{"id":103053,"date":"2022-01-21T15:36:44","date_gmt":"2022-01-21T13:36:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-vfs-%d1%8f%d0%b4%d1%80%d0%b0-linux-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d0%bf%d0%be%d0%b2%d1%8b"},"modified":"2022-01-21T15:36:44","modified_gmt":"2022-01-21T13:36:44","slug":"%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-vfs-%d1%8f%d0%b4%d1%80%d0%b0-linux-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d0%bf%d0%be%d0%b2%d1%8b","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-vfs-%d1%8f%d0%b4%d1%80%d0%b0-linux-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d0%bf%d0%be%d0%b2%d1%8b","title":{"rendered":"Linuxi VFS tuuma haavatavus, mis v\u00f5imaldab t\u00f5sta oma \u00f5igusi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linuxi tuuma kaudu pakutud API Filesystem Contextis on avastatud kahjustus (CVE-2022-0185), mis v\u00f5imaldab kohalikel kasutajatel saada root-\u00f5igusi s\u00fcsteemis. Probleemi avastanud teadlane on avaldanud t\u00f5endi, mis demonstreerib exploiti, mille abil on v\u00f5imalik t\u00e4ita koodi root-\u00f5igustes Ubuntu 20.04 vaikeseades. Exploiti plaanitakse paigutada GitHubi n\u00e4dal jooksul p\u00e4rast seda, kui distributsioonid vabastavad v\u00e4rskenduse turvaaugu kohandamiseks. <\/p>\n

Haavatavus esineb funktsioonis legacy_parse_param() VFS-is ning see tuleneb n\u00f5uetekohase kontrolli puudumisest maksimaalse suuruse osas, mida pakutakse failis\u00fcsteemide kaudu, mis ei toeta API Filesystem Contexti. Kui edastada liiga suur parameeter, v\u00f5ib see p\u00f5hjustada tervete arvude muutujate \u00fclet\u00e4itumise, mida kasutatakse kirjutatavate andmete suuruse arvutamiseks \u2013 koodis on olemas puhverduspiiri \u00fcletamise kontroll «if (len > PAGE_SIZE — 2 — size)», mis ei t\u00f6\u00f6ta, kui size v\u00e4\u00e4rtus on suurem kui 4094, kuna tekib tervete arvude \u00fclet\u00e4itumine alumise piiri kaudu (integer underflow, muutes 4096 — 2 — 4095 unsigned int-iks, saadakse 2147483648). <\/p>\n

Antud viga v\u00f5imaldab juurdep\u00e4\u00e4sul spetsiaalselt vormindatud failis\u00fcsteemile p\u00f5hjustada pufferi \u00fclevoolu ja kirjutada \u00fcle tuuma andmed, mis j\u00e4rgivad eraldatud m\u00e4lu piirkonda. Kahjustuse \u00e4rakasutamiseks on vajalik CAP_SYS_ADMIN \u00f5iguste olemasolu, s.t. administraatori volitused. Probleem on, et sarnaseid volitusi v\u00f5ib mitteprivilegeeritud kasutaja saada isoleeritud konteineris, kui s\u00fcsteemis on aktiivne kasutaja nime ruumide (user namespaces) toetus. N\u00e4iteks on user namespaces vaikimisi aktiveeritud Ubuntus ja Fedoras, kuid ei ole lubatud Debiani ja RHEL-i puhul (kui ei kasutata konteinerite isoleerimise platvorme). <\/p>\n

Probleem ilmneb alates Linuxi kerneli versioonist 5.1 ja see on parandatud eilsetes uuendustes 5.16.2, 5.15.16, 5.10.93, 5.4.173. Haavatavust parandavate pakettide uuendused on juba v\u00e4lja antud RHEL-i, Debian'i, Fedora ja Ubuntu jaoks. Parandus pole veel saadaval Arch Linuxis, Gentoo's, SUSE-is ja openSUSE-is. Kaitse \u00fcmberkehastamise jaotuseks, mis ei kasuta konteinerite isoleerimist, on v\u00f5imalik seadistada sysctl 'user.max_user_namespaces' v\u00e4\u00e4rtus 0-ks: echo 'user.max_user_namespaces=0' > \/etc\/sysctl.d\/userns.conf # sysctl -p \/etc\/sysctl.d\/userns.conf
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 API Filesystem Context, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u044b\u043c \u044f\u0434\u0440\u043e\u043c Linux, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-0185), \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 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u0430\u0432 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0412\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0430\u0446\u0438\u044e \u0440\u0430\u0431\u043e\u0442\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0432 Ubuntu 20.04 \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u041a\u043e\u0434 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0440\u0430\u0437\u043c\u0435\u0441\u0442\u0438\u0442\u044c \u043d\u0430 GitHub \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 \u043d\u0435\u0434\u0435\u043b\u0438, \u043f\u043e\u0441\u043b\u0435 \u0442\u043e\u0433\u043e \u043a\u0430\u043a \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u044b \u0432\u044b\u043f\u0443\u0441\u0442\u044f\u0442 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u0441 […]<\/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-103053","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 VFS haavatavus, mis v\u00f5imaldab privileegide t\u00f5stmist | ProHoster","description":"Linuxi tuuma pakutavas API Filesystem Contextis tuvastati haavatavus (CVE-2022-0185), mis v\u00f5imaldab kohalikel kasutajatel taotleda root \u00f5igusi 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