{"id":104822,"date":"2022-08-13T09:36:55","date_gmt":"2022-08-13T07:36:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-yadre-linux-pozvolyayushhaya-izmenit-soderzhimoe-tmpfs-i-razdelyaemoj-pamyati"},"modified":"2022-08-13T09:36:55","modified_gmt":"2022-08-13T07:36:55","slug":"uyazvimost-v-yadre-linux-pozvolyayushhaya-izmenit-soderzhimoe-tmpfs-i-razdelyaemoj-pamyati","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-izmenit-soderzhimoe-tmpfs-i-razdelyaemoj-pamyati","title":{"rendered":"Zranitelnost v j\u00e1dru Linuxu umo\u017e\u0148uje zm\u011bnit obsah tmpfs a sd\u00edlen\u00e9 pam\u011bti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V j\u00e1dru Linux byla odhalena zranitelnost (CVE-2022-2590), kter\u00e1 umo\u017e\u0148uje neprivilegovan\u00e9mu u\u017eivateli m\u011bnit soubory ve sd\u00edlen\u00e9 pam\u011bti (mmap) a soubory v tmpfs, ani\u017e by m\u011bl pr\u00e1vo na z\u00e1pis do nich, a t\u00edm zv\u00fd\u0161it sv\u00e9 privilegium v syst\u00e9mu. Pro sv\u016fj typ se odhalen\u00fd probl\u00e9m podob\u00e1 zranitelnosti Dirty COW, ale li\u0161\u00ed se t\u00edm, \u017ee je omezen pouze na p\u016fsoben\u00ed na data ve sd\u00edlen\u00e9 pam\u011bti (shmem \/ tmpfs). Probl\u00e9m m\u016f\u017ee b\u00fdt rovn\u011b\u017e vyu\u017eit k modifikaci b\u011b\u017e\u00edc\u00edch spustiteln\u00fdch soubor\u016f, kter\u00e9 pou\u017e\u00edvaj\u00ed sd\u00edlenou pam\u011b\u0165. <\/p>\n

Probl\u00e9m je zp\u016fsoben z\u00e1vodem v podsystemu spr\u00e1vy pam\u011bti, kter\u00fd nast\u00e1v\u00e1 p\u0159i zpracov\u00e1n\u00ed v\u00fdjimky (fault) generovan\u00e9 p\u0159i pokusu o z\u00e1pis do pouze pro \u010dten\u00ed p\u0159\u00edstupn\u00fdch oblast\u00ed ve sd\u00edlen\u00e9 pam\u011bti, zrcadl\u00edc\u00edch se v re\u017eimu COW (copy-on-write mapping). Probl\u00e9m se projevuje od j\u00e1dra 5.16 na syst\u00e9mech s architekturou x86-64 a aarch64 p\u0159i sestavov\u00e1n\u00ed j\u00e1dra s volbou CONFIG_USERFAULTFD=y. Zranitelnost byla odstran\u011bna ve verzi 5.19. P\u0159\u00edklad exploit\u016f pl\u00e1nuj\u00ed zve\u0159ejnit 15. srpna.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-2590), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c \u043e\u0442\u0440\u0430\u0436\u0451\u043d\u043d\u044b\u0435 \u0432 \u043f\u0430\u043c\u044f\u0442\u044c \u0444\u0430\u0439\u043b\u044b (mmap) \u0438 \u0444\u0430\u0439\u043b\u044b \u0432 tmpfs, \u043d\u0435 \u0438\u043c\u0435\u044f \u043f\u0440\u0430\u0432 \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u043d\u0438\u0445, \u0438 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u043e \u0441\u0432\u043e\u0435\u043c\u0443 \u0442\u0438\u043f\u0443 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043d\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u0435\u0442 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c Dirty COW, \u043d\u043e \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u0442\u0435\u043c, \u0447\u0442\u043e \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0432\u043e\u0437\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435\u043c \u043d\u0430 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0440\u0430\u0437\u0434\u0435\u043b\u044f\u0435\u043c\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 (shmem \/ […]<\/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-104822","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 j\u00e1dru Linux, kter\u00e1 umo\u017e\u0148uje m\u011bnit obsah tmpfs a sd\u00edlen\u00e9 pam\u011bti | ProHoster","description":"V j\u00e1dru Linux byla odhalena zranitelnost (CVE-2022-2590), kter\u00e1 umo\u017e\u0148uje neprivilegovan\u00e9mu u\u017eivateli m\u011bnit soubory ve sd\u00edlen\u00e9 pam\u011bti (mmap) a soubory v tmpfs, ani\u017e by m\u011bl pr\u00e1vo na z\u00e1pis do nich, a t\u00edm 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