{"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\/da\/blog\/news\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","title":{"rendered":"Implementeringen af dom\u00e6nekontrolleren i Samba viste sig at v\u00e6re udsat for ZeroLogin-s\u00e5rbarheden.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Udviklerne af projektet Samba advarer<\/a><\/noindex> brugere, der for nylig afsl\u00f8ret<\/a><\/noindex> en s\u00e5rbarhed i Windows kendt som ZeroLogin (CVE-2020-1472<\/a><\/noindex>) optr\u00e6der<\/a><\/noindex> ) og i implementeringen af dom\u00e6nekontrolleren baseret p\u00e5 Samba. S\u00e5rbarheden er for\u00e5rsaget<\/a><\/noindex> skyldes mangler i protokollen MS-NRPC og krypteringsalgoritmen AES-CFB8, og ved succesfuld udnyttelse kan en angriber f\u00e5 administratoradgang til dom\u00e6nekontrolleren.<\/p>\n

S\u00e5rbarhedens kerne er, at protokollen MS-NRPC (Netlogon Remote Protocol) muligg\u00f8r, at man under dataudvekslingen til autentifikation kan falde tilbage p\u00e5 en RPC-forbindelse uden kryptering. Herefter kan en angriber udnytte en fejl i AES-CFB8-algoritmen til at forfalske (spoofe) en vellykket login. I gennemsnit kr\u00e6ver det cirka 256 fors\u00f8g p\u00e5 spoofing for at f\u00e5 administratorrettigheder. Angrebet kr\u00e6ver ikke en aktiv konto p\u00e5 dom\u00e6necontrolleren \u2014 spoofing-fors\u00f8g kan udf\u00f8res med et forkert password. Anmodningen om autentifikation via NTLM vil blive omdirigeret til dom\u00e6necontrolleren, som vil returnere en adgang n\u00e6gtelse, men angriberen kan \u00e6ndre dette svar, s\u00e5 det angribne system opfatter login som vellykket.<\/p>\n

I Samba manifesterer s\u00e5rbarheden sig kun i systemer, der ikke bruger indstillingen \"server schannel = yes\", som fra Samba 4.8 er sat som standard. Is\u00e6r kan systemer med indstillingerne \"server schannel = no\" og \"server schannel = auto\" v\u00e6re kompromitterede, da de tillader Samba at anvende de samme mangler i AES-CFB8-algoritmen, som ogs\u00e5 findes i Windows. <\/p>\n

Ved brug af et referencemilj\u00f8 til Windows et prototype-exploit<\/a><\/noindex>udl\u00f8ser kun opkaldet ServerAuthenticate3, og operationen ServerPasswordSet2 fejler (exploits kr\u00e6ver tilpasning til Samba). Der gives ingen oplysninger om funktionaliteten af alternative exploits (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>). Fors\u00f8g p\u00e5 angreb p\u00e5 systemerne kan spores ved at analysere forekomsten af poster, der n\u00e6vner ServerAuthenticate3 og ServerPasswordSet i audit-logs fra Samba.<\/p>\n

<\/a><\/noindex><\/p>\n

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 […]<\/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\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Implementeringen af dom\u00e6nekontrolleren i Samba er blevet udsat for s\u00e5rbarheden ZeroLogin | ProHoster","description":"Udviklerne af projektet Samba har advaret brugerne om, at der for 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