Deux vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9tect\u00e9es dans le noyau Linux (CVE-2023-1281, CVE-2023-1829), permettant \u00e0 un utilisateur local d'\u00e9lever ses privil\u00e8ges dans le syst\u00e8me. Pour mener \u00e0 bien une attaque, des droits pour cr\u00e9er et modifier des classificateurs de trafic sont n\u00e9cessaires, droits accessibles lorsqu'on dispose des permissions CAP_NET_ADMIN, que l'on peut obtenir en ayant la possibilit\u00e9 de cr\u00e9er des espaces de noms d'identificateurs utilisateur (user namespace). Les probl\u00e8mes se manifestent \u00e0 partir du noyau 4.14 et ont \u00e9t\u00e9 corrig\u00e9s dans la branche 6.2. <\/p>\n
Les vuln\u00e9rabilit\u00e9s sont caus\u00e9es par un acc\u00e8s \u00e0 la m\u00e9moire apr\u00e8s sa lib\u00e9ration (use-after-free) dans le code du classificateur de trafic tcindex, faisant partie de la sous-syst\u00e8me QoS (Qualit\u00e9 de service) du noyau Linux. La premi\u00e8re vuln\u00e9rabilit\u00e9 se manifeste en raison d'une condition de course lors de la mise \u00e0 jour de filtres de hash non optimaux, tandis que la deuxi\u00e8me vuln\u00e9rabilit\u00e9 se produit lors de la suppression d'un filtre de hash optimal. Vous pouvez suivre les corrections dans les distributions sur les pages suivantes : Debian, Ubuntu, Gentoo, RHEL, SUSE, Fedora, Gentoo, Arch. Pour bloquer l'exploitation de la vuln\u00e9rabilit\u00e9 par un contournement, vous pouvez d\u00e9sactiver la cr\u00e9ation d'espaces de noms par des utilisateurs non privil\u00e9gi\u00e9s (\u00ab sudo sysctl -w kernel.unprivileged_userns_clone=0 \u00bb). \u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-1281, CVE-2023-1829), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0414\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u0442\u0440\u0435\u0431\u0443\u044e\u0442\u0441\u044f \u043f\u043e\u043b\u043d\u043e\u043c\u043e\u0447\u0438\u044f \u043d\u0430 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0438 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u043a\u043b\u0430\u0441\u0441\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u0442\u0440\u0430\u0444\u0438\u043a\u0430, \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b\u0435 \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u043f\u0440\u0430\u0432 CAP_NET_ADMIN, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432 \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\u044f (user namespace). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 4.14 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0432 \u0432\u0435\u0442\u043a\u0435 6.2. […]<\/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-107817","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\u00e9s dans le sous-syst\u00e8me QoS du noyau Linux, permettant d'\u00e9lever ses privil\u00e8ges dans le syst\u00e8me | ProHoster","description":"Deux vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9tect\u00e9es dans le noyau Linux (CVE-2023-1281, CVE-2023-1829), permettant \u00e0 un utilisateur local d'\u00e9lever ses privil\u00e8ges dans le syst\u00e8me.","canonical_url":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimosti-v-qos-podsisteme-yadra-linux-pozvolyayushhie-podnyat-svoi-privilegii-v-sisteme","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"fr_FR","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 QoS-\u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 | ProHoster","og:description":"\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-1281, CVE-2023-1829), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435.","og:url":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimosti-v-qos-podsisteme-yadra-linux-pozvolyayushhie-podnyat-svoi-privilegii-v-sisteme","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-04-12T16:48:17+00:00","article:modified_time":"2023-04-13T06:25:12+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts\/107817","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/comments?post=107817"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts\/107817\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/media?parent=107817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/categories?post=107817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/tags?post=107817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"