{"id":103146,"date":"2022-01-31T15:36:54","date_gmt":"2022-01-31T13:36:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii"},"modified":"2022-01-31T15:36:54","modified_gmt":"2022-01-31T13:36:54","slug":"uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Vuln\u00e9rabilit\u00e9 dans le m\u00e9canisme ucount du noyau Linux permettant d'\u00e9lever ses privil\u00e8ges","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Une vuln\u00e9rabilit\u00e9 (CVE-2022-24122) a \u00e9t\u00e9 identifi\u00e9e dans le noyau Linux dans le code de gestion des limites rlimit dans diff\u00e9rents espaces de noms des identifiants d'utilisateurs (user namespaces), permettant d'\u00e9lever ses privil\u00e8ges dans le syst\u00e8me. Ce probl\u00e8me appara\u00eet \u00e0 partir du noyau Linux 5.14 et sera corrig\u00e9 dans les mises \u00e0 jour 5.16.5 et 5.15.19. Les branches stables de Debian, Ubuntu, SUSE\/openSUSE et RHEL ne sont pas concern\u00e9es, mais le probl\u00e8me se manifeste dans les noyaux r\u00e9cents de Fedora et d'Arch Linux. <\/p>\n

Une erreur a \u00e9t\u00e9 introduite dans le changement ajout\u00e9 \u00e0 l'\u00e9t\u00e9 2021, qui fait passer l'impl\u00e9mentation de certains compteurs RLIMIT \u00e0 l'utilisation de la structure \u00ab ucounts \u00bb. Les objets \u00ab ucounts \u00bb cr\u00e9\u00e9s pour RLIMIT ont continu\u00e9 \u00e0 \u00eatre utilis\u00e9s apr\u00e8s la lib\u00e9ration de la m\u00e9moire qui leur \u00e9tait allou\u00e9e (use-after-free) lors de la suppression de l'espace de noms qui leur \u00e9tait associ\u00e9, ce qui a permis d'ex\u00e9cuter du code au niveau du noyau. <\/p>\n

L'exploitation de la vuln\u00e9rabilit\u00e9 par un utilisateur non privil\u00e9gi\u00e9 n'est possible que si l'acc\u00e8s non privil\u00e9gi\u00e9 \u00e0 l'espace de noms des identifiants d'utilisateurs (unprivileged user namespace) est activ\u00e9 dans le syst\u00e8me, ce qui est activ\u00e9 par d\u00e9faut dans Ubuntu et Fedora, mais pas dans Debian et RHEL. Comme solution pour bloquer la vuln\u00e9rabilit\u00e9, il est possible de d\u00e9sactiver l'acc\u00e8s non privil\u00e9gi\u00e9 \u00e0 l'espace de noms d'utilisateur : sysctl -w kernel.unprivileged_userns_clone=0
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u044f\u0434\u0440\u0435 Linux \u0432 \u043a\u043e\u0434\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439 rlimit \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0430\u0445 \u0438\u043c\u0451\u043d \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 (user namespaces) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-24122), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 Linux 5.14 \u0438 \u0431\u0443\u0434\u0435\u0442 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 5.16.5 \u0438 5.15.19. \u0421\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0435 \u0432\u0435\u0442\u043a\u0438 Debian, Ubuntu, SUSE\/openSUSE \u0438 RHEL \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043d\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442, \u043d\u043e \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0441\u0432\u0435\u0436\u0438\u0445 \u044f\u0434\u0440\u0430\u0445 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