{"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\/et\/blog\/news\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","title":{"rendered":"Samba domeenikontrolleri teostus osutus ZeroLogin-i haavatavuseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Samba projekti arendajad hoiatavad<\/a><\/noindex> kasutajad, et hiljuti tuvastatud<\/a><\/noindex> Windowsis avastatud ZeroLogin haavatavus (CVE-2020-1472<\/a><\/noindex>) ilmneb<\/a><\/noindex> ja Samba p\u00f5hjal tehtud domeenikontrolleri rakenduses. Haavatavus on p\u00f5hjustatud<\/a><\/noindex> on MS-NRPC protokolli ja AES-CFB8 kr\u00fcptoalgoritmi puudustes ning edukal kasutamisel v\u00f5imaldab see r\u00fcndajal saada administraatori juurdep\u00e4\u00e4su domeenikontrollerile.<\/p>\n

Haavatavuse p\u00f5hjus seisneb selles, et MS-NRPC (Netlogon Remote Protocol) protokoll v\u00f5imaldab autentimisandmete vahetamisel tagasi minna RPC-\u00fchenduse kasutamisele ilma kr\u00fcpteerimiseta. P\u00e4rast seda v\u00f5ib r\u00fcndaja kasutada AES-CFB8 algoritmi haavatavust, et valeandmete (spoofing) abil s\u00fcsteemi siseneda. Keskmiselt on administraatori \u00f5igustega sisenemiseks vaja umbes 256 valeandmete katset. R\u00fcnnaku teostamiseks ei ole vajalik t\u00f6\u00f6tava kasutajakonto olemasolu domeeni kontrolleris \u2014 valeandmete katsetusi saab teha vale parooliga. NTLM-i autentimisproovi suunatakse domeeni kontrollerisse, mis tagastab juurdep\u00e4\u00e4su keeldumise, kuid r\u00fcndaja v\u00f5ib selle vastuse \u00fcmber \u00fcmber kirjutada, ja r\u00fcnnaku all oleva s\u00fcsteemi jaoks tundub, et sisenemine oli edukas.<\/p>\n

Sambas avaldub haavatavus ainult s\u00fcsteemides, mis ei kasuta seadistust \u201eserver schannel = yes\u201d, mis on alates Samba 4.8 vaikimisi lubatud. Eelk\u00f5ige v\u00f5ivad olla ohustatud s\u00fcsteemid, millel on seadistused \u201eserver schannel = no\u201d ja \u201eserver schannel = auto\u201d, mis v\u00f5imaldavad Sambas kasutada samu puudusi AES-CFB8 algoritmis, mis on olemas ka Windowsis. <\/p>\n

Windowsile ettevalmistatud standardprotot\u00fc\u00fcbiga exploit<\/a><\/noindex>, sambas k\u00e4ivitub ainult ServerAuthenticate3 kutse, samas kui ServerPasswordSet2 operatsioon l\u00f5peb t\u00f5rke t\u00f5ttu (exploit vajab Sambale kohandamist). Alternatiivsete exploitide toimimise kohta1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>) ei ole midagi teada. R\u00fcnnakute katsete j\u00e4lgimiseks saab anal\u00fc\u00fcsida logisid, kus on mainitud ServerAuthenticate3 ja ServerPasswordSet kirjeid Sambas.<\/p>\n

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

Allikas: 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\udd47Domeenikontrolleri rakendus Sambas osutus ZeroLogin haavatavusele | ProHoster","description":"Samba projekti arendajad hoiatavad kasutajaid, et 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