{"id":76196,"date":"2020-03-31T19:42:05","date_gmt":"2020-03-31T17:42:05","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii-cherez-bpf"},"modified":"2020-03-31T19:42:05","modified_gmt":"2020-03-31T17:42:05","slug":"uyazvimost-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii-cherez-bpf","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii-cherez-bpf","title":{"rendered":"Una vulnerabilit\u00e0 nel kernel di Linux che consente di elevare i propri privilegi tramite BPF","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pubblicati<\/a><\/noindex> informazioni sulla vulnerabilit\u00e0 (CVE-2020-8835<\/a><\/noindex>) nel kernel di Linux, che \u00e8 stata utilizzata in una competizione Pwn2Own 2020<\/a><\/noindex> per dimostrare l'hacking di Ubuntu. La vulnerabilit\u00e0 ha permesso a un utente non privilegiato di ottenere i diritti di root. Esiste un exploit funzionante, ma non \u00e8 stato ancora pubblicato. La vulnerabilit\u00e0 \u00e8 presente nel sottosistema eBPF, che consente di eseguire gestori per il tracciamento, l'analisi delle prestazioni dei sottosistemi e la gestione del traffico, eseguiti all'interno del kernel in una speciale macchina virtuale con JIT.<\/p>\n

Il problema \u00e8 causato da un errore nella funzione __reg_bound_offset32(), utilizzata per verificare le operazioni a 32 bit nel bytecode BPF. A causa di un calcolo errato dei confini del registro, nel trattamento di applicazioni BPF appositamente create, si sono verificate condizioni per la lettura e la scrittura di dati al di fuori del buffer allocato nella memoria del kernel. Il problema \u00e8 emerso nel kernel 5.5 e successivamente, durante il backporting delle correzioni, \u00e8 stato trasferito nel kernel 5.4, nonch\u00e9 in un pacchetto con il kernel 5.3<\/a><\/noindex>, offerto in Ubuntu Linux.<\/p>\n

Per bloccare la vulnerabilit\u00e0 si raccomanda di annullare<\/a><\/noindex> la patch problematica o vietare l'esecuzione di applicazioni BPF da parte di utenti non privilegiati impostando sysctl kernel.unprivileged_bpf_disabled su 1. Stato della correzione nelle distribuzioni: Ubuntu<\/a><\/noindex>, Debian<\/a><\/noindex>, Arch<\/a><\/noindex>, Fedora<\/a><\/noindex> e SUSE<\/a><\/noindex> (nel kernel RHEL<\/a><\/noindex> la modifica problematica non \u00e8 stata trasferita).<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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