{"id":103645,"date":"2022-03-29T15:37:18","date_gmt":"2022-03-29T13:37:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec"},"modified":"2022-03-29T15:37:18","modified_gmt":"2022-03-29T13:37:19","slug":"v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","title":{"rendered":"Exploaterbara s\u00e5rbarheter har identifierats i nf_tables, watch_queue och IPsec i Linux-k\u00e4rnan.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Flera farliga s\u00e5rbarheter har uppt\u00e4ckts i Linux-k\u00e4rnan, som g\u00f6r det m\u00f6jligt f\u00f6r en lokal anv\u00e4ndare att \u00f6ka sina privilegier i systemet. Arbetsprototyper av exploiter har f\u00f6rberetts f\u00f6r alla aktuella problem.    <\/p>\n<ul>\n<li class=\"l\"> S\u00e5rbarhet (CVE-2022-0995) i h\u00e4ndelsesp\u00e5rningssystemet watch_queue, vilket leder till skrivning av data i k\u00e4rnminnesomr\u00e5den utanf\u00f6r den tilldelade bufferten. En attack kan utf\u00f6ras av vilken icke-privilegerad anv\u00e4ndare som helst och leda till k\u00f6rning av egen kod med kernelbeh\u00f6righeter. S\u00e5rbarheten finns i funktionen watch_queue_set_size() och \u00e4r kopplad till f\u00f6rs\u00f6ket att rensa alla pekare i listan, \u00e4ven om inget minne har tilldelats f\u00f6r dem. Problemet uppst\u00e5r vid byggnation av k\u00e4rnan med alternativet \"CONFIG_WATCH_QUEUE=y\", vilket anv\u00e4nds i de flesta Linux-distributioner.\n<p>S\u00e5rbarheten \u00e5tg\u00e4rdades i en \u00e4ndring som lagts till k\u00e4rnan den 11 mars. Uppdateringar av paket i distributioner kan f\u00f6ljas p\u00e5 dessa sidor: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. En fungerande exploiter finns redan offentligt tillg\u00e4nglig och g\u00f6r det m\u00f6jligt att f\u00e5 root-\u00e5tkomst n\u00e4r den k\u00f6rs i Ubuntu 21.10 med k\u00e4rnan 5.13.0-37.      <center><img decoding=\"async\" alt=\"Exploaterbara s\u00e5rbarheter har identifierats i nf_tables, watch_queue och IPsec i Linux-k\u00e4rnan.\" src=\"\/wp-content\/uploads\/2022\/03\/9cdfd5bdf66d257757d1a4c600b96249.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<li class=\"l\"> S\u00e5rbarhet (CVE-2022-27666) i k\u00e4rnmodulerna esp4 och esp6 med implementation av ESP-transformationer (Encapsulating Security Payload) f\u00f6r IPsec, som anv\u00e4nds vid anv\u00e4ndning av IPv4 och IPv6. S\u00e5rbarheten m\u00f6jligg\u00f6r f\u00f6r en lokal anv\u00e4ndare med vanliga privilegier att \u00f6verskrida objekt i k\u00e4rnans minne och \u00f6ka sina privilegier i systemet. Problemet orsakas av bristen p\u00e5 \u00f6verensst\u00e4mmelse mellan den tilldelade minnesstorleken och de faktiska mottagna data, d\u00e5 den maximala meddelandestorleken kan \u00f6verskrida den maximala minnesstorleken som tilldelats f\u00f6r strukturen skb_page_frag_refill.\n<p>S\u00e5rbarheten \u00e5tg\u00e4rdades i k\u00e4rnan den 7 mars (fixad i 5.17, 5.16.15 osv.). Uppdateringar av paket i distributioner kan f\u00f6ljas p\u00e5 dessa sidor: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. En fungerande exploiter som g\u00f6r det m\u00f6jligt f\u00f6r en vanlig anv\u00e4ndare att f\u00e5 root-\u00e5tkomst i Ubuntu Desktop 21.10 i standardkonfigurationen har redan publicerats p\u00e5 GitHub. Det p\u00e5st\u00e5s att exploiteren kommer att fungera \u00e4ven i Fedora och Debian med sm\u00e5 \u00e4ndringar. Det \u00e4r v\u00e4rt att notera att exploiteren ursprungligen bereddes f\u00f6r t\u00e4vlingen pwn2own 2022, men k\u00e4rnutvecklarna uppt\u00e4ckte och \u00e5tg\u00e4rdade en relaterad bugg, s\u00e5 det beslutades att avsl\u00f6ja detaljerna kring s\u00e5rbarheten.      <center>  <video controls=\"\" style=\"width: 720px; height: 480px; max-width:100%\" src=\"https:\/\/etenal.me\/wp-content\/uploads\/2022\/03\/yes_root.mp4\" ><source src=\"https:\/\/etenal.me\/wp-content\/uploads\/2022\/03\/yes_root.mp4\" type=\"video\/mp4\"><\/video><\/center>    <\/p>\n<li class=\"l\"> Tv\u00e5 s\u00e5rbarheter (CVE-2022-1015, CVE-2022-1016) i netfilter subsystemet i nf_tables-modulen som m\u00f6jligg\u00f6r drift av paketfiltret nftables. Det f\u00f6rsta problemet till\u00e5ter en lokal, icke-privilegierad anv\u00e4ndare att \u00e5stadkomma en skrivning utanf\u00f6r den tilldelade bufferten i stacken. \u00d6verskridningen intr\u00e4ffar vid hantering av uttryck i nftables som \u00e4r formaterade p\u00e5 ett visst s\u00e4tt och som hanteras under verifieringssteget av index definierat av anv\u00e4ndaren som har tillg\u00e5ng till nftables-regler.\n<p>S\u00e5rbarheten orsakas av att utvecklarna antog att v\u00e4rdet \"enum nft_registers reg\" \u00e4r en byte, medan kompilatorn, vid aktivering av vissa optimeringar, enligt specifikationen C89 kan anv\u00e4nda ett 32-bitarsv\u00e4rde f\u00f6r det. P\u00e5 grund av denna egenskap st\u00e4mmer storleken som anv\u00e4nds vid kontroll och minnesallokering inte \u00f6verens med den faktiska storleken p\u00e5 data i strukturen, vilket leder till att svansen av strukturen \u00f6verlappar pekare i stacken.    <\/p>\n<p>Problemet kan utnyttjas f\u00f6r att k\u00f6ra egen kod p\u00e5 k\u00e4rnniv\u00e5, men f\u00f6r en framg\u00e5ngsrik attack kr\u00e4vs \u00e5tkomst till nftables, vilket kan uppn\u00e5s i ett separat n\u00e4tverksnamnrum (network namespaces) om man har r\u00e4tt CLONE_NEWUSER eller CLONE_NEWNET (till exempel vid m\u00f6jlighet att k\u00f6ra en isolerad beh\u00e5llare). S\u00e5rbarheten \u00e4r ocks\u00e5 n\u00e4ra kopplad till de optimeringar som kompilatorn till\u00e4mpar, som till exempel aktiveras vid kompilering i l\u00e4get \"CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y\". Utnyttjande av s\u00e5rbarheten \u00e4r m\u00f6jligt fr\u00e5n och med Linux-k\u00e4rnan 5.12.    <\/p>\n<p>Den andra s\u00e5rbarheten i netfilter orsakas av \u00e5tkomst till ett redan frigivet minnesomr\u00e5de (use-after-free) i nft_do_chain-hanteraren och kan leda till l\u00e4ckage av icke-initialiserade minnesomr\u00e5den i k\u00e4rnan, som kan l\u00e4sas genom manipulation av nftables-uttryck och anv\u00e4ndas, till exempel f\u00f6r att best\u00e4mma adressen f\u00f6r pekare vid utveckling av exploiter f\u00f6r andra s\u00e5rbarheter. Utnyttjande av s\u00e5rbarheten \u00e4r m\u00f6jligt med Linux-k\u00e4rna 5.13 och senare.    <\/p>\n<p>S\u00e5rbarheterna har \u00e5tg\u00e4rdats i dagens korrigerande uppdateringar av k\u00e4rnorna 5.17.1, 5.16.18, 5.15.32, 5.10.109, 5.4.188, 4.19.237, 4.14.274 och 4.9.309. Uppdateringar av paket i distributionerna kan f\u00f6ljas p\u00e5 dessa sidor: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Forskaren som uppt\u00e4ckte problemen har meddelat att arbets-exploiter f\u00f6r b\u00e5da s\u00e5rbarheterna kommer att publiceras om n\u00e5gra dagar, efter att distributionerna har sl\u00e4ppt paketuppdateringar med k\u00e4rnan.      <\/ul>\n<p>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56931\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043e\u043f\u0430\u0441\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\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 \u0432\u0441\u0435\u0445 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u044b \u0440\u0430\u0431\u043e\u0447\u0438\u0435 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-0995) \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0431\u044b\u0442\u0438\u0439 watch_queue, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u043e\u043c \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430. \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u043b\u044e\u0431\u044b\u043c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0438 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0437\u0430\u043f\u0443\u0441\u043a\u0443 \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103646,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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Arbetsprototyper av exploiter har f\u00f6rberetts f\u00f6r alla aktuella problem.","canonical_url":"https:\/\/prohoster.info\/sv\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sv_SE","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\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u044b\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 nf_tables, watch_queue 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