{"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 tooreid andmeid blokiseadmest","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Failis\u00fcsteemi XFS koodis avastati haavatavus (CVE-2021-4155), mis v\u00f5imaldab kohalikul mitteprivileegitud kasutajal lugeda andmeid kasutamata blokidelt otse blokiseadmest. K\u00f5ik m\u00e4rkimisv\u00e4\u00e4rsed Linuxi tuumaversioonid alates 5.16, mis sisaldavad XFS draiverit, on selle probleemi ohvriks. Parandus oli sisestatud versioonisse 5.16 ning samuti tuumauuendustes 5.15.14, 5.10.91, 5.4.171, 4.19.225 jne. Probleemi lahendamiseks uuenduste koostamise staatust jagatakse j\u00e4rgmiste lehtede kaudu: Debian, RHEL, SUSE, Fedora, Ubuntu, Arch. <\/p>\n

Haavatavus on tingitud kahest XFS-le spetsiifilisest ioctl'ist (XFS_IOC_ALLOCSP ja XFS_IOC_FREESP), mis on funktsionaalsed vasteid \u00fcldkeelse s\u00fcsteemikutsumise fallocate() jaoks. Kui faili suurust suurendatakse, ilma et see oleks plokkide suuruse j\u00e4rgi \u00fchtlaselt jaotatud, ei nullita ioctl XFS_IOC_ALLOCSP\/XFS_IOC_FREESP saba bytes j\u00e4rgmise ploki piirini. Sel moel v\u00f5ib XFS-i standardse 4096-baidise ploki suurusega r\u00fcnnaku korral lugeda kuni 4095 baiti eelnevalt kirjutatud andmeid. Nendes piirkondades v\u00f5ivad olla andmed kustutatud failide, defragmenteeritud failide ja dedupeeritud plokkidega failide kohta. <\/p>\n

S\u00fcsteemi probleemi tuvastamiseks saab kasutada lihtsat eksploitide protot\u00fc\u00fcpi. Kui pakutud k\u00e4suahela t\u00e4itmise j\u00e4rel \u00f5nnestub lugeda Shakespeare'i teksti, on failis\u00fcsteemi draiver haavatav. XFS-i partitsiooni algne mountimine demonstreerimiseks n\u00f5uab superkasutaja \u00f5igusi. <\/p>\n

Kuna ioctl(XFS_IOC_ALLOCSP) ja ioctl(XFS_IOC_FREESP) on funktsionaalsuselt praktiliselt v\u00f5rdsed standardse fallocate() funktsiooniga, ning nende ainus erinevus on andmete leke, on nende olemasolu sarnane tagauksele. Vaatamata \u00fcldisele poliitikale - mitte muuta olemasolevaid liideseid tuumas, - on Linuse ettepaneku p\u00f5hjal otsustatud need ioctl'id j\u00e4rgmises versioonis 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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