{"id":94510,"date":"2020-09-18T01:41:56","date_gmt":"2020-09-17T23:41:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin"},"modified":"2020-09-18T01:41:56","modified_gmt":"2020-09-17T23:41:56","slug":"realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/news\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","title":{"rendered":"Die Implementierung des Dom\u00e4nencontrollers in Samba ist einer ZeroLogin-Sicherheitsanf\u00e4lligkeit ausgesetzt.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Entwickler des Samba-Projekts <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/samba-announce@lists.samba.org\/msg00523.html\">haben gewarnt<\/a><\/noindex> benutzer, dass k\u00fcrzlich <noindex><a rel=\"nofollow\" href=\"https:\/\/portal.msrc.microsoft.com\/en-US\/security-guidance\/advisory\/CVE-2020-1472\">identifiziert<\/a><\/noindex> in Windows die ZeroLogin-Sicherheitsanf\u00e4lligkeit (<noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2020-1472\">CVE-2020-1472<\/a><\/noindex>) <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.samba.org\/show_bug.cgi?id=14497\">zeigt sich<\/a><\/noindex> ) und in der Implementierung des Samba-Domaincontrollers. Die Sicherheitsanf\u00e4lligkeit <noindex><a rel=\"nofollow\" href=\"https:\/\/www.secura.com\/pathtoimg.php?id=2055\">wird verursacht<\/a><\/noindex> ist auf Schw\u00e4chen im MS-NRPC-Protokoll und dem AES-CFB8-Kryptoalgorithmus zur\u00fcckzuf\u00fchren und erm\u00f6glicht es Angreifern, Administratorzugriff auf den Domaincontroller zu erlangen, wenn sie erfolgreich ausgenutzt wird.<\/p>\n<p>Die Essenz der Schwachstelle besteht darin, dass das MS-NRPC-Protokoll (Netlogon Remote Protocol) bei der \u00dcbertragung von Authentifizierungsdaten auf eine unverschl\u00fcsselte RPC-Verbindung zur\u00fcckfallen kann. Dadurch kann ein Angreifer eine L\u00fccke im AES-CFB8-Algorithmus ausnutzen, um einen erfolgreichen Systemzugang zu f\u00e4lschen (Spoofing). Im Durchschnitt sind etwa 256 Spoofing-Versuche erforderlich, um mit Administratorrechten auf das System zuzugreifen. F\u00fcr einen Angriff ist kein funktionierendes Benutzerkonto beim Dom\u00e4nencontroller erforderlich - Spoofing-Versuche k\u00f6nnen mit einem falschen Passwort unternommen werden. Die Authentifizierungsanfrage \u00fcber NTLM wird an den Dom\u00e4nencontroller umgeleitet, der den Zugriff verweigert, jedoch kann der Angreifer diese Antwort manipulieren, sodass das angegriffene System den Zugang als erfolgreich betrachtet.<\/p>\n<p>In Samba tritt die Schwachstelle nur in Systemen auf, die die Einstellung \"server schannel = yes\" nicht verwenden, die seit Samba 4.8 standardm\u00e4\u00dfig aktiviert ist. Insbesondere k\u00f6nnen Systeme mit den Einstellungen \"server schannel = no\" und \"server schannel = auto\" kompromittiert werden, da sie in Samba dieselben M\u00e4ngel im AES-CFB8-Algorithmus verwenden wie in Windows. <\/p>\n<p>Bei Verwendung eines f\u00fcr Windows vorbereiteten Referenz- <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/SecuraBV\/CVE-2020-1472\/blob\/master\/zerologon_tester.py\">Exploits<\/a><\/noindex>, wird in Samba nur der Aufruf ServerAuthenticate3 ausgef\u00fchrt, w\u00e4hrend die Operation ServerPasswordSet2 mit einem Fehler endet (der Exploit erfordert Anpassungen f\u00fcr Samba). Zur Funktionalit\u00e4t alternativer Exploits (<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/blackarrowsec\/redteam-research\/tree\/master\/CVE-2020-1472\">1<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/dirkjanm\/CVE-2020-1472\">2<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/nccgroup\/nccfsas\/tree\/main\/Tools\/SharpZeroLogon\">3<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/gentilkiwi\/mimikatz\/releases\">4<\/a><\/noindex>) gibt es keine Informationen. Angriffsversuche auf Systeme k\u00f6nnen durch die Analyse von Eintr\u00e4gen mit Erw\u00e4hnung von ServerAuthenticate3 und ServerPasswordSet in den Samba-Auditprotokollen verfolgt werden.<\/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=53728\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Samba \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u0447\u0442\u043e \u043d\u0435\u0434\u0430\u0432\u043d\u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u0430\u044f \u0432 Windows \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c ZeroLogin (CVE-2020-1472) \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0438 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0430 \u0434\u043e\u043c\u0435\u043d\u0430 \u043d\u0430 \u0431\u0430\u0437\u0435 Samba. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043d\u0435\u0434\u043e\u0440\u0430\u0431\u043e\u0442\u043a\u0430\u043c\u0438 \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 MS-NRPC \u0438 \u043a\u0440\u0438\u043f\u0442\u043e\u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0435 AES-CFB8, \u0438 \u043f\u0440\u0438 \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0439 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u0430 \u0432 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0435 \u0434\u043e\u043c\u0435\u043d\u0430. \u0421\u0443\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b MS-NRPC (Netlogon Remote Protocol) \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u0440\u0438 [&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-94510","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- 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