{"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\/et\/blog\/news\/lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Kohalik haavatavus nftables, mis v\u00f5imaldab t\u00f5sta privileege","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Netfilteris, Linuxi kernelis, mis kasutatakse v\u00f5rgupakettide filtreerimiseks ja muutmiseks, on avastatud haavatavus (CVE ei ole m\u00e4\u00e4ratud), mis v\u00f5imaldab kohalikul kasutajal k\u00e4ivitada tuumakoodi ja t\u00f5sta enda privileege s\u00fcsteemis. Uurijad demonstreerisid eksploitatsiooni, mis v\u00f5imaldas kohalikel kasutajatel saada root \u00f5igused Ubuntu 22.04 peal versiooniga 5.15.0-39-generic. Algul oli kavas avaldada teave haavatavuse kohta 15. augustil, kuid p\u00e4rast eksploit protot\u00fc\u00fcbi koopia jagamist avalikus postilistis, t\u00fchistati teabe avaldamise embargo. <\/p>\n

Probleem ilmneb alates kernel versioonist 5.8 ja on p\u00f5hjustatud puhversettide \u00fclevoolust nf_tables moodulis, mis tekib piisavate kontrollide puudumise t\u00f5ttu nft_set_elem_init funktsioonis. Viga sai sisseviidud muudatusega, mis laiendas elementide salvestusala 128 baitini. <\/p>\n

R\u00fcnnaku l\u00e4biviimiseks on vajalik juurdep\u00e4\u00e4s nftables'ile, mille saab eraldi v\u00f5rguruumi nimede (network namespaces) abil, kui on olemas \u00f5igused CLONE_NEWUSER, CLONE_NEWNS v\u00f5i CLONE_NEWNET (n\u00e4iteks kui on v\u00f5imalus k\u00e4ivitada isoleeritud konteiner). Praeguseks pole parandust saadaval. Kuni haavatavuse \u00e4rakasutamise takistamiseks tavap\u00e4rastes s\u00fcsteemides tuleks veenduda, et mittet\u00e4iendatud kasutajate nimede ruumide loomise v\u00f5imalus on keelatud (\"sudo sysctl -w kernel.unprivileged_userns_clone=0\").
\n
Allikas: 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 \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. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442, \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0432\u0448\u0438\u0439 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 Ubuntu 22.04 \u0441 \u044f\u0434\u0440\u043e\u043c 5.15.0-39-generic. \u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043b\u043e\u0441\u044c \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u0442\u044c 15 \u0430\u0432\u0433\u0443\u0441\u0442\u0430, \u043d\u043e […]<\/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-104585","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\udd47Kohalik haavatavus nftables, mis v\u00f5imaldab t\u00f5sta privileege | ProHoster","description":"Netfilteris, Linuxi kernelis, mis kasutatakse v\u00f5rgupakettide filtreerimiseks ja muutmiseks, on avastatud haavatavus (CVE ei ole m\u00e4\u00e4ratud), mis v\u00f5imaldab kohalikul kasutajal k\u00e4ivitada tuumakoodi ja t\u00f5sta enda privileege.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/news\/lokalnaya-uyazvimost-v-nftables-pozvolyayushhaya-povysit-svoi-privilegii","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","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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