{"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\/ro\/blog\/news\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","title":{"rendered":"Implementarea controlerului de domeniu \u00een Samba s-a dovedit a fi vulnerabil\u0103 la ZeroLogin","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dezvoltatorii proiectului Samba au avertizat<\/a><\/noindex> utilizatori, c\u0103 recent a fost identificat\u0103<\/a><\/noindex> \u00een Windows vulnerabilitatea ZeroLogin (CVE-2020-1472<\/a><\/noindex>) se manifest\u0103<\/a><\/noindex> \u0219i \u00een implementarea controlerului de domeniu bazat pe Samba. Vulnerabilitatea provocat\u0103<\/a><\/noindex> rezult\u0103 din deficien\u021be \u00een protocolul MS-NRPC \u0219i algoritmul criptografic AES-CFB8 \u0219i, odat\u0103 exploatat\u0103 cu succes, permite atacatorului s\u0103 ob\u021bin\u0103 acces de administrator \u00een controlerul de domeniu.<\/p>\n

Vulnerabilitatea const\u0103 \u00een faptul c\u0103 protocolul MS-NRPC (Netlogon Remote Protocol) permite, \u00een timpul schimbului de date pentru autentificare, revenirea la utilizarea unei conexiuni RPC f\u0103r\u0103 criptare. Dup\u0103 aceea, un atacator poate profita de o bre\u0219\u0103 \u00een algoritmul AES-CFB8 pentru a falsifica (spoofia) o autentificare reu\u0219it\u0103. \u00cen medie, pentru a ob\u021bine drepturi de administrator, sunt necesare aproximativ 256 de \u00eencerc\u0103ri de spoofing. Pentru a efectua atacul, nu este necesar\u0103 o cont de utilizator valid \u00een controlerul de domeniu \u2014 \u00eencerc\u0103rile de spoofing pot fi realizate folosind o parol\u0103 gre\u0219it\u0103. Cererea de autentificare prin NTLM va fi redirec\u021bionat\u0103 c\u0103tre controlerul de domeniu, care va returna un refuz de acces, dar atacatorul poate modifica acest r\u0103spuns, iar sistemul atacat va considera c\u0103 autentificarea a fost reu\u0219it\u0103.<\/p>\n

\u00cen Samba, vulnerabilitatea se manifest\u0103 doar \u00een sistemele care nu utilizeaz\u0103 setarea \u201eserver schannel = yes\u201d, care, \u00eencep\u00e2nd cu Samba 4.8, este activat\u0103 \u00een mod implicit. \u00cen special, pot fi compromise sistemele cu set\u0103rile \u201eserver schannel = no\u201d \u0219i \u201eserver schannel = auto\u201d, care permit ca Samba s\u0103 foloseasc\u0103 acelea\u0219i deficien\u021be \u00een algoritmul AES-CFB8, la fel ca \u00een Windows. <\/p>\n

C\u00e2nd se folose\u0219te un prototip de exploit standard pentru Windows \u00een Samba r\u0103spunde doar apelul ServerAuthenticate3, iar opera\u021bia ServerPasswordSet2 se finalizeaz\u0103 cu e\u0219ec (exploitul necesit\u0103 adaptare pentru Samba). Nu se raporteaz\u0103 nimic despre func\u021bionalitatea exploiturilor alternative (<\/a><\/noindex>) Se pot urm\u0103ri \u00eencerc\u0103rile de atac asupra sistemelor prin analiza existen\u021bei \u00eenregistr\u0103rilor care men\u021bioneaz\u0103 ServerAuthenticate3 \u0219i ServerPasswordSet \u00een logurile de audit Samba.1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>VxLAN fabrica. Partea 3<\/p>\n

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

Sursa: opennet.ro<\/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\udd47Implementarea controlerului de domeniu \u00een Samba s-a dovedit a fi vulnerabil\u0103 la ZeroLogin | ProHoster","description":"\ud83e\udd47Implementarea controlerului de domeniu \u00een Samba s-a dovedit a fi vulnerabil\u0103 la ZeroLogin | 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