Nell'implementazione dell'interfaccia di input\/output asincrono io_uring, inclusa nel kernel Linux a partire dalla versione 5.1, \u00e8 stata identificata una vulnerabilit\u00e0 (CVE-2022-29582) che consente a un utente non privilegiato di ottenere diritti root nel sistema, inclusa l'esecuzione di un exploit da un container. La vulnerabilit\u00e0 \u00e8 causata da un accesso a un blocco di memoria gi\u00e0 liberato, ed \u00e8 presente nei kernel Linux a partire dalla branch 5.10 ed \u00e8 stata corretta in aprile con gli aggiornamenti 5.10.111, 5.15.34 e 5.17.3. <\/p>\n
L'accesso alla memoria liberata si verifica a causa di una condizione di gara nella gestione dei timeout nella funzione io_flush_timeouts(), che rimuove la registrazione di un timeout dalla lista e lo annulla, senza verificare la creazione e la rimozione del timeout in quel momento. <\/p>\n
I ricercatori hanno preparato un exploit funzionante, che non richiede l'attivazione degli spazi dei nomi degli identificatori utente (user namespaces) e che pu\u00f2 fornire accesso root nel sistema principale quando l'exploit viene eseguito da un utente non privilegiato in un container isolato. L'exploit funziona anche in un ambiente isolato nsjail nella distribuzione Google COS (Container Optimized OS), basata su Chromium OS e utilizzata da Google Cloud Platform in Compute Engine. L'exploit \u00e8 progettato per funzionare con le branch del kernel dalla 5.10 alla 5.12. macchine virtuali<\/a> Rilascio NetBSD 9.3 \u0412 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 io_uring, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0433\u043e \u0432 \u044f\u0434\u0440\u043e Linux \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 5.1, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-29582), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \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 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u043f\u0440\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 \u0438\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435\u043c \u043a \u0443\u0436\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u043e\u043c\u0443 \u0431\u043b\u043e\u043a\u0443 \u043f\u0430\u043c\u044f\u0442\u0438, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u044f\u0434\u0440\u0430\u0445 Linux \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0442\u043a\u0438 5.10 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0430\u043f\u0440\u0435\u043b\u0435 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 […]<\/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-104786","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\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\udd47Vulnerabilit\u00e0 nel sottosistema io_uring del kernel Linux, che consente di ottenere diritti root da un container | ProHoster","description":"\ud83e\udd47Vulnerabilit\u00e0 nel sottosistema io_uring del kernel Linux, che consente di ottenere diritti root da un container | 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\u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"