{"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\/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","title":{"rendered":"Linuxi s\u00fcdamiku VFS haavatavus, mis v\u00f5imaldab privileegide t\u00f5stmist","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linuxi tuumiku juures, mis pakub Filesystem Context API-d, on tuvastatud haavatavus (CVE-2022-0185), mis v\u00f5imaldab kohalikul kasutajal saavutada root-\u00f5igusi s\u00fcsteemis. Probleemi avastanud teadlane avaldas demonstrooimise, kuidas k\u00e4ivitada kood root-\u00f5igustes Ubuntu 20.04 vaikeseades. Kood, mis n\u00e4itab, kuidas haavatavust \u00e4ra kasutada, plaanitakse n\u00e4dal jooksul avaldada GitHubis, p\u00e4rast seda, kui distributsioonid v\u00e4ljastavad v\u00e4rskenduse haavatavuse parandamiseks. <\/p>\n

Haavatavus esineb funktsioonis legacy_parse_param() VFS-is ja on p\u00f5hjustatud n\u00f5rkadest kontrollidest maksimaalsete parameetrite suuruse osas, mis on esitatud failis\u00fcsteemides, mis ei toeta Filesystem Context API-t. Liiga suure parameetri edastamine v\u00f5ib p\u00f5hjustada t\u00e4isarvumuutuja \u00fclevoolu, mida kasutatakse kirjutatavate andmete suuruse arvutamiseks \u2014 koodis on olemas puhverpiiri kontroll, mis ei toimi, kui size v\u00e4\u00e4rtus \u00fcletab 4094, kuna see viib t\u00e4isarvude \u00fclevooluni (integer underflow), kui 4096 \u2014 2 \u2014 4095 muudetakse unsigned int-iks, saadakse 2147483648. <\/p>\n

Tuvastatud viga lubab spetsiaalselt vormindatud failis\u00fcsteemi pildi p\u00e4ringute korral p\u00f5hjustada puhver\u00fclevoolu ja kirjutada \u00fcle tuuma andmed, mis j\u00e4rgivad reserveeritud m\u00e4lu piirkonda. Haavatavuse \u00e4rakasutamiseks on vajalik CAP_SYS_ADMIN \u00f5iguste olemasolu ehk administraatori \u00f5igused. Probleem on selles, et selliseid \u00f5igusi saab mitterikastatud kasutaja saada isoleeritud konteineris, kui s\u00fcsteemis on aktiveeritud kasutaja identifikaatorite ruumide (user namespaces) tugi. N\u00e4iteks on user namespaces vaikimisi aktiveeritud Ubuntu ja Fedora puhul, kuid mitte Debianis ja RHEL-is (kui konteinerite isoleerimise platvorme ei kasutata). <\/p>\n

Probleem ilmneb alates Linuxi tuumast 5.1 ja on k\u00f5rvaldatud eilsetes v\u00e4rskendustes 5.16.2, 5.15.16, 5.10.93, 5.4.173. Haavatavuse k\u00f5rvaldamise v\u00e4rskendused on juba v\u00e4lja antud RHEL-i, Debiani, Fedora ja Ubuntu jaoks. Parandus pole veel saadaval Arch Linuxis, Gentoo, SUSE ja openSUSE. Kaitsemeetmena s\u00fcsteemide jaoks, mis ei kasuta konteinerite isoleerimist, saab sysctl \u201euser.max_user_namespaces\u201c v\u00e4\u00e4rtuse seada 0: echo \u201euser.max_user_namespaces=0\u201c > \/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-novosti-interneta"],"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\udd47 Haavatavus Linuxi tuuma VFS-is, mis v\u00f5imaldab privileegide t\u00f5stmist | ProHoster","description":"Linuxi tuuma poolt pakutavas API Filesystem Contextis on avastatud haavatavus (CVE-2022-0185), mis v\u00f5imaldab kohalikul kasutajal omandada s\u00fcsteemis root \u00f5igused. Probleemi avastanud teadlane avaldas t\u00f5enduse eksploitatsioonist, mis v\u00f5imaldab k\u00e4ivitada koodi root \u00f5igustes Ubuntu 20.04 vaikekonfiguratsiooniga. 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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 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 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