Nel modulo ksmbd, che include un'implementazione del server file basato sul protocollo SMB incorporata nel kernel Linux, \u00e8 stata identificata una vulnerabilit\u00e0 critica che consente l'esecuzione remota del proprio codice con i privilegi del kernel. L'attacco pu\u00f2 essere effettuato senza autenticazione, basta che il modulo ksmbd sia attivato sul sistema. Il problema si manifesta a partire dal kernel 5.15, rilasciato a novembre 2021, ed \u00e8 stato corretto senza rumore in aggiornamenti 5.15.61, 5.18.18 e 5.19.2, rilasciati ad agosto 2022. Poich\u00e9 l'identificatore CVE per il problema non \u00e8 ancora stato assegnato, non ci sono informazioni precise sulla risoluzione del problema nelle distribuzioni. <\/p>\n
I dettagli sull'esploitazione della vulnerabilit\u00e0 non sono ancora stati rivelati, si sa solo che la vulnerabilit\u00e0 \u00e8 causata dall'accesso a un'area di memoria gi\u00e0 liberata (Use-After-Free) a causa della mancanza di controllo sull'esistenza dell'oggetto prima di eseguire operazioni con esso. Il problema \u00e8 legato al fatto che nella funzione smb2_tree_disconnect() veniva liberata la memoria allocata per la struttura ksmbd_tree_connect, ma successivamente rimaneva ancora un puntatore, utilizzato nella gestione di alcune richieste esterne contenenti comandi SMB2_TREE_DISCONNECT. <\/p>\n
Oltre alla vulnerabilit\u00e0 sopra menzionata, nel ksmbd sono stati corretti anche 4 problemi meno gravi: <\/p>\n
Il supporto per l'esecuzione di un server SMB tramite il modulo ksmbd \u00e8 presente nel pacchetto Samba a partire dalla versione 4.16.0. A differenza del server SMB che opera nello spazio utente, ksmbd \u00e8 pi\u00f9 efficiente in termini di prestazioni, consumo di memoria e integrazione con funzionalit\u00e0 avanzate del kernel. Ksmbd \u00e8 presentato come un'estensione ad alte prestazioni e pronta per l'uso su dispositivi embedded di Samba, integrabile se necessario con strumenti e librerie di Samba. Gli autori del codice ksmbd sono Namjae Jeon di Samsung e Hyunchul Lee di LG, mentre il supporto all'interno del kernel \u00e8 gestito da Steve French di Microsoft, mantenitore del sottosistema CIFS\/SMB2\/SMB3 nel kernel Linux e storico membro del team di sviluppatori di Samba, che ha dato un contributo significativo all'implementazione del supporto per i protocolli SMB\/CIFS in Samba e Linux. \u0412 \u043c\u043e\u0434\u0443\u043b\u0435 ksmbd, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u043c \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u0443\u044e \u0432 \u044f\u0434\u0440\u043e Linux \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SMB, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u044f\u0434\u0440\u0430. \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0430 \u0431\u0435\u0437 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0447\u0442\u043e\u0431\u044b \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0431\u044b\u043b \u0430\u043a\u0442\u0438\u0432\u0438\u0440\u043e\u0432\u0430\u043d \u043c\u043e\u0434\u0443\u043b\u044c ksmbd. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 5.15, \u0432\u044b\u043f\u0443\u0449\u0435\u043d\u043d\u043e\u0433\u043e \u0432 \u043d\u043e\u044f\u0431\u0440\u0435 2021 \u0433\u043e\u0434\u0430, \u0438 \u0431\u0435\u0437 \u043b\u0438\u0448\u043d\u0435\u0439 […]<\/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-106241","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 modulo ksmbd del kernel Linux, che consente 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"