{"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\/es\/blog\/news\/realizacziya-kontrollera-domena-v-samba-okazalas-podverzhena-uyazvimosti-zerologin","title":{"rendered":"La implementaci\u00f3n del controlador de dominio en Samba ha demostrado ser vulnerable a ZeroLogin","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Desarrolladores del proyecto Samba advirtieron<\/a><\/noindex> a los usuarios que recientemente descubierta<\/a><\/noindex> una vulnerabilidad ZeroLogin en Windows (CVE-2020-1472<\/a><\/noindex>) se manifiesta<\/a><\/noindex> y en la implementaci\u00f3n del controlador de dominio basado en Samba. La vulnerabilidad por un c\u00e1lculo incorrecto del tama\u00f1o de los paquetes L2CAP (protocolo de control de enlace l\u00f3gico y adaptaci\u00f3n), en el caso de que los datos enviados por el remitente superen el tama\u00f1o esperado.<\/a><\/noindex> se origina de fallos en el protocolo MS-NRPC y en el algoritmo criptogr\u00e1fico AES-CFB8, y al ser explotada con \u00e9xito permite a un atacante obtener acceso de administrador al controlador de dominio.<\/p>\n

La esencia de la vulnerabilidad radica en que el protocolo MS-NRPC (Protocolo Remoto Netlogon) permite, durante el intercambio de datos de autenticaci\u00f3n, retroceder al uso de una conexi\u00f3n RPC sin cifrado. Despu\u00e9s de esto, un atacante puede aprovechar un fallo en el algoritmo AES-CFB8 para falsificar (spoofing) un inicio de sesi\u00f3n exitoso. En promedio, se requieren alrededor de 256 intentos de spoofing para acceder con derechos de administrador. No se necesita tener una cuenta de usuario v\u00e1lida en el controlador de dominio; los intentos de spoofing se pueden realizar usando contrase\u00f1as incorrectas. Una solicitud de autenticaci\u00f3n a trav\u00e9s de NTLM ser\u00e1 redirigida al controlador de dominio, que devolver\u00e1 un acceso denegado, pero el atacante puede suplantar esta respuesta, y el sistema atacado considerar\u00e1 la entrada como exitosa.<\/p>\n

En Samba, la vulnerabilidad se manifiesta solo en sistemas que no utilizan la configuraci\u00f3n \u2018server schannel = yes\u2019, que desde Samba 4.8 est\u00e1 habilitada por defecto. En particular, pueden verse comprometidos los sistemas con configuraciones \u2018server schannel = no\u2019 y \u2018server schannel = auto\u2019, que permiten a Samba utilizar las mismas fallas en el algoritmo AES-CFB8 que en Windows. <\/p>\n

Al utilizar un prototipo de exploit preparado para Windows convenientemente<\/a><\/noindex>, en Samba solo se activa la llamada ServerAuthenticate3, mientras que la operaci\u00f3n ServerPasswordSet2 falla (el exploit requiere adaptaci\u00f3n para Samba). No se informa sobre la funcionalidad de exploits alternativos (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>). Se pueden rastrear intentos de ataque a los sistemas mediante el an\u00e1lisis de registros que mencionan ServerAuthenticate3 y ServerPasswordSet en los logs de auditor\u00eda de Samba.<\/p>\n

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

Fuente: 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\udd47La implementaci\u00f3n del controlador de dominio en Samba ha sido vulnerable a la vulnerabilidad ZeroLogin | ProHoster","description":"Los desarrolladores del proyecto Samba han advertido a los usuarios que 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