{"id":103151,"date":"2022-01-31T21:36:52","date_gmt":"2022-01-31T19:36:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonnaya-root-uyazvimost-v-samba"},"modified":"2022-01-31T21:36:52","modified_gmt":"2022-01-31T19:36:52","slug":"udalyonnaya-root-uyazvimost-v-samba","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/udalyonnaya-root-uyazvimost-v-samba","title":{"rendered":"Vulnerabilidad root remota en Samba","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Se han publicado versiones correctivas de los paquetes 4.15.5, 4.14.12 y 4.13.17 que solucionan 3 vulnerabilidades. La vulnerabilidad m\u00e1s cr\u00edtica (CVE-2021-44142) permite a un atacante remoto ejecutar c\u00f3digo arbitrario con privilegios de root en un sistema con una versi\u00f3n vulnerable de Samba. Se le ha asignado un nivel de gravedad de 9.9 sobre 10.    <\/p>\n<p>La vulnerabilidad solo se manifiesta al usar el m\u00f3dulo VFS vfs_fruit con la configuraci\u00f3n predeterminada (fruit:metadata=netatalk o fruit:resource=file), que proporciona un nivel adicional de compatibilidad con clientes de mac OS y mejora la portabilidad con archivos. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-dusseldorf\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3448\">servidores<\/a> Netatalk 3 AFP. El problema es causado por un desbordamiento de b\u00fafer en el c\u00f3digo de an\u00e1lisis de metadatos con atributos extendidos (EA, xattr), que se activa durante la apertura de archivos en smbd. Para llevar a cabo el ataque, el usuario debe tener acceso de escritura a los atributos extendidos del archivo, y el ataque puede ser realizado incluso por un usuario invitado, si se le permite dicha escritura.          <\/p>\n<p>Puede seguir las actualizaciones de paquetes en las distribuciones en las p\u00e1ginas: Debian, Ubuntu, RHEL, SUSE, Fedora, Arch, FreeBSD. Como soluci\u00f3n alternativa de protecci\u00f3n, puede eliminar el m\u00f3dulo &laquo;fruit&raquo; de la lista &laquo;vfs objects&raquo; en smb.conf.      <\/p>\n<p>Las otras dos vulnerabilidades:  <\/p>\n<ul>\n<li class=\"l\"> La vulnerabilidad CVE-2022-0336 permite a un usuario de Samba AD DC hacerse pasar por otro servicio y llevar a cabo la interceptaci\u00f3n del tr\u00e1fico dirigido a ese servicio. Para realizar el ataque, el usuario debe tener derecho a modificar el atributo servicePrincipalName en la cuenta.\n<li class=\"l\"> La vulnerabilidad CVE-2021-44141 puede llevar a la fuga de informaci\u00f3n sobre la existencia de archivos y directorios en el \u00e1rea de FS m\u00e1s all\u00e1 de la partici\u00f3n exportada de Samba. El ataque se lleva a cabo mediante la manipulaci\u00f3n de enlaces simb\u00f3licos.  <\/ul>\n<p>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56615\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 4.15.5, 4.14.12 \u0438 4.13.17 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 3 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-44142) \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0435\u0439 Samba. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 9.9 \u0438\u0437 10. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 VFS-\u043c\u043e\u0434\u0443\u043b\u044f vfs_fruit \u0441 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430\u043c\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e (fruit:metadata=netatalk \u0438\u043b\u0438 fruit:resource=file), \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c [&hellip;]<\/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-103151","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" 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