{"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\/cs\/blog\/news\/uyazvimost-v-firejail-pozvolyayushhaya-poluchit-root-dostup-v-sisteme","title":{"rendered":"Zranitelnost ve firejail, kter\u00e1 umo\u017e\u0148uje z\u00edsk\u00e1n\u00ed root p\u0159\u00edstupu v syst\u00e9mu.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V n\u00e1stroji pro izolovan\u00e9 spu\u0161t\u011bn\u00ed aplikac\u00ed Firejail byla zji\u0161t\u011bna zranitelnost (CVE-2022-31214), kter\u00e1 umo\u017e\u0148uje m\u00edstn\u00edmu u\u017eivateli z\u00edskat pr\u00e1va root v hlavn\u00edm syst\u00e9mu. Ve voln\u00e9m p\u0159\u00edstupu je k dispozici funk\u010dn\u00ed exploit, ov\u011b\u0159en\u00fd v aktu\u00e1ln\u00edch verz\u00edch openSUSE, Debian, Arch, Gentoo a Fedora se spu\u0161t\u011bn\u00fdm n\u00e1strojem firejail. Probl\u00e9m byl vy\u0159e\u0161en ve verzi firejail 0.9.70. Jako ochrann\u00e9 opat\u0159en\u00ed lze v nastaven\u00ed (\/etc\/firejail\/firejail.config) nastavit parametry \u201ejoin no\u201c a \u201eforce-nonewprivs yes\u201c. <\/p>\n

Firejail pou\u017e\u00edv\u00e1 pro izolaci mechanismus jmenn\u00fdch prostor\u016f (namespaces), AppArmor a filtrov\u00e1n\u00ed syst\u00e9mov\u00fdch vol\u00e1n\u00ed (seccomp-bpf) v Linuxu, ale pro nastaven\u00ed izolovan\u00e9ho spu\u0161t\u011bn\u00ed vy\u017eaduje zv\u00fd\u0161en\u00e1 opr\u00e1vn\u011bn\u00ed, kter\u00e1 z\u00edsk\u00e1v\u00e1 prost\u0159ednictv\u00edm p\u0159ipevn\u011bn\u00ed k n\u00e1stroji s flagem suid root nebo spu\u0161t\u011bn\u00edm pomoc\u00ed sudo. Zranitelnost je zp\u016fsobena chybou v logice fungov\u00e1n\u00ed volby \u201e--join=\u201c, kter\u00e1 je ur\u010dena pro p\u0159ipojen\u00ed k ji\u017e b\u011b\u017e\u00edc\u00edmu izolovan\u00e9mu prost\u0159ed\u00ed (podobn\u011b jako p\u0159\u00edkaz login pro sandboxov\u00e9 prost\u0159ed\u00ed) s ur\u010dov\u00e1n\u00edm prost\u0159ed\u00ed podle b\u011b\u017e\u00edc\u00edho identifik\u00e1toru procesu. Ve f\u00e1zi p\u0159ed odebr\u00e1n\u00edm opr\u00e1vn\u011bn\u00ed firejail ur\u010duje opr\u00e1vn\u011bn\u00ed uveden\u00e9ho procesu a aplikuje je na nov\u00fd proces, p\u0159ipojen\u00fd k prost\u0159ed\u00ed pomoc\u00ed volby \u201e--join\u201c. <\/p>\n

P\u0159ed p\u0159ipojen\u00edm se prov\u00e1d\u00ed kontrola, zda je uveden\u00fd proces spu\u0161t\u011bn v prost\u0159ed\u00ed firejail. Tato kontrola hodnot\u00ed p\u0159\u00edtomnost souboru \/run\/firejail\/mnt\/join. Pro zneu\u017eit\u00ed zranitelnosti m\u016f\u017ee \u00fato\u010dn\u00edk simulovat fiktivn\u00ed neizolovan\u00e9 prost\u0159ed\u00ed firejail pomoc\u00ed prostoru mont\u00e1\u017en\u00edch bod\u016f (mount namespace), a pot\u00e9 se k n\u011bmu p\u0159ipojit pomoc\u00ed volby \u201e--join\u201c. Pokud nen\u00ed v nastaven\u00ed aktivov\u00e1n re\u017eim z\u00e1kazu z\u00edsk\u00e1n\u00ed dal\u0161\u00edch opr\u00e1vn\u011bn\u00ed v nov\u00fdch procesech (prctl NO_NEW_PRIVS), firejail p\u0159ipoj\u00ed u\u017eivatele k fiktivn\u00edmu prost\u0159ed\u00ed a pokus\u00ed se aplikovat nastaven\u00ed jmenn\u00e9ho prostoru identifik\u00e1tor\u016f u\u017eivatel\u016f (user namespace) procesu init (PID 1). <\/p>\n

Nakonec se proces p\u0159ipojen\u00fd prost\u0159ednictv\u00edm «firejail —join» ocitne v p\u016fvodn\u00edm jmenn\u00e9m prostoru u\u017eivatelsk\u00fdch identifik\u00e1tor\u016f s nezm\u011bn\u011bn\u00fdmi privilegii, ale v jin\u00e9m mont\u00e1\u017en\u00edm prostoru, kter\u00fd je pln\u011b kontrolov\u00e1n \u00fato\u010dn\u00edkem. \u00dato\u010dn\u00edk m\u016f\u017ee tak\u00e9 spou\u0161t\u011bt programy setuid-root v vytvo\u0159en\u00e9m mont\u00e1\u017en\u00edm prostoru, co\u017e nap\u0159\u00edklad umo\u017e\u0148uje zm\u011bnit nastaven\u00ed \/etc\/sudoers nebo parametry PAM ve sv\u00e9 souborov\u00e9 hierarchii a z\u00edskat mo\u017enost prov\u00e1d\u011bt p\u0159\u00edkazy s pr\u00e1vy root pomoc\u00ed utilit sudo nebo 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 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442, \u043f\u0440\u043e\u0432\u0435\u0440\u0435\u043d\u043d\u044b\u0439 \u0432 \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 openSUSE, Debian, Arch, Gentoo \u0438 Fedora \u0441 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0443\u0442\u0438\u043b\u0438\u0442\u043e\u0439 firejail. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 firejail 0.9.70. \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u0445\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0443\u0442\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u043c\u043e\u0436\u043d\u043e \u0432\u044b\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0432 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u0445 (\/etc\/firejail\/firejail.config) […]<\/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\udd47Zranitelnost v firejail, kter\u00e1 umo\u017e\u0148uje z\u00edskat root p\u0159\u00edstup v syst\u00e9mu | ProHoster","description":"Ve utilit\u011b pro izolovan\u00e9 prov\u00e1d\u011bn\u00ed aplikac\u00ed Firejail byla zji\u0161t\u011bna zranitelnost (CVE-2022-31214), kter\u00e1 umo\u017e\u0148uje m\u00edstn\u00edmu u\u017eivateli z\u00edskat pr\u00e1va root v hlavn\u00edm 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