{"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\/nl\/blog\/news\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","title":{"rendered":"De implementatie van de domeincontroller in Samba blijkt kwetsbaar te zijn voor de ZeroLogin-kwetsbaarheid.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ontwikkelaars van het Samba-project <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/samba-announce@lists.samba.org\/msg00523.html\">waarschuwden<\/a><\/noindex> gebruikers dat onlangs <noindex><a rel=\"nofollow\" href=\"https:\/\/portal.msrc.microsoft.com\/en-US\/security-guidance\/advisory\/CVE-2020-1472\">ontdekt<\/a><\/noindex> een kwetsbaarheid in Windows ZeroLogin (<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\">verschijnt<\/a><\/noindex> en in de implementatie van de domeincontroller op basis van Samba. De kwetsbaarheid <noindex><a rel=\"nofollow\" href=\"https:\/\/www.secura.com\/pathtoimg.php?id=2055\">is caused by<\/a><\/noindex> is afkomstig van tekortkomingen in het MS-NRPC-protocol en de cryptografische algoritme AES-CFB8, en stelt aanvallers in staat om toegang tot een domeincontroller te verkrijgen bij succesvolle exploitatie.<\/p>\n<p>De kern van de kwetsbaarheid is dat het MS-NRPC-protocol (Netlogon Remote Protocol) tijdens de uitwisseling van authenticatiegegevens kan terugvallen op het gebruik van een RPC-verbinding zonder encryptie. Hierna kan een aanvaller de kwetsbaarheid in het AES-CFB8-algoritme gebruiken om succesvol in te loggen (spoofing). Gemiddeld zijn er ongeveer 256 spoofing-pogingen nodig voor toegang tot administratorrechten. Voor het uitvoeren van een aanval is het niet nodig om een werkend account op de domeincontroller te hebben \u2014 spoofing-pogingen kunnen worden gedaan met een onjuist wachtwoord. Een authenticatieverzoek via NTLM wordt omgeleid naar de domeincontroller, die toegang zal weigeren, maar de aanvaller kan dit antwoord vervalsen, waardoor het aangevallen systeem de inlog als succesvol beschouwt.<\/p>\n<p>In Samba manifesteert de kwetsbaarheid zich alleen op systemen die de instelling \"server schannel = yes\" niet gebruiken, die vanaf Samba 4.8 standaard is ingeschakeld. Met name systemen met de instellingen \"server schannel = no\" en \"server schannel = auto\" kunnen kwetsbaar zijn, omdat ze dezelfde tekortkomingen in het AES-CFB8-algoritme mogelijk maken als in Windows. <\/p>\n<p>Bij gebruik van een referentie-exploit gericht op Windows <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/SecuraBV\/CVE-2020-1472\/blob\/master\/zerologon_tester.py\">gaat het prototype<\/a><\/noindex>, in Samba wordt alleen de oproep ServerAuthenticate3 uitgevoerd, terwijl de operatie ServerPasswordSet2 mislukt (de exploit vereist aanpassing voor Samba). Er wordt niets gemeld over de werking van alternatieve 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>). Pogingen tot aanvallen op systemen kunnen worden gevolgd via de analyse van logboeken met vermeldingen van ServerAuthenticate3 en ServerPasswordSet in de auditlogs van Samba.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Bron: <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<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta 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