{"id":109268,"date":"2023-07-06T03:10:18","date_gmt":"2023-07-06T01:10:18","guid":{"rendered":"https:\/\/prohoster.info\/?p=109268"},"modified":"2023-07-06T09:41:48","modified_gmt":"2023-07-06T07:41:48","slug":"uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Zranitelnost StackRot v j\u00e1d\u0159e Linux, kter\u00e1 umo\u017e\u0148uje zv\u00fd\u0161it sv\u00e9 opr\u00e1vn\u011bn\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

P\u0159evod VMA (Virtual Memory Area) proveden\u00fd v j\u00e1d\u0159e Linux 6.1 ze struktury dat \u201ered-black tree\u201c na \u201emaple tree\u201c vedl k vzniku zranitelnosti (CVE-2023-3269), kter\u00e1 umo\u017e\u0148uje neopr\u00e1vn\u011bn\u00e9mu u\u017eivateli vykonat sv\u016fj k\u00f3d s pr\u00e1vy j\u00e1dra. Zranitelnost, kter\u00e1 nese k\u00f3dov\u00e9 jm\u00e9no StackRot, se projevuje od vyd\u00e1n\u00ed j\u00e1dra 6.1 a byla odstran\u011bna v aktualizac\u00edch 6.4.1, 6.3.11 a 6.1.37. <\/p>\n

Struktura \u201emaple tree\u201c p\u0159edstavuje variantu B-tree, kter\u00e1 podporuje indexaci podle rozsah\u016f hodnot a je navr\u017eena pro efektivn\u00ed vyu\u017eit\u00ed cache modern\u00edch procesor\u016f. Ve srovn\u00e1n\u00ed se \u201ered-black tree\u201c pou\u017e\u00edv\u00e1n\u00ed \u201emaple tree\u201c umo\u017e\u0148uje dos\u00e1hnout vy\u0161\u0161\u00edho v\u00fdkonu. Zranitelnost je zp\u016fsobena chybou v obsluze roz\u0161\u00ed\u0159en\u00ed z\u00e1sobn\u00edku \u2014 ve struktu\u0159e \u201emaple tree\u201c, pou\u017e\u00edv\u00e1n\u00e9 p\u0159i spr\u00e1v\u011b oblast\u00ed virtu\u00e1ln\u00ed pam\u011bti v j\u00e1d\u0159e, mohla p\u0159i v\u00fdm\u011bn\u011b uzlu v strom\u011b nastat situace, kdy do\u0161lo k proveden\u00ed bez z\u00e1mku pro z\u00e1pis, co\u017e vedlo k situaci, kdy do\u0161lo k p\u0159\u00edstupu k oblasti pam\u011bti po jej\u00edm uvoln\u011bn\u00ed (use-after-free). <\/p>\n

Vyu\u017eit\u00ed zranitelnosti bylo zt\u00ed\u017eeno t\u00edm, \u017ee uzly ve struktu\u0159e \u201emaple tree\u201c se uvol\u0148uj\u00ed v odlo\u017een\u00e9m re\u017eimu pomoc\u00ed callbackov\u00fdch vol\u00e1n\u00ed s blokacemi RCU (Read-copy-update). Nicm\u00e9n\u011b, v\u00fdzkumn\u00edk\u016fm se poda\u0159ilo p\u0159ekonat vznikl\u00e9 obt\u00ed\u017ee a p\u0159ipravit funk\u010dn\u00ed exploit, kter\u00fd pl\u00e1nuj\u00ed zve\u0159ejnit koncem \u010dervence, aby u\u017eivatel\u00e9 m\u011bli \u010das aktualizovat sv\u00e9 syst\u00e9my. Vyu\u017eit\u00ed je mo\u017en\u00e9 v t\u00e9m\u011b\u0159 v\u0161ech konfigurac\u00edch j\u00e1dra a vy\u017eaduje pouze minim\u00e1ln\u00ed privilegium.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux 6.1 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 VMA (Virtual Memory Area) \u0441\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 «red-black tree» \u043d\u0430 «maple tree» \u043f\u0440\u0438\u0432\u0451\u043b \u043a \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-3269), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \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 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u044f\u0434\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f StackRot, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u044f\u0434\u0440\u0430 6.1 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 6.4.1, 6.3.11 \u0438 6.1.37. \u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 «maple […]<\/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-109268","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 StackRot v j\u00e1d\u0159e Linux, kter\u00e1 umo\u017e\u0148uje zv\u00fd\u0161it sv\u00e9 privilegium | ProHoster","description":"P\u0159evod VMA (Virtual Memory Area) z datov\u00e9 struktury \"red-black tree\" na \"maple tree\" proveden\u00fd v j\u00e1d\u0159e Linux 6.1 vedl k vzniku zranitelnosti (CVE-2023-3269), kter\u00e1 umo\u017e\u0148uje neopr\u00e1vn\u011bn\u00e9mu u\u017eivateli.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c StackRot \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 | ProHoster","og:description":"\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux 6.1 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 VMA (Virtual Memory Area) \u0441\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 "red-black tree" \u043d\u0430 "maple tree" \u043f\u0440\u0438\u0432\u0451\u043b \u043a \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-3269), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 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