{"id":100767,"date":"2021-07-15T16:22:45","date_gmt":"2021-07-15T14:22:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-podsisteme-yadra-linux-netfilter"},"modified":"2021-07-15T16:22:45","modified_gmt":"2021-07-15T14:22:45","slug":"uyazvimost-v-podsisteme-yadra-linux-netfilter","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/uyazvimost-v-podsisteme-yadra-linux-netfilter","title":{"rendered":"Haavatavus Linux Netfilteri tuumaprotokollis","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Netfilteris, Linuxi s\u00fcdamiku alams\u00fcsteem, mida kasutatakse v\u00f5rgupakettide filtreerimiseks ja muutmiseks, tuvastati haavatavus (CVE-2021-22555), mille abil saab kohaliku kasutaja saada s\u00fcsteemis root privileege, sealhulgas ka isoleeritud konteineris. Testimiseks on valmis t\u00f6\u00f6tav eksploitatsiooni protot\u00fc\u00fcp, mis m\u00f6\u00f6dub KASLR, SMAP ja SMEP kaitsemehhanismidest. Haavatavuse avastanud teadlane sai Google'ilt 20 000 dollari suuruse preemia, et paljastada Kubernetes konteinerite isoleerimisest m\u00f6\u00f6das\u00f5idutee kCTF klastris. <\/p>\n

Probleem ilmneb alates 2.6.19 versioonist, mis ilmus 15 aastat tagasi, ja on p\u00f5hjustatud IPT_SO_SET_REPLACE ja IP6T_SO_SET_REPLACE t\u00f6\u00f6tlemisvigadest, mis toovad kaasa puhverserveri \u00fclevoolu spetsiaalselt vormindatud parameetrite saatmise kaudu compat re\u017eiimis setsockopt'i kutsumise ajal. Tavalistes tingimustes saab compat_setsockopt() funktsiooni kutsuda ainult root kasutaja, kuid r\u00fcnnakuks vajalikud volitused v\u00f5ivad samuti saada mitteprivilegeeritud kasutaja s\u00fcsteemides, kus on lubatud kasutaja identiteedi ruumide (user namespaces) tugi. <\/p>\n

Kasutaja saab luua konteineri eraldi root kasutajaga ja kasutada selles haavatavust. N\u00e4iteks on «kasutaja nimed» vaikimisi lubatud Ubuntu ja Fedora, kuid mitte lubatud Debianis ja RHEL-is. Haavatavuse parandav patch on lisatud Linuxi tuumasse 13. aprillil. Pakettide uuendused on juba valminud Debian, Arch Linux ja Fedora projektides. Ubuntu, RHEL ja SUSE uuendused on ettevalmistamisel. <\/p>\n

Probleem tekib funktsioonis xt_compat_target_from_user() vale m\u00e4lu suuruse arvutamise t\u00f5ttu kernelistruktuuride salvestamisel 32-bitise kujundi muutmise ajal 64-bitiseks. Viga lubab kirjutada neli nullbaiti mis tahes positsioonile, mis j\u00e4\u00e4b eraldatud puhvari piiridest v\u00e4ljapoole, mille nihke v\u00e4\u00e4rtus on 0x4C. Antud v\u00f5imalus osutus piisavaks, et luua eksploite, mis lubas saada root \u00f5igusi \u2014 nullides m_list->next n\u00e4itaja msg_msg struktuuris loodi tingimused andmete juurde p\u00e4\u00e4semiseks p\u00e4rast m\u00e4lu vabastamist (use-after-free), mida seej\u00e4rel kasutati aadresside teabe saamiseks ja teiste struktuuride muutmiseks, manipuleerides s\u00fcsteemi k\u00f5ne msgsnd().
\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-2021-22555), \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 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0441\u044c \u0432 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0435. \u0414\u043b\u044f \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d \u0440\u0430\u0431\u043e\u0447\u0438\u0439 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430, \u043e\u0431\u0445\u043e\u0434\u044f\u0449\u0438\u0439 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u044b \u0437\u0430\u0449\u0438\u0442\u044b KASLR, SMAP \u0438 SMEP. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c, \u0432\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u043b\u0443\u0447\u0438\u043b \u043e\u0442 Google \u0432\u043e\u0437\u043d\u0430\u0433\u0440\u0430\u0436\u0434\u0435\u043d\u0438\u0435, \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c 20 \u0442\u044b\u0441\u044f\u0447 \u0434\u043e\u043b\u043b\u0430\u0440\u043e\u0432, \u0437\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-100767","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\udd47Linuxi tuuma Netfilteri haavatavus | ProHoster","description":"Netfilteris, Linuxi tuuma alam-s\u00fcsteem, mida kasutatakse v\u00f5rgupakettide filtreerimiseks ja muutmiseks, avastati haavatavus 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