{"id":92546,"date":"2020-08-28T07:42:57","date_gmt":"2020-08-28T05:42:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd"},"modified":"2020-08-28T07:42:57","modified_gmt":"2020-08-28T05:42:57","slug":"uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","title":{"rendered":"Vulnerabilidad en OpenZFS que interfiere con la gesti\u00f3n de permisos en FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En agregado<\/a><\/noindex> en OpenZFS<\/a><\/noindex> c\u00f3digo para el soporte del sistema operativo FreeBSD revel\u00f3 una cr\u00edtica vulnerabilidad<\/a><\/noindex> (CVE-2020-24717<\/a><\/noindex>), que lleva a una violaci\u00f3n del manejo de permisos. La esencia del problema es que los permisos establecidos para el grupo se trataban como permisos para el propietario del archivo. El problema se solucion\u00f3<\/a><\/noindex> se encuentra en la actualizaci\u00f3n OpenZFS 2.0.0-rc1<\/a><\/noindex>. La correcci\u00f3n se ha introducido<\/a><\/noindex> hasta la transici\u00f3n<\/a><\/noindex> de la base de c\u00f3digo de FreeBSD HEAD a OpenZFS.<\/p>\n

El problema fue causado por el hecho de que todos los elementos de la lista de control de acceso (ACE), establecidos para el propietario del grupo (group@) y grupos comunes (group:), se delegaban al usuario actual.
\nPor ejemplo, el modo de acceso 0770 (escritura permitida solo para miembros del grupo) era tratado como 0777 (escritura permitida para todos los usuarios). Se observ\u00f3 una situaci\u00f3n similar con ACL, por ejemplo, el siguiente ACL se volv\u00eda equivalente a los permisos 0777, ya que la verificaci\u00f3n de miembro del grupo para builtin_administrators devuelve True.<\/p>\n

# owner: root
\n # group: wheel
\n grupo:builtin_administrators:rwxpDdaARWcCos:----:permitir<\/p>\n

Tambi\u00e9n se ha identificado otro problema en el puerto OpenZFS para FreeBSD relacionado con la concesi\u00f3n de permisos para cambiar de directorio (cd), independientemente del estado de la bandera de permisos de ejecuci\u00f3n para los directorios. La entrada al directorio era posible incluso con una prohibici\u00f3n expl\u00edcita a trav\u00e9s de ACL (\u00abdeny \u2014 execute\u00bb). <\/p>\n

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

Fuente: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u043c \u0432 OpenZFS \u043a\u043e\u0434\u0435 \u0434\u043b\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u041e\u0421 FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-24717), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u044e \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0430\u0432 \u0434\u043e\u0441\u0442\u0443\u043f\u0430. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043f\u0440\u0430\u0432\u0430, \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u0434\u043b\u044f \u0433\u0440\u0443\u043f\u043f\u044b, 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[…]<\/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-92546","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\udd47Vulnerabilidad en OpenZFS que afecta al manejo de permisos en FreeBSD | ProHoster","description":"En el c\u00f3digo agregado a OpenZFS.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"es_ES","og:site_name":"ProHoster | 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