{"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\/pt\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","title":{"rendered":"Vulnerabilidades explor\u00e1veis foram identificadas no n\u00facleo do Linux nas \u00e1reas de nf_tables, watch_queue e IPsec.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Vulnerabilidades perigosas foram identificadas no n\u00facleo do Linux, permitindo que um usu\u00e1rio local eleve suas permiss\u00f5es no sistema. Prot\u00f3tipos funcionais de exploits foram preparados para todos os problemas em quest\u00e3o.    <\/p>\n<ul>\n<li class=\"l\"> A vulnerabilidade (CVE-2022-0995) no subsistema de rastreamento de eventos watch_queue resulta na grava\u00e7\u00e3o de dados na \u00e1rea de mem\u00f3ria do n\u00facleo al\u00e9m do buffer alocado. Um ataque pode ser realizado por qualquer usu\u00e1rio n\u00e3o privilegiado, levando \u00e0 execu\u00e7\u00e3o de seu c\u00f3digo com privil\u00e9gios de n\u00facleo. A vulnerabilidade est\u00e1 presente na fun\u00e7\u00e3o watch_queue_set_size() e est\u00e1 relacionada \u00e0 tentativa de limpeza de todos os ponteiros na lista, mesmo que a mem\u00f3ria n\u00e3o tenha sido alocada para eles. O problema aparece ao compilar o n\u00facleo com a op\u00e7\u00e3o &#171;CONFIG_WATCH_QUEUE=y&#187;, que \u00e9 utilizada na maioria das distribui\u00e7\u00f5es Linux.\n<p>A vulnerabilidade foi corrigida em uma altera\u00e7\u00e3o adicionada ao n\u00facleo em 11 de mar\u00e7o. \u00c9 poss\u00edvel acompanhar a publica\u00e7\u00e3o de atualiza\u00e7\u00f5es de pacotes nas distribui\u00e7\u00f5es nas seguintes p\u00e1ginas: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Um prot\u00f3tipo de exploit j\u00e1 est\u00e1 dispon\u00edvel publicamente e permite acesso root ao ser executado no Ubuntu 21.10 com o n\u00facleo 5.13.0-37.      <center><img decoding=\"async\" alt=\"Vulnerabilidades explor\u00e1veis foram identificadas no n\u00facleo do Linux nas \u00e1reas de 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\"> A vulnerabilidade (CVE-2022-27666) nos m\u00f3dulos do n\u00facleo esp4 e esp6, que implementam transforma\u00e7\u00f5es ESP (Encapsulating Security Payload) para IPsec, utilizadas em IPv4 e IPv6. A vulnerabilidade permite que um usu\u00e1rio local com privil\u00e9gios normais sobrescreva objetos na mem\u00f3ria do n\u00facleo e eleve suas permiss\u00f5es no sistema. O problema \u00e9 causado pela falta de verifica\u00e7\u00e3o do tamanho de mem\u00f3ria alocada e dos dados efetivamente recebidos, j\u00e1 que o tamanho m\u00e1ximo da mensagem pode exceder o tamanho m\u00e1ximo de mem\u00f3ria alocado para a estrutura skb_page_frag_refill.\n<p>A vulnerabilidade foi corrigida no n\u00facleo em 7 de mar\u00e7o (corrigida em 5.17, 5.16.15, etc.). \u00c9 poss\u00edvel acompanhar a publica\u00e7\u00e3o de atualiza\u00e7\u00f5es de pacotes nas distribui\u00e7\u00f5es nas seguintes p\u00e1ginas: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Um prot\u00f3tipo funcional de exploit, que permite que um usu\u00e1rio comum obtenha acesso root no Ubuntu Desktop 21.10 na configura\u00e7\u00e3o padr\u00e3o, j\u00e1 foi publicado no GitHub. Afirma-se que, com pequenas modifica\u00e7\u00f5es, o exploit tamb\u00e9m funcionar\u00e1 no Fedora e no Debian. \u00c9 not\u00e1vel que o exploit foi originalmente preparado para o concurso pwn2own 2022, mas os desenvolvedores do n\u00facleo identificaram e corrigiram o erro relacionado, portanto, decidiu-se divulgar os detalhes da vulnerabilidade.      <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\"> Duas vulnerabilidades (CVE-2022-1015, CVE-2022-1016) no subsistema netfilter no m\u00f3dulo nf_tables, que fornece a filtragem de pacotes nftables. O primeiro problema permite que um usu\u00e1rio local n\u00e3o privilegiado consiga escrever al\u00e9m do buffer alocado na pilha. O estouro ocorre ao processar express\u00f5es nftables formatadas de forma espec\u00edfica, que s\u00e3o tratadas na etapa de verifica\u00e7\u00e3o dos \u00edndices definidos pelo usu\u00e1rio, que tem acesso \u00e0s regras nftables.\n<p>A vulnerabilidade \u00e9 causada pelo fato de que os desenvolvedores supunham que o valor &#171;enum nft_registers reg&#187; seria um byte, enquanto ao habilitar certas otimiza\u00e7\u00f5es, o compilador, de acordo com a especifica\u00e7\u00e3o C89, pode usar um valor de 32 bits. Devido a essa particularidade, o tamanho usado na verifica\u00e7\u00e3o e aloca\u00e7\u00e3o de mem\u00f3ria n\u00e3o corresponde ao tamanho real dos dados na estrutura, resultando na sobreposi\u00e7\u00e3o do final da estrutura com os ponteiros na pilha.    <\/p>\n<p>O problema pode ser explorado para executar seu c\u00f3digo no n\u00edvel do n\u00facleo, mas para um ataque bem-sucedido, \u00e9 necess\u00e1rio ter acesso ao nftables, o qual pode ser obtido em um espa\u00e7o de nomes de rede separado (network namespaces) com permiss\u00f5es CLONE_NEWUSER ou CLONE_NEWNET (por exemplo, ao ter a capacidade de iniciar um cont\u00eainer isolado). A vulnerabilidade tamb\u00e9m est\u00e1 intimamente relacionada \u00e0s otimiza\u00e7\u00f5es aplicadas pelo compilador, que s\u00e3o, por exemplo, habilitadas ao compilar no modo &#171;CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y&#187;. A explora\u00e7\u00e3o da vulnerabilidade \u00e9 poss\u00edvel a partir do n\u00facleo Linux 5.12.    <\/p>\n<p>A segunda vulnerabilidade no netfilter \u00e9 causada por um acesso a uma \u00e1rea de mem\u00f3ria j\u00e1 liberada (use-after-free) no manipulador nft_do_chain e pode levar a vazamentos de \u00e1reas de mem\u00f3ria do kernel n\u00e3o inicializadas, que podem ser lidas atrav\u00e9s de manipula\u00e7\u00f5es com express\u00f5es nftables e utilizadas, por exemplo, para determinar endere\u00e7os de ponteiros ao desenvolver exploits para outras vulnerabilidades. A explora\u00e7\u00e3o da vulnerabilidade \u00e9 poss\u00edvel a partir do kernel Linux 5.13.    <\/p>\n<p>As vulnerabilidades foram corrigidas nas atualiza\u00e7\u00f5es de hoje do kernel 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. Voc\u00ea pode acompanhar a publica\u00e7\u00e3o das atualiza\u00e7\u00f5es de pacotes nas distribui\u00e7\u00f5es nas seguintes p\u00e1ginas: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. O pesquisador que encontrou os problemas afirmou que est\u00e1 preparando exploits funcionais para ambas as vulnerabilidades, que devem ser publicados em alguns dias, ap\u00f3s as distribui\u00e7\u00f5es lan\u00e7arem as atualiza\u00e7\u00f5es dos pacotes do 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 5.0.3 - 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Prot\u00f3tipos funcionais de exploits foram preparados para todos os problemas em quest\u00e3o.","canonical_url":"https:\/\/prohoster.info\/pt\/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":"pt_PT","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, 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