{"id":114603,"date":"2024-03-27T12:25:57","date_gmt":"2024-03-27T10:25:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-yadre-linux-pozvolyayushhie-podnyat-svoi-privilegii-cherez-nf_tables-i-ksmbd"},"modified":"2024-03-27T12:25:57","modified_gmt":"2024-03-27T10:25:58","slug":"uyazvimosti-v-yadre-linux-pozvolyayushhie-podnyat-svoi-privilegii-cherez-nf_tables-i-ksmbd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-v-yadre-linux-pozvolyayushhie-podnyat-svoi-privilegii-cherez-nf_tables-i-ksmbd","title":{"rendered":"Vulnerabilit\u00e0 nel kernel Linux che consentono di elevare i propri privilegi tramite nf_tables e ksmbd","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In Netfilter, the Linux kernel subsystem used for filtering and modifying network packets, a vulnerability (CVE-2024-1086) has been identified that allows a local user to execute code at the kernel level and elevate their privileges within the system. The issue is caused by a double free in the nf_tables module, which supports the nftables packet filtering. The security researcher who discovered the vulnerability has developed and published a working exploit prototype. <\/p>\n

The exploit's functionality has been demonstrated in current releases of Debian and Ubuntu with Linux kernels 5.14 \u2014 6.6, as well as in an environment with KernelCTF (Capture the Flag), which includes additional patches to block common exploit methods and is used by Google in their bug bounty program. The exploit's success rate is estimated at 99.4%. The accompanying article details the process of creating a complex multi-layered exploit and bypassing the protective mechanisms and countermeasures present in the kernel.

\"Vulnerabilit\u00e0<\/center> <\/p>\n

Il problema \u00e8 legato a un errore nella funzione nft_verdict_init(), che consente l'uso di valori positivi come codice di errore per il rilascio dei pacchetti (DROP) negli hook, il che pu\u00f2 essere sfruttato per chiamare nella funzione nf_hook_slow() nuovamente l'operazione di rilascio della memoria per un buffer per il quale \u00e8 gi\u00e0 stata chiamata la funzione free(). Il problema si verifica quando l'operazione NF_DROP \u00e8 formata con un errore, ed il kernel inizialmente interpreta NF_DROP, ma poi rilascia il buffer e restituisce lo stato NF_ACCEPT. Questa situazione porta al fatto che, nonostante il rilascio del buffer associato al pacchetto, il suo trattamento non si interrompe, ma viene passato a un altro gestore, che a sua volta chiama di nuovo la funzione di rilascio della memoria. <\/p>\n

La vulnerabilit\u00e0 si manifesta a partire dalla versione del kernel Linux 3.15, ma l'exploit funziona con i kernel a partire dalla versione 5.14. La correzione della vulnerabilit\u00e0 \u00e8 stata proposta nella versione del kernel Linux 6.8-rc1 e a fine febbraio \u00e8 stata trasferita nei rami stabili 5.15.149, 6.1.76 e 6.6.15. Nei vari distribuzioni, \u00e8 possibile seguire la correzione della vulnerabilit\u00e0 alle seguenti pagine: Debian, Ubuntu, Gentoo, RHEL, SUSE, Fedora, Arch. <\/p>\n

\u00c8 possibile anche notare una serie di vulnerabilit\u00e0 nel modulo ksmbd, che offre un'implementazione di file system integrata nel kernel di Linux \u0441\u0435\u0440\u0432\u0435\u0440\u0430<\/a> basata sul protocollo SMB: La vulnerabilit\u00e0 CVE-2024-26592 consente l'esecuzione remota di codice con privilegi di kernel su sistemi con il modulo ksmbd attivato, senza autenticazione. Il problema \u00e8 causato da una condizione di competizione nel codice di gestione delle connessioni TCP, che si verifica a causa della mancanza di livelli di blocco adeguati durante l'interazione con l'oggetto. <\/p>\n

La vulnerabilit\u00e0 CVE-2023-52440 consente anch'essa l'esecuzione remota di codice con privilegi di kernel, ma \u00e8 causata da un overflow del buffer durante la gestione di chiavi di sessione non valide, a causa della mancanza di un'adeguata verifica della dimensione dei dati ricevuti dall'utente prima della copia nel buffer di dimensioni fisse. <\/p>\n

Le vulnerabilit\u00e0 (1, 2, 3) CVE-2024-26594, CVE-2023-52442 e CVE-2023-52441 in ksmbd consentono di determinare il contenuto della memoria del kernel da remoto senza autenticazione. La vulnerabilit\u00e0 CVE-2024-26594 \u00e8 causata da un controllo dei dati inadeguato nella gestione dei token SMB2 Mech, che porta al ritorno di dati dall'area oltre il buffer. La vulnerabilit\u00e0 CVE-2023-52442 \u00e8 causata dalla mancanza di un adeguato controllo dei dati in entrata nella gestione di richieste concatenate (chained). La vulnerabilit\u00e0 CVE-2023-52441 \u00e8 causata dalla mancanza di un necessario controllo dei dati in entrata nella gestione delle richieste di negoziazione della connessione SMB2. <\/p>\n

Le vulnerabilit\u00e0 CVE-2024-26594 e CVE-2024-26592 sono state risolte nel kernel 6.8 e negli aggiornamenti correttivi delle versioni stabili precedenti 6.1.75, 6.6.14, 6.7.2. Le altre vulnerabilit\u00e0 sono state risolte nel kernel 6.5 e negli aggiornamenti 5.15.145, 6.1.53, 6.4.16. <\/p>\n

In conclusione, si pu\u00f2 menzionare l'attivazione di una nuova squadra di sviluppatori del kernel Linux, creata per analizzare la presenza di vulnerabilit\u00e0 e valutare la relazione tra le correzioni apportate al kernel e le problematiche di sicurezza. A febbraio, gli sviluppatori del kernel hanno istituito un proprio servizio CNA (CVE Numbering Authority), che ha ricevuto il potere di assegnare autonomamente i CVE-ID alle vulnerabilit\u00e0. Prima di questo, l'assegnazione dei CVE e l'analisi della relazione tra le correzioni e le potenziali vulnerabilit\u00e0 gravava sugli sviluppatori delle distribuzioni, e nel kernel le potenziali vulnerabilit\u00e0 non erano evidenziate e figuravano allo stesso modo delle correzioni ordinarie. I risultati ottenuti dal nuovo servizio hanno superato ogni aspettativa: ogni giorno nel kernel vengono etichettate fino a diverse decine di nuove vulnerabilit\u00e0 che precedentemente non erano state contrassegnate come problemi di sicurezza. Ad esempio, il 26 marzo sono stati assegnati nuovi CVE-ID a 14 vulnerabilit\u00e0 che in precedenza non erano state considerate come problemi di sicurezza, e il 25 marzo a 41 vulnerabilit\u00e0.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 Netfilter, \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u044f\u0434\u0440\u0430 Linux, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0439 \u0434\u043b\u044f \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u0438 \u043c\u043e\u0434\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-1086), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u0438 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0434\u0432\u043e\u0439\u043d\u044b\u043c \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0438\u0435\u043c \u043f\u0430\u043c\u044f\u0442\u0438 (double-free) \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 nf_tables, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u043c \u0440\u0430\u0431\u043e\u0442\u0443 \u043f\u0430\u043a\u0435\u0442\u043d\u043e\u0433\u043e \u0444\u0438\u043b\u044c\u0442\u0440\u0430 nftables. \u0412\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b \u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0440\u0430\u0431\u043e\u0447\u0438\u0439 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430. \u0420\u0430\u0431\u043e\u0442\u0430 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":114604,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-114603","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47Vulnerabilit\u00e0 nel kernel Linux che consentono di elevare i propri privilegi attraverso nf_tables e ksmbd | ProHoster","description":"In Netfilter, the Linux kernel subsystem used for filtering and modifying network packets, a vulnerability (CVE-2024-1086) has been discovered that allows a local user to execute code at the kernel level and escalate their privileges within the system. The issue is caused by a double-free memory error in the nf_tables module, which supports the nftables packet filter. The security researcher who identified the vulnerability developed and published a working exploit prototype. The exploit's operation","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-v-yadre-linux-pozvolyayushhie-podnyat-svoi-privilegii-cherez-nf_tables-i-ksmbd","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\u0438 \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 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