{"id":33708,"date":"2019-10-31T21:54:17","date_gmt":"2019-10-31T18:54:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-exchange-kak-obnaruzhit-povyshenie-privilegij-do-administratora-domena\/"},"modified":"2019-10-31T21:54:17","modified_gmt":"2019-10-31T18:54:17","slug":"uyazvimost-exchange-kak-obnaruzhit-povyshenie-privilegij-do-administratora-domena","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/administrirovanie\/uyazvimost-exchange-kak-obnaruzhit-povyshenie-privilegij-do-administratora-domena","title":{"rendered":"Vulnerabilidad de Exchange: c\u00f3mo detectar un aumento de privilegios a administrador de dominio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Vulnerabilidad detectada este a\u00f1o <noindex><a rel=\"nofollow\" href=\"https:\/\/dirkjanm.io\/abusing-exchange-one-api-call-away-from-domain-admin\/\">en Exchange<\/a><\/noindex> permite a cualquier usuario del dominio obtener derechos de administrador del dominio y comprometer Active Directory (AD) y otros hosts conectados. Hoy explicaremos c\u00f3mo funciona este ataque y c\u00f3mo detectarlo. <\/p>\n<p><img decoding=\"async\" alt=\"Vulnerabilidad de Exchange: c\u00f3mo detectar un aumento de privilegios a administrador de dominio\" src=\"\/wp-content\/uploads\/2019\/05\/12a864f42046627d1ae2dfe3be7bc30b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b> As\u00ed es como funciona este ataque:<\/b><\/p>\n<ol>\n<li>Un atacante toma control de la cuenta de cualquier usuario del dominio con un buz\u00f3n de correo activo para suscribirse a la funci\u00f3n de notificaciones push de Exchange.<\/li>\n<li>El atacante utiliza un relay NTLM para enga\u00f1ar al servidor de Exchange: finalmente, el servidor de Exchange se conecta a la computadora del usuario comprometido mediante el m\u00e9todo NTLM sobre HTTP, que el atacante luego utiliza para pasar el proceso de autenticaci\u00f3n en el controlador de dominio a trav\u00e9s de LDAP con los datos de la cuenta de Exchange.<\/li>\n<li>Como resultado, el atacante utiliza estos privilegios de la cuenta de Exchange para elevar sus privilegios. Este \u00faltimo paso tambi\u00e9n podr\u00eda ser realizado por un administrador malintencionado que ya tiene acceso leg\u00edtimo para hacer el cambio de permisos necesario. Al crear una regla para detectar esta actividad, estar\u00e1s protegido de este y ataques similares.<\/li>\n<\/ol>\n<p>\nPosteriormente, el atacante podr\u00eda, por ejemplo, ejecutar DCSync para obtener las contrase\u00f1as hash de todos los usuarios del dominio. Esto le permitir\u00e1 llevar a cabo varios tipos de ataques, desde ataques de golden ticket hasta la transmisi\u00f3n de hashes.<\/p>\n<p>El equipo de investigaci\u00f3n de Varonis ha analizado este vector de ataque en detalle y ha preparado una gu\u00eda para nuestros clientes para detectarlo y al mismo tiempo verificar si ya han sido comprometidos.<\/p>\n<h2><b>Detecci\u00f3n de elevaci\u00f3n de privilegios en el dominio<\/b><\/h2>\n<p>\nEn <noindex><a rel=\"nofollow\" href=\"https:\/\/sites.varonis.com\/ru\/products\/datalert\/\">DatAlert<\/a><\/noindex> crea una regla personalizada para rastrear cambios en ciertos permisos de objeto. Se activar\u00e1 al a\u00f1adir derechos y permisos al objeto de inter\u00e9s en el dominio:<\/p>\n<ol>\n<li>Especifica el nombre de la regla<\/li>\n<li>Establece la categor\u00eda como 'Elevaci\u00f3n de privilegios' <\/li>\n<li>Define el valor para el tipo de recurso como 'Todos los tipos de recursos' <\/li>\n<li>Servidor de archivos = DirectoryServices <\/li>\n<li>Especifica el dominio de tu inter\u00e9s, por ejemplo, por nombre <\/li>\n<li>A\u00f1ade un filtro para la adici\u00f3n de permisos en el objeto AD <\/li>\n<li>Y no olvides dejar sin marcar la opci\u00f3n de 'Buscar en objetos hijo' <\/li>\n<\/ol>\n<p>\n<img decoding=\"async\" alt=\"Vulnerabilidad de Exchange: c\u00f3mo detectar un aumento de privilegios a administrador de dominio\" src=\"\/wp-content\/uploads\/2019\/05\/0cf2b115a007cd44253adbae88e41b39.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h2> <b>Y ahora el informe: detecci\u00f3n de cambios en los permisos del objeto del dominio <\/b><\/h2>\n<p>\nLos cambios en los permisos de un objeto AD son bastante raros, por lo que todo lo que haya causado esta advertencia debe ser investigado. Tambi\u00e9n ser\u00eda bueno probar la apariencia y el contenido del informe antes de poner en marcha la regla misma.<\/p>\n<p>Este informe tambi\u00e9n mostrar\u00e1 si ya ha sido comprometido por este ataque:<\/p>\n<p><img decoding=\"async\" alt=\"Vulnerabilidad de Exchange: c\u00f3mo detectar un aumento de privilegios a administrador de dominio\" src=\"\/wp-content\/uploads\/2019\/05\/d0f815a00dbcd0385c9632d66a4546db.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDespu\u00e9s de activar la regla, se pueden investigar todos los dem\u00e1s eventos de elevaci\u00f3n de privilegios utilizando la interfaz web de DatAlert:<\/p>\n<p><img decoding=\"async\" alt=\"Vulnerabilidad de Exchange: c\u00f3mo detectar un aumento de privilegios a administrador de dominio\" src=\"\/wp-content\/uploads\/2019\/05\/29f01b0c8882ebdf022719941e131645.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nUna vez configurada esta regla, podr\u00e1 monitorear y protegerse contra este tipo de vulnerabilidades en el sistema de seguridad, investigar eventos relacionados con objetos de servicios de directorio AD y verificar si es vulnerable a esta cr\u00edtica brecha de seguridad.<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/varonis\/blog\/451906\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u043d\u0430\u044f \u0432 \u044d\u0442\u043e\u043c \u0433\u043e\u0434\u0443 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Exchange \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043b\u044e\u0431\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u043c\u0435\u043d\u0430 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440\u0430 \u0434\u043e\u043c\u0435\u043d\u0430 \u0438 \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c Active Directory (AD) \u0438 \u0434\u0440\u0443\u0433\u0438\u0435 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u043d\u044b\u0435 \u0445\u043e\u0441\u0442\u044b. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u043c\u044b \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0435\u043c, \u043a\u0430\u043a \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u044d\u0442\u0430 \u0430\u0442\u0430\u043a\u0430 \u0438 \u043a\u0430\u043a \u0435\u0435 \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u0442\u044c. \u0412\u043e\u0442 \u043a\u0430\u043a \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u044d\u0442\u0430 \u0430\u0442\u0430\u043a\u0430: \u0417\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a \u0437\u0430\u0432\u043b\u0430\u0434\u0435\u0432\u0430\u0435\u0442 \u0443\u0447\u0435\u0442\u043d\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u044c\u044e \u043b\u044e\u0431\u043e\u0433\u043e \u0434\u043e\u043c\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0441 \u0430\u043a\u0442\u0438\u0432\u043d\u044b\u043c \u043f\u043e\u0447\u0442\u043e\u0432\u044b\u043c \u044f\u0449\u0438\u043a\u043e\u043c, \u0447\u0442\u043e\u0431\u044b \u043f\u043e\u0434\u043f\u0438\u0441\u0430\u0442\u044c\u0441\u044f \u043d\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25390,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-33708","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u043d\u0430\u044f \u0432 \u044d\u0442\u043e\u043c \u0433\u043e\u0434\u0443 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Exchange \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043b\u044e\u0431\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u043c\u0435\u043d\u0430 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