{"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\/it\/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","title":{"rendered":"Vulnerabilit\u00e0 in XFS che consente la lettura di dati raw da un dispositivo a blocchi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00c8 stata individuata una vulnerabilit\u00e0 nel codice del file system XFS (CVE-2021-4155), che consente a un utente locale non privilegiato di leggere direttamente i dati dei blocchi non utilizzati da un dispositivo a blocchi. Tutte le versioni significative del kernel Linux superiori alla 5.16 che contengono il driver XFS sono interessate da questo problema. La correzione \u00e8 stata inclusa nella versione 5.16 e nei kernel aggiornati 5.15.14, 5.10.91, 5.4.171, 4.19.225, ecc. \u00c8 possibile monitorare lo stato della distribuzione degli aggiornamenti che risolvono il problema nelle distribuzioni alle seguenti pagine: Debian, RHEL, SUSE, Fedora, Ubuntu, Arch. <\/p>\n

La vulnerabilit\u00e0 \u00e8 causata da un comportamento errato di due ioctl specifici per XFS (XFS_IOC_ALLOCSP e XFS_IOC_FREESP), che sono l'analogo funzionale della syscall generica fallocate(). Quando si aumenta la dimensione di un file non allineato alla dimensione del blocco, gli ioctl XFS_IOC_ALLOCSP\/XFS_IOC_FREESP non azzerano i byte di coda fino al successivo confine di blocco. Pertanto, su XFS con una dimensione di blocco standard di 4096 byte, un attaccante pu\u00f2 leggere fino a 4095 byte di dati precedentemente scritti da ciascun blocco. Le aree indicate possono contenere dati di file cancellati, file deframmentati e file con blocchi deduplicati. <\/p>\n

\u00c8 possibile verificare se il sistema presenta il problema utilizzando un semplice prototipo di exploit. Se, dopo aver eseguito la sequenza di comandi proposta, riesci a leggere il testo di Shakespeare, il driver del file system \u00e8 vulnerabile. Il montaggio iniziale della partizione XFS per la dimostrazione richiede privilegi di superutente. <\/p>\n

\u041f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 ioctl(XFS_IOC_ALLOCSP) \u0438 ioctl(XFS_IOC_FREESP) \u043f\u043e \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u043d\u0435 \u043e\u0442\u043b\u0438\u0447\u0430\u044e\u0442\u0441\u044f \u043e\u0442 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0433\u043e fallocate(), \u0438 \u0435\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u043c \u0438\u0445 \u043e\u0442\u043b\u0438\u0447\u0438\u0435\u043c \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0443\u0442\u0435\u0447\u043a\u0430 \u0434\u0430\u043d\u043d\u044b\u0445, \u0438\u0445 \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u043f\u043e\u0445\u043e\u0436\u0435 \u043d\u0430 \u0431\u0435\u043a\u0434\u043e\u0440. \u041d\u0435\u0441\u043c\u043e\u0442\u0440\u044f \u043d\u0430 \u043e\u0431\u0449\u0443\u044e \u043f\u043e\u043b\u0438\u0442\u0438\u043a\u0443 – \u043d\u0435 \u0438\u0437\u043c\u0435\u043d\u044f\u0442\u044c \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u044b \u0432 \u044f\u0434\u0440\u0435, – \u043f\u043e \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u044e \u041b\u0438\u043d\u0443\u0441\u0430, \u043f\u0440\u0438\u043d\u044f\u0442\u043e \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u043f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u0443\u0434\u0430\u043b\u0438\u0442\u044c \u044d\u0442\u0438 ioctl’\u044b \u0432 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0432\u0435\u0440\u0441\u0438\u0438.
\n
Fonte: 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-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 Vulnerabilit\u00e0 in XFS che permette di leggere dati grezzi dal dispositivo a blocchi | ProHoster","description":"\u00c8 stata scoperta una vulnerabilit\u00e0 nel codice del file system XFS (CVE-2021-4155) che consente a un utente locale non privilegiato di leggere direttamente i dati dei blocchi inutilizzati dal dispositivo a blocchi. Tutte le versioni principali del kernel Linux superiori a 5.16, che contengono il driver XFS, sono vulnerabili a questo problema. Una correzione \u00e8 stata inclusa nella versione 5.16, cos\u00ec come negli aggiornamenti del kernel 5.15.14, 5.10.91, 5.4.171, 4.19.225, ecc. Stato di formazione degli aggiornamenti per risolvere il problema.","canonical_url":"https:\/\/prohoster.info\/it\/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","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 XFS, \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 \u043d\u0435\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 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