{"id":112516,"date":"2023-12-27T03:10:17","date_gmt":"2023-12-27T01:10:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-yadre-linux-s-vozmozhnostyu-lokalnoj-ekspluataczii-cherez-nftables"},"modified":"2023-12-27T03:10:17","modified_gmt":"2023-12-27T01:10:17","slug":"uyazvimost-v-yadre-linux-s-vozmozhnostyu-lokalnoj-ekspluataczii-cherez-nftables","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-yadre-linux-s-vozmozhnostyu-lokalnoj-ekspluataczii-cherez-nftables","title":{"rendered":"Vuln\u00e9rabilit\u00e9 dans le noyau Linux avec possibilit\u00e9 d'exploitation locale via nftables","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

<\/p>\n

Vuln\u00e9rabilit\u00e9 d\u00e9tect\u00e9e<\/a> dans le sous-syst\u00e8me Netfilter (CVE-2023-6817<\/a>), qui, en th\u00e9orie, pourrait \u00eatre exploit\u00e9e par un utilisateur local pour \u00e9lever ses privil\u00e8ges dans le syst\u00e8me. La racine du probl\u00e8me r\u00e9side dans l'utilisation de la m\u00e9moire lib\u00e9r\u00e9e (use-after-free) dans le module nf_tables, responsable des fonctionnalit\u00e9s du filtre de paquets nftables.<\/p>\n

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

Vuln\u00e9rabilit\u00e9 pertinent<\/a> \u00e0 partir de la version 5.6 du noyau Linux. Le correctif d'activer<\/a> est dans la version test du noyau Linux 6.7-rc5 et a \u00e9t\u00e9 int\u00e9gr\u00e9 dans les branches stables actuelles 5.10.204, 5.15.143, 6.1.68 et 6.6.7.<\/p>\n

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

Le probl\u00e8me est caus\u00e9 par une erreur dans la fonction nft_pipapo_walk, qui ne v\u00e9rifie pas l'existence de doublons lors de l'it\u00e9ration sur les \u00e9l\u00e9ments PIPAPO (Pile Packet Policies). Cela entra\u00eene un double lib\u00e9ration de m\u00e9moire. Un acc\u00e8s \u00e0 nftables est n\u00e9cessaire pour r\u00e9ussir une attaque, ce qui peut \u00eatre obtenu en ayant les droits CAP_NET_ADMIN dans n'importe quel espace de noms utilisateur (user namespace) ou espace de noms r\u00e9seau (network namespace). Ces droits peuvent \u00eatre accord\u00e9s, par exemple, dans des conteneurs isol\u00e9s. Pour v\u00e9rifier vos syst\u00e8mes, publi\u00e9e<\/a> prototype d'exploit.<\/p>\n

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

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

\u041e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 Netfilter (CVE-2023-6817), \u043a\u043e\u0442\u043e\u0440\u0430\u044f, \u0432 \u0442\u0435\u043e\u0440\u0438\u0438, \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0430 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0434\u043b\u044f \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0438\u0445 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041a\u043e\u0440\u0435\u043d\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043a\u0440\u043e\u0435\u0442\u0441\u044f \u0432 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 (use-after-free) \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 nf_tables, \u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u043c \u0437\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u043f\u0430\u043a\u0435\u0442\u043d\u043e\u0433\u043e \u0444\u0438\u043b\u044c\u0442\u0440\u0430 nftables. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u0430 \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 Linux 5.6. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043e \u0432 \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u044f\u0434\u0440\u0430 Linux 6.7-rc5 \u0438 \u0432\u043d\u0435\u0441\u0435\u043d\u043e \u0432 […]<\/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-112516","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\udd47Vuln\u00e9rabilit\u00e9 dans le noyau Linux avec possibilit\u00e9 d'exploitation locale via nftables | ProHoster","description":"Vuln\u00e9rabilit\u00e9 d\u00e9tect\u00e9e dans le sous-syst\u00e8me Netfilter 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