{"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\/hu\/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":"S\u00e9r\u00fcl\u00e9kenys\u00e9g az XFS-ben, amely lehet\u0151v\u00e9 teszi nyers adatok olvas\u00e1s\u00e1t a blokkeszk\u00f6zb\u0151l","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Az XFS f\u00e1jlrendszer k\u00f3dj\u00e1ban egy sebezhet\u0151s\u00e9get fedeztek fel (CVE-2021-4155), amely lehet\u0151v\u00e9 teszi egy helyi, nem privilegiz\u00e1lt felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra, hogy k\u00f6zvetlen\u00fcl olvassa az \u00fcres blokkok adatait a blokkeszk\u00f6zr\u0151l. Minden jelent\u0151s Linux kernel verzi\u00f3, amely a 5.16-os verzi\u00f3 felett tal\u00e1lhat\u00f3, \u00e9s tartalmazza az XFS drivert, \u00e9rintett e probl\u00e9ma \u00e1ltal. A jav\u00edt\u00e1s a 5.16-os verzi\u00f3ba ker\u00fclt be, valamint a 5.15.14, 5.10.91, 5.4.171, 4.19.225 stb. kernel friss\u00edt\u00e9sekbe. Az el\u00e9rhet\u0151 friss\u00edt\u00e9sek \u00e1llapot\u00e1t a k\u00f6vetkez\u0151 oldalakon lehet nyomon k\u00f6vetni: Debian, RHEL, SUSE, Fedora, Ubuntu, Arch. <\/p>\n

A sebezhet\u0151s\u00e9get az XFS-re jellemz\u0151 k\u00e9t ioctl (XFS_IOC_ALLOCSP) \u00e9s ioctl (XFS_IOC_FREESP) helytelen m\u0171k\u00f6d\u00e9se okozza, amelyek a standard kernel rendszerh\u00edv\u00e1s fallocate() funkcion\u00e1lis megfelel\u0151je. F\u00e1jlm\u00e9ret n\u00f6vel\u00e9sekor, amely nem blokkm\u00e9retre van igaz\u00edtva, az ioctl XFS_IOC_ALLOCSP\/XFS_IOC_FREESP nem null\u00e1zza az utols\u00f3 b\u00e1jtokat a k\u00f6vetkez\u0151 blokk hat\u00e1r\u00e1ig. \u00cdgy az XFS eset\u00e9n, ahol a standard blokk m\u00e9rete 4096 byte, a t\u00e1mad\u00f3 ak\u00e1r 4095 byte kor\u00e1bbi adatot is elolvashat az egyes blokkokb\u00f3l. Az eml\u00edtett ter\u00fcleteken t\u00f6r\u00f6lt f\u00e1jlok, t\u00f6redezett f\u00e1jlok, valamint deduplik\u00e1lt blokkokkal rendelkez\u0151 f\u00e1jlok adatai tal\u00e1lhat\u00f3k. <\/p>\n

A probl\u00e9ma ellen\u0151rz\u00e9s\u00e9re egy egyszer\u0171 exploit protot\u00edpus seg\u00edts\u00e9g\u00e9vel lehet\u0151s\u00e9ge van. Ha a javasolt parancsok v\u00e9grehajt\u00e1sa ut\u00e1n siker\u00fcl elolvasni Shakespeare sz\u00f6veg\u00e9t, akkor a f\u00e1jlrendszer drivere sebezhet\u0151. Az XFS part\u00edci\u00f3 kezdeti csatlakoztat\u00e1sa a bemutat\u00f3hoz root jogosults\u00e1gokat ig\u00e9nyel. <\/p>\n

Mivel az ioctl(XFS_IOC_ALLOCSP) \u00e9s az ioctl(XFS_IOC_FREESP) funkcion\u00e1lisan szinte nem k\u00fcl\u00f6nb\u00f6znek a szabv\u00e1nyos fallocate()-t\u00f3l, \u00e9s az egyetlen k\u00fcl\u00f6nbs\u00e9g\u00fck az adatsziv\u00e1rg\u00e1s, a jelenl\u00e9t\u00fck \u00fagy t\u0171nik, mint egy h\u00e1ts\u00f3 ajt\u00f3. A Linus \u00e1ltal javasolt \u00e1ltal\u00e1nos ir\u00e1nyelv \u2013 hogy ne m\u00f3dos\u00edtsuk a megl\u00e9v\u0151 interf\u00e9szeket a kernelben \u2013 ellen\u00e9re \u00fagy d\u00f6nt\u00f6ttek, hogy a k\u00f6vetkez\u0151 verzi\u00f3ban teljesen elt\u00e1vol\u00edtj\u00e1k ezeket az ioctl-okat.
\n
Forr\u00e1s: 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 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 Linux \u0441\u0442\u0430\u0440\u0448\u0435 5.16, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0438\u0435 \u0434\u0440\u0430\u0439\u0432\u0435\u0440 XFS, \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u044d\u0442\u043e\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0435. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0432\u043e\u0448\u043b\u043e \u0432 \u0432\u0435\u0440\u0441\u0438\u044e 5.16, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u044f\u0434\u0435\u0440 5.15.14, 5.10.91, 5.4.171, 4.19.225 \u0438 \u0442.\u0434. \u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b […]<\/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-102964","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\udd47Sebezhet\u0151s\u00e9g az XFS-ben, amely lehet\u0151v\u00e9 teszi nyers adatok olvas\u00e1s\u00e1t a blokkeszk\u00f6zr\u0151l | ProHoster","description":"Az XFS f\u00e1jlrendszer k\u00f3dj\u00e1ban egy sebezhet\u0151s\u00e9get fedeztek fel (CVE-2021-4155), amely lehet\u0151v\u00e9 teszi egy helyi, nem 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\u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0447\u0438\u0442\u0430\u0442\u044c \u0441\u044b\u0440\u044b\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0431\u043b\u043e\u0447\u043d\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 | ProHoster","og:description":"\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 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