{"id":103645,"date":"2022-03-29T15:37:18","date_gmt":"2022-03-29T13:37:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec"},"modified":"2022-03-29T15:37:18","modified_gmt":"2022-03-29T13:37:19","slug":"v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","title":{"rendered":"Sono state individuate vulnerabilit\u00e0 sfruttabili nel kernel Linux in nf_tables, watch_queue e IPsec","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nel kernel Linux sono state individuate diverse vulnerabilit\u00e0 pericolose che consentono a un utente locale di elevare i propri privilegi nel sistema. Per tutti i problemi esaminati sono stati preparati prototipi funzionanti di exploit.    <\/p>\n<ul>\n<li class=\"l\"> Vulnerabilit\u00e0 (CVE-2022-0995) nel sottosistema di tracciamento eventi watch_queue, che porta alla scrittura di dati nell'area di memoria del kernel oltre il buffer allocato. Un attacco pu\u00f2 essere eseguito da qualsiasi utente non privilegiato e portare all'esecuzione di codice con diritti di kernel. La vulnerabilit\u00e0 \u00e8 presente nella funzione watch_queue_set_size() ed \u00e8 correlata al tentativo di pulire tutti i puntatori nella lista, anche se non \u00e8 stata allocata memoria per essi. Il problema si manifesta quando il kernel \u00e8 compilato con l'opzione \"CONFIG_WATCH_QUEUE=y\", utilizzata nella maggior parte delle distribuzioni Linux.\n<p>La vulnerabilit\u00e0 \u00e8 stata risolta in una modifica aggiunta al kernel l'11 marzo. \u00c8 possibile seguire la pubblicazione degli aggiornamenti dei pacchetti nelle distribuzioni su queste pagine: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Un prototipo di exploit \u00e8 gi\u00e0 disponibile pubblicamente e consente di ottenere l'accesso root avviando Ubuntu 21.10 con il kernel 5.13.0-37.      <center><img decoding=\"async\" alt=\"Sono state individuate vulnerabilit\u00e0 sfruttabili nel kernel Linux in nf_tables, watch_queue e IPsec\" src=\"\/wp-content\/uploads\/2022\/03\/9cdfd5bdf66d257757d1a4c600b96249.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<li class=\"l\"> La vulnerabilit\u00e0 (CVE-2022-27666) nei moduli del kernel esp4 ed esp6 con implementazione delle trasformazioni ESP (Encapsulating Security Payload) per IPsec, utilizzate con IPv4 e IPv6. La vulnerabilit\u00e0 consente a un utente locale con privilegi normali di sovrascrivere oggetti nella memoria del kernel ed elevare i propri privilegi nel sistema. Il problema \u00e8 causato dalla mancanza di controllo tra la dimensione di memoria allocata e i dati effettivamente ricevuti, dato che la dimensione massima del messaggio potrebbe superare la dimensione massima di memoria allocata per la struttura skb_page_frag_refill.\n<p>La vulnerabilit\u00e0 \u00e8 stata risolta nel kernel il 7 marzo (corretta in 5.17, 5.16.15 e cos\u00ec via). \u00c8 possibile seguire la pubblicazione degli aggiornamenti dei pacchetti nelle distribuzioni su queste pagine: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Un prototipo funzionante dell'exploit, che consente a un utente normale di ottenere l'accesso root in Ubuntu Desktop 21.10 nella configurazione predefinita, \u00e8 gi\u00e0 stato pubblicato su GitHub. Si sostiene che con modifiche minori l'exploit funger\u00e0 anche in Fedora e Debian. \u00c8 interessante notare che l'exploit era originariamente stato preparato per la competizione pwn2own 2022, ma gli sviluppatori del kernel hanno scoperto e corretto un errore associato, quindi \u00e8 stato deciso di rivelare i dettagli della vulnerabilit\u00e0.      <center>  <video controls=\"\" style=\"width: 720px; height: 480px; max-width:100%\" src=\"https:\/\/etenal.me\/wp-content\/uploads\/2022\/03\/yes_root.mp4\" ><source src=\"https:\/\/etenal.me\/wp-content\/uploads\/2022\/03\/yes_root.mp4\" type=\"video\/mp4\"><\/video><\/center>    <\/p>\n<li class=\"l\"> Due vulnerabilit\u00e0 (CVE-2022-1015, CVE-2022-1016) nel sottosistema netfilter nel modulo nf_tables, che gestisce il filtraggio dei pacchetti nftables. Il primo problema consente a un utente locale senza privilegi di scrivere oltre il buffer allocato nello stack. Il overflow si verifica durante la gestione di espressioni nftables formattate in un certo modo, elaborate nella fase di verifica degli indici forniti dall'utente che ha accesso alle regole nftables.\n<p>La vulnerabilit\u00e0 \u00e8 causata dal fatto che gli sviluppatori presumevano che il valore \"enum nft_registers reg\" fosse un byte, mentre abilitando specifiche ottimizzazioni il compilatore, secondo la specifica C89, pu\u00f2 utilizzare un valore a 32 bit. A causa di questa particolarit\u00e0, la dimensione utilizzata per il controllo e l'allocazione della memoria non corrisponde alla dimensione reale dei dati nella struttura, il che porta a una sovrapposizione della coda della struttura sui puntatori nello stack.    <\/p>\n<p>Il problema pu\u00f2 essere sfruttato per eseguire codice a livello di kernel, ma per un attacco di successo \u00e8 necessario avere accesso a nftables, che pu\u00f2 essere ottenuto in uno spazio di nomi di rete separato (network namespaces) con i diritti CLONE_NEWUSER o CLONE_NEWNET (ad esempio, quando si ha la possibilit\u00e0 di avviare un contenitore isolato). La vulnerabilit\u00e0 \u00e8 anche strettamente legata alle ottimizzazioni applicate dal compilatore, che ad esempio vengono abilitate durante la compilazione in modalit\u00e0 \"CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y\". Lo sfruttamento della vulnerabilit\u00e0 \u00e8 possibile a partire dal kernel Linux 5.12.    <\/p>\n<p>La seconda vulnerabilit\u00e0 in netfilter \u00e8 causata dall'accesso a un'area di memoria gi\u00e0 liberata (use-after-free) nel gestore nft_do_chain e pu\u00f2 portare a perdite di aree di memoria non inizializzate nel kernel, leggibili tramite manipolazioni delle espressioni nftables e utilizzabili, ad esempio, per determinare gli indirizzi dei puntatori nello sviluppo di exploit per altre vulnerabilit\u00e0. L'exploitation della vulnerabilit\u00e0 \u00e8 possibile a partire dal kernel Linux 5.13.    <\/p>\n<p>Le vulnerabilit\u00e0 sono state corrette negli aggiornamenti del kernel odierno 5.17.1, 5.16.18, 5.15.32, 5.10.109, 5.4.188, 4.19.237, 4.14.274 e 4.9.309. \u00c8 possibile seguire le pubblicazioni degli aggiornamenti dei pacchetti nelle distribuzioni sulle seguenti pagine: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Il ricercatore che ha identificato i problemi ha annunciato di avere a disposizione exploit funzionanti per entrambe le vulnerabilit\u00e0, che verranno pubblicati tra pochi giorni, dopo che le distribuzioni rilasceranno gli aggiornamenti dei pacchetti con il kernel.      <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56931\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043e\u043f\u0430\u0441\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0414\u043b\u044f \u0432\u0441\u0435\u0445 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u044b \u0440\u0430\u0431\u043e\u0447\u0438\u0435 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-0995) \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0431\u044b\u0442\u0438\u0439 watch_queue, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u043e\u043c \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430. \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u043b\u044e\u0431\u044b\u043c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0438 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0437\u0430\u043f\u0443\u0441\u043a\u0443 \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103646,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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Per tutti i problemi esaminati sono stati preparati prototipi funzionanti di exploit.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","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\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u044b\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 nf_tables, watch_queue 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