{"id":103411,"date":"2022-02-22T15:37:00","date_gmt":"2022-02-22T13:37:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-podsisteme-netfilter-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux"},"modified":"2022-02-22T15:37:00","modified_gmt":"2022-02-22T13:37:00","slug":"uyazvimost-v-podsisteme-netfilter-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/uyazvimost-v-podsisteme-netfilter-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","title":{"rendered":"Haavatavus netfilter alam-s\u00fcsteemis, mis v\u00f5imaldab k\u00e4itada koodi Linuxi tuumatasemel.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Netfilteris, Linuxi tuuma all oleva s\u00fcsteemi, mis on m\u00f5eldud v\u00f5rgupakettide filtreerimiseks ja muutmiseks, on avastatud haavatavus (CVE-2022-25636), mis v\u00f5imaldab k\u00e4ivitada tuuma tasemel koodi. On teatatud, et on luua eksploidi n\u00e4idis, mis v\u00f5imaldab kohalikul kasutajal t\u00f5sta oma privileege Ubuntu 21.10 juhul, kui KASLR kaitses\u00fcsteem on v\u00e4lja l\u00fclitatud. Probleem ilmneb alates tuumast 5.4. Parandus on saadaval praegu patch'ina (korrektuursed tuuma v\u00e4ljalasked ei ole veel koostatud). Pakettide v\u00e4rskenduste avaldamise j\u00e4lgimiseks jaotustes saab vaadata j\u00e4rgmistel lehtedel: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. <\/p>\n

Haavatavus tuleneb arvutuse veast massiivi flow->rule->action.entries suuruse m\u00e4\u00e4ramisel funktsioonis nft_fwd_dup_netdev_offload (m\u00e4\u00e4ratletud failis net\/netfilter\/nf_dup_netdev.c), mis v\u00f5ib viia r\u00fcndaja kontrollitavate andmete kirjutamiseni m\u00e4lu ala v\u00e4lja eraldatud puhvrist. Viga avaldub \"dup\" ja \"fwd\" reeglite seadistamisel ahelates, kus rakendatakse riistvaralist pakettide t\u00f6\u00f6tlemise kiirendamist (offload). Kuna \u00fclet\u00e4itumine toimub enne paketifilterreeglu loomist ja offload toetamist kontrollimist, kehtib haavatavus ka v\u00f5rgu seadmetele, mis ei toeta riistvaralist kiirendamist, n\u00e4iteks loopback-liides. <\/p>\n

On m\u00e4rgitud, et probleem on suhteliselt kerge \u00e4ra kasutada, kuna puhvrist v\u00e4ljapoole ulatuvad v\u00e4\u00e4rtused v\u00f5ivad kirjutada net_device struktuuri n\u00e4idiku ning j\u00e4lle kirjutatud v\u00e4\u00e4rtuste andmed naasevad kasutajaruumi, mis v\u00f5imaldab teada saada r\u00fcnnaku teostamiseks vajalikud m\u00e4luaadressid. Haavatavuse rakendamiseks on vajalik kindlate reeglite loomine nftables'is, mis on v\u00f5imalik ainult CAP_NET_ADMIN privileegide olemasolu korral, mis v\u00f5ivad saada enamasti privileegita kasutaja poolt eraldi v\u00f5rgu nimede ruumis (network namespaces). Haavatavust saab kasutada ka konteinerite isolatsioonis\u00fcsteemide r\u00fcndamiseks.
\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-2022-25636), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430. \u0417\u0430\u044f\u0432\u043b\u0435\u043d\u043e \u043e \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043a\u0435 \u043f\u0440\u0438\u043c\u0435\u0440\u0430 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \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 Ubuntu 21.10 c \u043e\u0442\u043a\u043b\u044e\u0447\u0451\u043d\u043d\u044b\u043c \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u043e\u043c \u0437\u0430\u0449\u0438\u0442\u044b KASLR. \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 5.4. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u043a\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0432 \u0432\u0438\u0434\u0435 \u043f\u0430\u0442\u0447\u0430 (\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u044f\u0434\u0440\u0430 […]<\/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-103411","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\udd47Netfilteri haavatavus, mis v\u00f5imaldab k\u00e4ivitada koodi Linuxi tuuma tasemel | ProHoster","description":"Netfilteris, Linuxi tuuma all oleva s\u00fcsteemi, mis on m\u00f5eldud v\u00f5rgupakettide filtreerimiseks ja muutmiseks, on avastatud haavatavus (CVE-2022-25636), 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\u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 Linux | ProHoster","og:description":"\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-2022-25636), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 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