten die Tracking-Unternehmen dennoch die Strategien ändern und gegeben falls anstelle von CNAMEs zukünftig z. Bsp. <a href="https://de.wikipedia.org/wiki/NS_Resource_Record" target="_blank" rel="noopener noreferrer">NS Records</a> verwenden, wäre NextDNS nach eigenen Aussagen auch darauf vorbereitet. Ein Unternehmen und dessen Ideen wir weiter im Auge behalten werden.</p> <h2><span id="Die-Zukunft-von-AdBlocker-vs-Tracker">Die Zukunft von AdBlocker vs. Tracker</span></h2> <p>User müssen daher auch in Zukunft weiter wachsam sein. Die Werbe- und Trackingindustrie schläft nicht und wird weiter versuchen Wege zu finden, um AdBlocker „auszutricksen“. Bei den meisten Usern wird das durch CNAME Cloaking auch noch für eine Weile bestens funktionieren bis Browser-Addons oder die Browser selbst, die sich noch in den Testphasen befindenden Anwendungen, einbinden können. 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Juli 2024</small></div></div></div></li><li><div class="card dd-post dd-post-id-3 mt-1 border-0 rounded-3"><div class="card-body d-flex align-items-center"><div class="dd-card-content"><a class="d-block dd-font-medium text-decoration-none text-black stretched-link" href="https://www.dr-datenschutz.de/was-ist-website-tracking-und-wie-funktioniert-es/">Was ist Website-Tracking und wie funktioniert es?</a><small class="text-muted dd-font-regular">Fachbeitrag<span class="separator px-1">·</span>12. September 2023</small></div></div></div></li></ul><div class="card dd-more-link mt-1 border-0 rounded-3"><div class="card-body"><a class="d-block dd-font-medium text-decoration-none" href="https://www.dr-datenschutz.de/tag/webtracking/"><small class="text-danger">Mehr zum Thema</small></a></div></div></li></ul> </div> <div class="glide-arrows" data-glide-el="controls"> <button class="carousel-control-prev rounded-3" data-glide-dir="<"> <span class="carousel-control-prev-icon" aria-hidden="true"></span> <span class="visually-hidden-focusable overflow-hidden">Previous</span> </button> <button class="carousel-control-next rounded-3" data-glide-dir=">"> <span class="carousel-control-next-icon" aria-hidden="true"></span> <span class="visually-hidden-focusable overflow-hidden">Next</span> </button> </div> </div>  <div id="comments" class="dd-comments mt-5"> <div class="h4 text-primary mb-3 pt-1">Beitrag kommentieren</div>  <div class="dd-anonymous-feedback"> Fehler entdeckt oder Themenvorschlag? Kontaktieren Sie uns anonym <a href="#" data-bs-toggle="modal" data-bs-target="#FeedbackModal">hier</a>. </div>  <div class="accordion dd-accordion-comments mt-1 mb-3" id="accordionComments"> <div class="accordion-item"> <div class="accordion-header h2" id="headingComments"> <div class="accordion-button collapsed position-relative rounded-3" role="button" data-bs-toggle="collapse" data-bs-target="#collapseComments" aria-expanded="true" aria-controls="collapseComments"> <div class="dd-comment-bubble-and-count position-absolute top-0 start-0 bottom-0"> <div class="dd-comment-bubble-comment-count position-absolute top-50 start-50 translate-middle text-light dd-font-20 dd-font-regular">1</div> </div> <span class="dd-button-text-show">Klicken Sie hier, um den Kommentarbereich anzuzeigen.</span> <span class="dd-button-text-hide">Kommentare verbergen.</span> </div> </div> <div id="collapseComments" class="accordion-collapse collapse" aria-labelledby="headingComments" data-bs-parent="#accordionComments" data-my-id="collapse-1"> <div class="accordion-body">  <ul class="dd-comment-list list-unstyled dd-font-regular dd-font-12"> <li id="comment-117058" class="comment even thread-even depth-1"> <div id="dd-div-comment-117058" class="dd-comment-body"> <div class="dd-comment-content"> <p>Leider ist der kostenlose eBlocker (<a href="https://eBlocker.org" target="_blank" rel="noopener noreferrer nofollow ugc">eBlocker.org</a>) nicht als Lösung gegen CNAME-Cloaking genannt.<br /> Bereits bei der Konzeption vor über fünf Jahren haben wir den Tracking Trick bedacht und gelöst. Durch Pattern Matching auf dem TCP/IP Strom werden diese (und viele weitere) trickreichen Tracking-Methoden in Echtzeit erkannt und geblockt. </p> <p>Da eBlocker Open Source ist, kann jeder Interessierte auf github.com/eblocker die technischen Details zur Funktionsweise nachlesen und den Code validieren. Tatsächlich ist uns bis heute kein Anti-Tracking Tool bekannt, das diese Leistung bringt.</p> <p>Ich darf an dieser Stelle anmerken, dass dies keine Schleichwerbung ist, denn eBlocker ist heute kostenlos, wird nur über Spenden finanziert und hat kein verstecktes Business Model. Vielleicht darf ich auch nicht unerwähnt lassen, dass ich vor über 20 Jahren mit etracker.com einen Datenschutz-konformen Tracker gegründet habe – und mich daher etwas in dem Bereich auskenne… ;-)</p> </div> <footer class="dd-comment-meta d-flex"> <div class="dd-comment-metadata flex-grow-1 text-dark"> <span class="fn">Christian Bennefeld (eBlocker Gründer)</span> am <a class="dd-comment-time" href="https://www.dr-datenschutz.de/cname-cloaking-die-zukunft-des-tracking/#comment-117058"> <time datetime="2020-06-11T07:49:30+02:00"> 11. 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rel="nofollow noopener noreferrer" > https://www.dr-datenschutz.de/datenschutzerklaerung/ </a> </td> </tr> <tr> <th scope="row">Host(s)</th> <td>www.dr-datenschutz.de</td> </tr> <tr> <th scope="row">Cookie Name</th> <td>wp-gdrts-log</td> </tr> <tr> <th scope="row">Cookie Laufzeit</th> <td>12 Monate</td> </tr> </table> <table> <tr> <th scope="row">Name</th> <td> <label> VG Wort </label> </td> </tr> <tr> <th scope="row">Anbieter</th> <td>Verwertungsgesellschaft WORT</td> </tr> <tr> <th scope="row">Zweck</th> <td>Messung von Zugriffen auf Texte, um die Kopierwahrscheinlichkeit zu erfassen.</td> </tr> <tr> <th scope="row">Datenschutzerklärung</th> <td class="_brlbs-pp-url"> <a href="https://www.dr-datenschutz.de/datenschutzerklaerung/" target="_blank" rel="nofollow noopener noreferrer" > https://www.dr-datenschutz.de/datenschutzerklaerung/ </a> </td> </tr> <tr> <th scope="row">Host(s)</th> <td>vg07.met.vgwort.de</td> </tr> <tr> <th scope="row">Cookie Name</th> <td>srp</td> </tr> <tr> <th 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