{"id":104360,"date":"2022-06-12T09:36:50","date_gmt":"2022-06-12T07:36:50","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-firejail-pozvolyayushhaya-poluchit-root-dostup-v-sisteme"},"modified":"2022-06-12T09:36:50","modified_gmt":"2022-06-12T07:36:50","slug":"uyazvimost-v-firejail-pozvolyayushhaya-poluchit-root-dostup-v-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-firejail-pozvolyayushhaya-poluchit-root-dostup-v-sisteme","title":{"rendered":"Zranite\u013enos\u0165 v firejail, ktor\u00e1 umo\u017e\u0148uje z\u00edska\u0165 root pr\u00edstup v syst\u00e9me","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V utilite na izolovan\u00e9 sp\u00fa\u0161\u0165anie aplik\u00e1ci\u00ed Firejail bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2022-31214), ktor\u00e1 umo\u017e\u0148uje lok\u00e1lnemu u\u017e\u00edvate\u013eovi z\u00edska\u0165 opr\u00e1vnenia root v hlavnom syst\u00e9me. Na internete je dostupn\u00fd funk\u010dn\u00fd exploit, overen\u00fd na aktu\u00e1lnych verzi\u00e1ch openSUSE, Debian, Arch, Gentoo a Fedora so nain\u0161talovanou utilitou firejail. Probl\u00e9m bol odstr\u00e1nen\u00fd vo verzii firejail 0.9.70. Ako obch\u00e1dzaj\u00face rie\u0161enie m\u00f4\u017eete nastavi\u0165 v konfigura\u010dnom s\u00fabore (\\\/etc\\\/firejail\\\/firejail.config) parametre \u201ejoin no\u201c a \u201eforce-nonewprivs yes\u201c. <\/p>\n

Firejail vyu\u017e\u00edva na izol\u00e1ciu mechanizmus priestorov mien (namespaces), AppArmor a filtr\u00e1ciu syst\u00e9mov\u00fdch volan\u00ed (seccomp-bpf) v Linuxe, av\u0161ak na nastavenie izolovan\u00e9ho sp\u00fa\u0161\u0165ania vy\u017eaduje vy\u0161\u0161ie privil\u00e9gi\u00e1, ktor\u00e9 z\u00edska prostredn\u00edctvom pripojenia k utilite s praporom suid root alebo spusten\u00edm pomocou sudo. Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 chybou v logike fungovania vo\u013eby \u201e--join=\u201c, ktor\u00e1 je ur\u010den\u00e1 na pripojenie k u\u017e be\u017eiacemu izolovan\u00e9mu prostrediu (podobne ako pr\u00edkaz login pre sandbox prostredie) s ur\u010den\u00edm prostredia pod\u013ea be\u017eiaceho procesu v \u0148om. V \u0161t\u00e1diu pred zru\u0161en\u00edm privil\u00e9gi\u00ed firejail ur\u010duje opr\u00e1vnenia uveden\u00e9ho procesu a aplikuje ich na nov\u00fd proces, pripojen\u00fd k prostrediu pomocou vo\u013eby \u201e--join\u201c. <\/p>\n

Pred pripojen\u00edm sa vykon\u00e1va kontrola, \u010di je uveden\u00fd proces spusten\u00fd v prostred\u00ed firejail. T\u00e1to kontrola hodnot\u00ed pr\u00edtomnos\u0165 s\u00faboru \\\/run\\\/firejail\\\/mnt\\\/join. Na vyu\u017eitie zranite\u013enosti m\u00f4\u017ee \u00fato\u010dn\u00edk simulova\u0165 fikt\u00edvne neizolovan\u00e9 prostredie firejail, vyu\u017e\u00edvaj\u00fac priestor bodov montovania (mount namespace), po \u010dom sa k nemu m\u00f4\u017ee pripoji\u0165 pomocou vo\u013eby \u201e--join\u201c. Ak nie je v nastaveniach aktivovan\u00fd re\u017eim z\u00e1kazu z\u00edskavania \u010fal\u0161\u00edch privil\u00e9gi\u00ed v nov\u00fdch procesoch (prctl NO_NEW_PRIVS), firejail pripoj\u00ed u\u017e\u00edvate\u013ea k fikt\u00edvnemu prostrediu a pok\u00fasi sa aplikova\u0165 nastavenia priestoru mien identifik\u00e1torov pou\u017e\u00edvate\u013eov (user namespace) procesu init (PID 1). <\/p>\n

Pripojen\u00fd proces cez «firejail —join» sa ocitne v p\u00f4vodnej menovej sf\u00e9re pou\u017e\u00edvate\u013ea s nezmenen\u00fdmi privilegiami, ale v inej mont\u00e1\u017enej oblasti, ktorej plne kontroluje \u00fato\u010dn\u00edk. \u00dato\u010dn\u00edk m\u00f4\u017ee vykon\u00e1va\u0165 programy setuid-root vo vytvorenej mont\u00e1\u017enej oblasti, \u010do umo\u017e\u0148uje napr\u00edklad zmeni\u0165 nastavenia \/etc\/sudoers alebo parametre PAM vo svojej s\u00faborovej hierarchii a z\u00edska\u0165 tak mo\u017enos\u0165 vykon\u00e1va\u0165 pr\u00edkazy s pr\u00e1vami root pomocou util\u00edt sudo alebo su.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 \u0434\u043b\u044f \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 Firejail \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-31214), \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\u0430\u0432\u0430 root \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0412 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u0438\u043c\u0435\u0435\u0442\u0441\u044f \u0440\u0430\u0431\u043e\u0447\u0438\u0439 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[…]<\/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-104360","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\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\udd47Zranite\u013enos\u0165 v firejail, ktor\u00e1 umo\u017e\u0148uje z\u00edska\u0165 root-pr\u00edstup v syst\u00e9me | ProHoster","description":"V utilite na izolovan\u00e9 vykon\u00e1vanie aplik\u00e1ci\u00ed Firejail bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2022-31214), ktor\u00e1 umo\u017e\u0148uje lok\u00e1lnemu pou\u017e\u00edvate\u013eovi z\u00edska\u0165 pr\u00e1va roota v hlavnom 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