{"id":104585,"date":"2022-07-03T15:36:40","date_gmt":"2022-07-03T13:36:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii"},"modified":"2022-07-03T15:36:40","modified_gmt":"2022-07-03T13:36:40","slug":"lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Lokal s\u00e5rbarhed i nftables, der muligg\u00f8r forh\u00f8jelse af privilegier.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I Netfilter, som er en del af Linux-kernen og bruges til at filtrere og modificere netv\u00e6rkspakker, er der blevet opdaget en s\u00e5rbarhed (CVE ikke tildelt), der g\u00f8r det muligt for en lokal bruger at eksekvere kode p\u00e5 kernel-niveau og h\u00e6ve sine privilegier i systemet. Forskere har demonstreret et exploit, der gjorde det muligt for en lokal bruger at opn\u00e5 root-rettigheder i Ubuntu 22.04 med kernel 5.15.0-39-generic. Oprindeligt var det planlagt at offentligg\u00f8re oplysningerne om s\u00e5rbarheden den 15. august, men p\u00e5 grund af kopieringen af brevet med prototypen af exploit til den offentlige mailingliste blev embargoen p\u00e5 oplysningen annulleret. <\/p>\n

Problemet opst\u00e5r fra version 5.8 og skyldes et buffer-overl\u00f8b i koden til behandling af set-lister i nf_tables-modulet, der opstod p\u00e5 grund af manglende passende kontroller i funktionen nft_set_elem_init. Fejlen blev indf\u00f8rt i en \u00e6ndring, der udvidede lageromr\u00e5det til 128 byte for listeelementer. <\/p>\n

For conducting an attack, access to nftables is required, which can be obtained in a separate network namespace with the CLONE_NEWUSER, CLONE_NEWNS, or CLONE_NEWNET rights (for example, when able to launch an isolated container). A fix is not yet available. To block exploitation of the vulnerability in regular systems, you should ensure that non-privileged users are prohibited from creating namespaces (\"sudo sysctl -w kernel.unprivileged_userns_clone=0\").
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 Netfilter, \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 Linux, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0439 \u0434\u043b\u044f \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u0438 \u043c\u043e\u0434\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE \u043d\u0435 \u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u0438 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er der blevet opdaget en s\u00e5rbarhed (CVE ikke tildelt), der g\u00f8r det muligt for en lokal bruger at eksekvere kode p\u00e5 kernel-niveau og h\u00e6ve sine.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","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\u041b\u043e\u043a\u0430\u043b\u044c\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 nftables, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f 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