{"id":53107,"date":"2019-11-24T00:00:00","date_gmt":"2019-11-23T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc"},"modified":"2020-02-18T14:00:58","modified_gmt":"2020-02-18T11:00:58","slug":"37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/news\/37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc","title":{"rendered":"37 Schwachstellen in verschiedenen Implementierungen von VNC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Pawel Tscheremuskin von der Kaspersky-Labor <noindex><a rel=\"nofollow\" href=\"https:\/\/ics-cert.kaspersky.ru\/reports\/2019\/11\/13\/vnc-vulnerability-research\/\">hat analysiert<\/a><\/noindex> verschiedene Implementierungen des VNC-Systems (Virtual Network Computing) und 37 Schwachstellen aufgedeckt, die durch Probleme beim Umgang mit dem Speicher verursacht wurden. Die in den VNC-Server-Implementierungen identifizierten Schwachstellen k\u00f6nnen nur von authentifizierten Benutzern ausgenutzt werden, w\u00e4hrend Angriffe auf Schwachstellen im Client-Code m\u00f6glich sind, sobald ein Benutzer mit einem vom Angreifer kontrollierten Server verbunden ist.<\/p>\n<p>Die meisten Schwachstellen wurden im Paket <noindex><a rel=\"nofollow\" href=\"https:\/\/www.uvnc.com\/\">UltraVNC<\/a><\/noindex>entdeckt, das nur f\u00fcr die Windows-Plattform verf\u00fcgbar ist. Insgesamt wurden in UltraVNC 22 Schwachstellen identifiziert. 13 Schwachstellen k\u00f6nnen potenziell zur Ausf\u00fchrung von Code im System f\u00fchren, 5 zur Offenlegung von Inhalten im Speicher und 4 zu einem Dienstausfall.<br \/>\nDie Schwachstellen wurden in der Version <noindex><a rel=\"nofollow\" href=\"https:\/\/www.uvnc.com\/downloads\/ultravnc.html\">1.2.3.0<\/a><\/noindex>.<\/p>\n<p>In der offenen Bibliothek <noindex><a rel=\"nofollow\" href=\"http:\/\/libvnc.github.io\/\">LibVNC<\/a><\/noindex> (LibVNCServer und LibVNCClient), die <noindex><a rel=\"nofollow\" href=\"http:\/\/libvnc.github.io\/success.html\">wird verwendet<\/a><\/noindex> in VirtualBox entdeckt wurden, wurden 10 Schwachstellen identifiziert.<br \/>\n5 Schwachstellen (<noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-20020\">CVE-2018-20020<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-20019\">CVE-2018-20019<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-15127\">CVE-2018-15127<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-15126\">CVE-2018-15126<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2018-6307\">CVE-2018-6307<\/a><\/noindex>) resultieren aus Puffer\u00fcberl\u00e4ufen und k\u00f6nnen potenziell zur Ausf\u00fchrung von Code f\u00fchren. 3 Schwachstellen k\u00f6nnen zu einer Informationsleckage f\u00fchren, 2 zu einem Dienstausfall.<br \/>\nAlle Probleme wurden bereits von den Entwicklern behoben, aber die \u00c4nderungen sind bisher <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/LibVNC\/libvncserver\/commit\/6073771eed1caf72f196e410182471e0dfd32149\">nur in dem Master-Zweig reflektiert.<\/a><\/noindex> TightVNC<\/p>\n<p>Im  <noindex><a rel=\"nofollow\" href=\"https:\/\/sourceforge.net\/projects\/vnc-tight\/\">(eine veraltete plattform\u00fcbergreifende Version wurde getestet, da die aktuelle Version 2.x nur f\u00fcr Windows herausgegeben wird), wurden 4 Schwachstellen gefunden. Drei Probleme (<\/a><\/noindex> CVE-2019-15679 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.tightvnc.com\/download-old.php\">1.3<\/a><\/noindex>CVE-2019-15678<noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=2019-15679\">CVE-2019-8287<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=2019-15678\">) sind auf Puffer\u00fcberl\u00e4ufe in den Funktionen InitialiseRFBConnection, rfbServerCutText und HandleCoRREBBP zur\u00fcckzuf\u00fchren und k\u00f6nnten potenziell zur Ausf\u00fchrung von Code f\u00fchren. Ein Problem (<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2019-8287\">CVE-2019-15680<\/a><\/noindex>) f\u00fchrt zu einem Dienstausfall. Obwohl die Entwickler von TightVNC<noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=2019-15680\">schon im vergangenen Jahr auf die Probleme hingewiesen wurden, sind die Schwachstellen weiterhin ungepatcht.<\/a><\/noindex>Im plattform\u00fcbergreifenden Paket <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2018\/12\/10\/5\">benachrichtigt<\/a><\/noindex> TurboVNC<\/p>\n<p>(ein Fork von TightVNC 1.3, das die libjpeg-turbo-Bibliothek verwendet), wurde nur eine Schwachstelle ( <noindex><a rel=\"nofollow\" href=\"https:\/\/www.turbovnc.org\/\">CVE-2019-15683<\/a><\/noindex> ) gefunden, die jedoch gef\u00e4hrlich ist und bei vorhandenem authentifiziertem Zugriff auf den Server die Ausf\u00fchrung eigenen Codes erm\u00f6glicht, da bei einem Puffer\u00fcberlauf die R\u00fccksprungadresse kontrolliert werden kann. Das Problem wurde<noindex><a rel=\"nofollow\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=2019-15683\">am 23. August<\/a><\/noindex>behoben und tritt nicht mehr in der aktuellen Version auf. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/TurboVNC\/turbovnc\/commit\/cea98166008301e614e0d36776bf9435a536136e\">Pawel Tscheremuskin von der Kaspersky-Labor hat verschiedene Implementierungen des Systems analysiert.<\/a><\/noindex> und zeigt sich nicht in der aktuellen Ausgabe <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/TurboVNC\/turbovnc\/releases\">2.2.3<\/a><\/noindex>.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Quelle: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51922\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0430\u0432\u0435\u043b \u0427\u0435\u0440\u0435\u043c\u0443\u0448\u043a\u0438\u043d \u0438\u0437 \u041b\u0430\u0431\u043e\u0440\u0430\u0442\u043e\u0440\u0438\u0438 \u041a\u0430\u0441\u043f\u0435\u0440\u0441\u043a\u043e\u0433\u043e \u043f\u0440\u043e\u0430\u043d\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043b \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u0430 VNC (Virtual Network Computing) \u0438 \u0432\u044b\u044f\u0432\u0438\u043b 37 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0432\u044b\u0437\u0432\u0430\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0441 \u043f\u0430\u043c\u044f\u0442\u044c\u044e. \u0412\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 VNC-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u0442\u043e\u043b\u044c\u043a\u043e \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c, \u0430 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u043a\u043b\u0438\u0435\u043d\u0442\u0441\u043a\u043e\u043c \u043a\u043e\u0434\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u044b \u043f\u0440\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043a \u0441\u0435\u0440\u0432\u0435\u0440\u0443, \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u0443\u0435\u043c\u043e\u043c\u0443 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u043c. \u041d\u0430\u0438\u0431\u043e\u043b\u044c\u0448\u0435\u0435 \u0447\u0438\u0441\u043b\u043e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-53107","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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