{"id":102964,"date":"2022-01-14T21:37:17","date_gmt":"2022-01-14T19:37:17","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-xfs-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d1%87%d0%b8%d1%82%d0%b0%d1%82%d1%8c-%d1%81%d1%8b%d1%80"},"modified":"2022-01-14T21:37:17","modified_gmt":"2022-01-14T19:37:17","slug":"%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-xfs-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d1%87%d0%b8%d1%82%d0%b0%d1%82%d1%8c-%d1%81%d1%8b%d1%80","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-xfs-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d1%87%d0%b8%d1%82%d0%b0%d1%82%d1%8c-%d1%81%d1%8b%d1%80","title":{"rendered":"XFS-i haavatavus, mis v\u00f5imaldab lugeda toore andmeid plokiseadmest","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

XFS-failis\u00fcsteemi koodis avastati haavatavus (CVE-2021-4155), mis v\u00f5imaldab kohalikul madala privileegiga kasutajal lugeda andmeid kasutamata plokkidest otse plokkseadmest. K\u00f5ik olulised Linuxi tuumaversioonid, mis on vanemad kui 5.16 ja sisaldavad XFS draiverit, on selle probleemiga seotud. Parandused on l\u00e4bi viidud versioonis 5.16 ning ka tuumade 5.15.14, 5.10.91, 5.4.171, 4.19.225 jne v\u00e4rskendustes. Uuenduste staatust jaotustes saab j\u00e4lgida j\u00e4rgmiste lehtede kaudu: Debian, RHEL, SUSE, Fedora, Ubuntu, Arch. <\/p>\n

Haavatavus tuleneb kahe XFS-le spetsiifilise ioctl(XFS_IOC_ALLOCSP) ja ioctl(XFS_IOC_FREESP) vale k\u00e4itumise t\u00f5ttu, mis on funktsionaalsed ekvivalendid \u00fcldtuuma s\u00fcsteemikutses fallocate(). Kui faili suurust suurendatakse, mis ei ole ploki suuruse j\u00e4rgi joondatud, siis ioctl XFS_IOC_ALLOCSP\/XFS_IOC_FREESP ei nullita j\u00e4\u00e4nud bite kuni j\u00e4rgmise ploki piirini. Seega saab XFS-i standardse 4096-baidise ploki suurusega r\u00fcndaja lugeda iga ploki kohta kuni 4095 baidi eelnevaid kirjutatud andmeid. M\u00e4rgitud aladel v\u00f5ivad olla kustutatud failide, defragmentitud failide ja deduplikatsioonitud plokkidega failide andmed. <\/p>\n

Probleemi saab kontrollida lihtsa eksploidi protot\u00fc\u00fcbiga. Kui p\u00e4rast ettepanekut j\u00e4rgitavaid k\u00e4skude j\u00e4rjestusi \u00f5nnestub lugeda Shakespeare'i tekste, on failis\u00fcsteemi draiver haavatav. XFS-i sektsiooni esialgne monteerimine demonstreerimiseks n\u00f5uab superkasutaja \u00f5igusi. <\/p>\n

Kuna ioctl(XFS_IOC_ALLOCSP) ja ioctl(XFS_IOC_FREESP) funktsionaalsus on praktiliselt sama nagu standardne fallocate(), ja nende ainus erinevus on andmelekke probleem, n\u00e4ib nende olemasolu olevat tagavara. Vaatamata \u00fcldisele p\u00f5him\u00f5ttele \u2013 mitte muuta olemasolevaid liideseid tuumas \u2013 on Linuse ettepanekul otsustatud j\u00e4rgmises versioonis need ioctl'id t\u00e4ielikult eemaldada.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043a\u043e\u0434\u0435 \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b XFS \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-4155), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \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 \u0447\u0438\u0442\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u043d\u0435\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0431\u043b\u043e\u043a\u043e\u0432 \u043d\u0430\u043f\u0440\u044f\u043c\u0443\u044e \u0441 \u0431\u043b\u043e\u0447\u043d\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430. \u0412\u0441\u0435 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