{"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\/pl\/blog\/news\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","title":{"rendered":"Realizacja kontrolera domeny w Samba okaza\u0142a si\u0119 podatna na podatno\u015b\u0107 ZeroLogin","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Deweloperzy projektu Samba ostrzegli<\/a><\/noindex> u\u017cytkownik\u00f3w, \u017ce niedawno ujawniona<\/a><\/noindex> w Windows luka ZeroLogin (CVE-2020-1472<\/a><\/noindex>) objawia si\u0119<\/a><\/noindex> i w implementacji kontrolera domeny opartego na Samba. Luka jest spowodowany<\/a><\/noindex> wynika z niedoci\u0105gni\u0119\u0107 w protokole MS-NRPC oraz algorytmie kryptograficznym AES-CFB8, a jej skutkiem jest mo\u017cliwo\u015b\u0107 uzyskania dost\u0119pu do konta administratora w kontrolerze domeny przez atakuj\u0105cego.<\/p>\n

Istot\u0105 podatno\u015bci jest to, \u017ce protok\u00f3\u0142 MS-NRPC (Netlogon Remote Protocol) pozwala na powr\u00f3t do korzystania z po\u0142\u0105czenia RPC bez szyfrowania podczas wymiany danych uwierzytelniaj\u0105cych. Po tym atakuj\u0105cy mo\u017ce wykorzysta\u0107 luk\u0119 w algorytmie AES-CFB8 do fa\u0142szowania (spoofingu) pomy\u015blnego logowania do systemu. Aby uzyska\u0107 dost\u0119p z uprawnieniami administratora, \u015brednio wymaganych jest oko\u0142o 256 pr\u00f3b spoofingu. Do przeprowadzenia ataku nie jest wymagane posiadanie dzia\u0142aj\u0105cego konta w kontrolerze domeny \u2014 pr\u00f3by spoofingu mo\u017cna podejmowa\u0107 u\u017cywaj\u0105c nieprawid\u0142owego has\u0142a. \u017b\u0105danie uwierzytelnienia przez NTLM zostanie przekierowane do kontrolera domeny, kt\u00f3ry zwr\u00f3ci odmow\u0119 dost\u0119pu, ale atakuj\u0105cy mo\u017ce podmieni\u0107 t\u0119 odpowied\u017a, a atakowany system uzna logowanie za udane.<\/p>\n

W Samba podatno\u015b\u0107 przejawia si\u0119 tylko w systemach, kt\u00f3re nie u\u017cywaj\u0105 ustawienia \u201eserver schannel = yes\u201d, kt\u00f3re od wersji Samba 4.8 jest domy\u015blne. Szczeg\u00f3lnie nara\u017cone s\u0105 systemy z ustawieniami \u201eserver schannel = no\u201d i \u201eserver schannel = auto\u201d, kt\u00f3re pozwalaj\u0105 w Samba na korzystanie z tych samych niedoci\u0105gni\u0119\u0107 w algorytmie AES-CFB8, co w Windows. <\/p>\n

Podczas u\u017cywania przygotowanego dla Windows wzorcowego protoko\u0142u exploita<\/a><\/noindex>, w Samba uruchamia si\u0119 tylko wywo\u0142anie ServerAuthenticate3, a operacja ServerPasswordSet2 ko\u0144czy si\u0119 niepowodzeniem (exploity wymagaj\u0105 dostosowania do Samba). O pracowito\u015bci alternatywnych exploit\u00f3w (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>) nie ma \u017cadnych informacji. Mo\u017cliwo\u015b\u0107 \u015bledzenia pr\u00f3b ataku na systemy mo\u017cna uzyska\u0107 poprzez analiz\u0119 obecno\u015bci wpis\u00f3w z odniesieniem do ServerAuthenticate3 i ServerPasswordSet w logach audytu Samba.<\/p>\n

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

\u0179r\u00f3d\u0142o: 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\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\udd47Implementacja kontrolera domeny w Samba okaza\u0142a si\u0119 podatna na luk\u0119 ZeroLogin | ProHoster","description":"Deweloperzy projektu Samba ostrzegli u\u017cytkownik\u00f3w, \u017ce 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