\u00c8 stata identificata una vulnerabilit\u00e0 critica nel modulo ksmbd, che include un'implementazione integrata nel kernel Linux di un server file basato sul protocollo SMB, consentendo l'esecuzione remota di codice con i privilegi del kernel. L'attacco pu\u00f2 essere effettuato senza autenticazione, \u00e8 sufficiente 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 risolto silenziosamente negli aggiornamenti 5.15.61, 5.18.18 e 5.19.2, rilasciati ad agosto 2022. Poich\u00e9 non \u00e8 stato ancora assegnato un identificativo CVE al problema, non ci sono informazioni precise sulla risoluzione in diverse distribuzioni. <\/p>\n
I dettagli sull'esploit della vulnerabilit\u00e0 non sono ancora stati divulgati; si sa solo che \u00e8 causata da un accesso a una memoria gi\u00e0 liberata (Use-After-Free) a causa della mancanza di verifica dell'esistenza dell'oggetto prima di eseguire operazioni su di 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 un puntatore utilizzato nella gestione di specifiche richieste esterne contenenti comandi SMB2_TREE_DISCONNECT rimaneva ancora attivo. <\/p>\n
Oltre alla vulnerabilit\u00e0 menzionata, sono stati corretti 4 problemi meno gravi in ksmbd: <\/p>\n
Il supporto per il funzionamento del 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 le funzionalit\u00e0 avanzate del kernel. Ksmbd \u00e8 presentato come un'estensione ad alte prestazioni e pronta per l'uso su dispositivi embedded, integrabile, se necessario, con strumenti e librerie Samba. Gli autori del codice ksmbd sono Namjae Jeon della Samsung e Hyunchul Lee della LG, mentre il supporto integrato nel kernel \u00e8 curato da Steve French di Microsoft, mantenitore del sottosistema CIFS\/SMB2\/SMB3 nel kernel Linux e un veterano del team di sviluppo Samba, che ha fornito 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":"