{"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\/ro\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","title":{"rendered":"Vulnerabilit\u0103\u021bi exploatabile \u00een nf_tables, watch_queue \u0219i IPsec au fost identificate \u00een nucleul Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00cen nucleul Linux au fost identificate mai multe vulnerabilit\u0103\u021bi periculoase care permit unui utilizator local s\u0103 \u00ee\u0219i creasc\u0103 privilegiile \u00een sistem. Prototipuri func\u021bionale de exploit-uri au fost preg\u0103tite pentru toate problemele discutate.    <\/p>\n<ul>\n<li class=\"l\"> Vulnerabilitatea (CVE-2022-0995) \u00een subsystemul de urm\u0103rire a evenimentelor watch_queue, care conduce la scrierea de date \u00een zona de memorie a nucleului dincolo de bufferul alocat. Atacul poate fi realizat de orice utilizator neprivilegiat \u0219i poate duce la executarea propriei sale coduri cu drepturi de nucleu. Vulnerabilitatea este prezent\u0103 \u00een func\u021bia watch_queue_set_size() \u0219i este legat\u0103 de \u00eencercarea de a cur\u0103\u021ba toate pointerele din list\u0103, chiar dac\u0103 pentru acestea nu a fost alocat\u0103 memorie. Problema se manifest\u0103 la compilarea nucleului cu op\u021biunea \"CONFIG_WATCH_QUEUE=y\", care este utilizat\u0103 \u00een majoritatea distribu\u021biilor Linux.\n<p>Vulnerabilitatea a fost remediat\u0103 \u00een modificarea ad\u0103ugat\u0103 \u00een nucleu pe 11 martie. Pute\u021bi urm\u0103ri publica\u021biile actualiz\u0103rilor de pachete \u00een distribu\u021bii pe aceste pagini: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Prototipul exploit-ului este deja disponibil public \u0219i permite ob\u021binerea accesului root la rularea \u00een Ubuntu 21.10 cu nucleul 5.13.0-37.      <center><img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi exploatabile \u00een nf_tables, watch_queue \u0219i IPsec au fost identificate \u00een nucleul Linux\" src=\"\/wp-content\/uploads\/2022\/03\/9cdfd5bdf66d257757d1a4c600b96249.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<li class=\"l\"> Vulnerabilitatea (CVE-2022-27666) \u00een modulele nucleului esp4 \u0219i esp6 care implementeaz\u0103 transform\u0103rile ESP (Encapsulating Security Payload) pentru IPsec, utilizate \u00een cazul IPv4 \u0219i IPv6. Vulnerabilitatea permite unui utilizator local cu privilegii obi\u0219nuite s\u0103 suprascrie obiecte \u00een memoria nucleului \u0219i s\u0103 \u00ee\u0219i creasc\u0103 privilegiile \u00een sistem. Problema este cauzat\u0103 de lipsa verific\u0103rii dimensiunii memoriei alocate \u0219i a datelor efectiv primite, av\u00e2nd \u00een vedere c\u0103 dimensiunea maxim\u0103 a mesajului putea dep\u0103\u0219i dimensiunea maxim\u0103 a memoriei alocate pentru structura skb_page_frag_refill.\n<p>Vulnerabilitatea a fost remediat\u0103 \u00een nucleul din 7 martie (corectat\u0103 \u00een 5.17, 5.16.15 etc.). Pute\u021bi urm\u0103ri publica\u021biile actualiz\u0103rilor de pachete \u00een distribu\u021bii pe aceste pagini: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Prototipul func\u021bional al exploit-ului, care permite unui utilizator obi\u0219nuit s\u0103 ob\u021bin\u0103 acces root \u00een Ubuntu Desktop 21.10 \u00een configura\u021bia implicit\u0103, a fost deja postat pe GitHub. Se afirm\u0103 c\u0103, cu modific\u0103ri minore, exploit-ul va fi func\u021bional \u0219i \u00een Fedora \u0219i Debian. Este remarcabil c\u0103 exploit-ul a fost ini\u021bial preg\u0103tit pentru competi\u021bia pwn2own 2022, dar dezvoltatorii nucleului au identificat \u0219i corectat eroarea asociat\u0103, motiv pentru care s-a decis s\u0103 se dezv\u0103luie detalii despre vulnerabilitate.      <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\"> Dou\u0103 vulnerabilit\u0103\u021bi (CVE-2022-1015, CVE-2022-1016) \u00een subsistemul netfilter \u00een modulul nf_tables, care asigur\u0103 func\u021bionarea filtrului de pachete nftables. Prima problem\u0103 permite unui utilizator local f\u0103r\u0103 privilegii s\u0103 scrie dincolo de bufferul alocat \u00een stiv\u0103. Supra\u00eenc\u0103rcarea apare atunci c\u00e2nd se proceseaz\u0103 expresii nftables formatate \u00eentr-un anumit mod, care sunt verificate \u00een etapa de control a indec\u0219ilor defini\u021bi de utilizator, av\u00e2nd acces la regulile nftables.\n<p>Vulnerabilitatea este cauzat\u0103 de faptul c\u0103 dezvoltatorii au presupus c\u0103 valoarea \"enum nft_registers reg\" este un byte, \u00een timp ce, c\u00e2nd sunt activate anumite optimiz\u0103ri, compilatorul conform specifica\u021biei C89 poate folosi o valoare de 32 de bi\u021bi. Din cauza acestei caracteristici, dimensiunea utilizat\u0103 pentru verificare \u0219i alocare de memorie nu corespunde dimensiunii reale a datelor din structur\u0103, ceea ce conduce la suprapunerea cap\u0103tului structurii pe pointerele din stiv\u0103.    <\/p>\n<p>Problema poate fi exploatat\u0103 pentru a executa propriul cod la nivelul nucleului, dar pentru un atac de succes este necesar s\u0103 existe acces la nftables, care poate fi ob\u021binut \u00eentr-un spa\u021biu de re\u021bea (network namespaces) separat, \u00een prezen\u021ba drepturilor CLONE_NEWUSER sau CLONE_NEWNET (de exemplu, \u00een cazul posibilit\u0103\u021bii de a rula un container izolat). Vulnerabilitatea este, de asemenea, str\u00e2ns legat\u0103 de optimiz\u0103rile aplicate de compilator, care sunt activate, de exemplu, \u00een modul \"CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y\". Exploatarea vulnerabilit\u0103\u021bii este posibil\u0103 \u00eencep\u00e2nd cu nucleul Linux 5.12.    <\/p>\n<p>A doua vulnerabilitate \u00een netfilter este cauzat\u0103 de accesarea unei zone de memorie deja eliberate (use-after-free) \u00een handlerul nft_do_chain \u0219i poate duce la scurgeri de zone de memorie neini\u021bializate ale nucleului, care pot fi citite prin manipularea expresiilor nftables \u0219i utilizate, de exemplu, pentru a determina adresele pointerilor \u00een dezvoltarea exploit-urilor pentru alte vulnerabilit\u0103\u021bi. Exploatarea vulnerabilit\u0103\u021bii este posibil\u0103 \u00eencep\u00e2nd cu nucleul Linux 5.13.    <\/p>\n<p>Vulnerabilit\u0103\u021bile au fost remediate \u00een actualiz\u0103rile corective de ast\u0103zi ale nucleului 5.17.1, 5.16.18, 5.15.32, 5.10.109, 5.4.188, 4.19.237, 4.14.274 \u0219i 4.9.309. Pute\u021bi urm\u0103ri publica\u021biile actualiz\u0103rilor pachetelor \u00een distribu\u021bii pe aceste pagini: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Cercet\u0103torul care a identificat problemele a declarat c\u0103 a preg\u0103tit exploituri func\u021bionale pentru ambele vulnerabilit\u0103\u021bi, care vor fi publicate \u00een c\u00e2teva zile, dup\u0103 ce distribu\u021biile vor lansa actualiz\u0103rile pachetelor cu nucleul.      <\/ul>\n<p>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56931\">opennet.ro<\/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 5.0.2.1 - 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Prototipuri func\u021bionale de exploit-uri au fost preg\u0103tite pentru toate problemele discutate.","canonical_url":"https:\/\/prohoster.info\/ro\/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":"ro_RO","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 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