{"id":103151,"date":"2022-01-31T21:36:52","date_gmt":"2022-01-31T19:36:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonnaya-root-uyazvimost-v-samba"},"modified":"2022-01-31T21:36:52","modified_gmt":"2022-01-31T19:36:52","slug":"udalyonnaya-root-uyazvimost-v-samba","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/udalyonnaya-root-uyazvimost-v-samba","title":{"rendered":"Vulnerabilidade root remota no Samba","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Foram lan\u00e7adas corre\u00e7\u00f5es para as vers\u00f5es 4.15.5, 4.14.12 e 4.13.17, corrigindo 3 vulnerabilidades. A vulnerabilidade mais grave (CVE-2021-44142) permite que um atacante remoto execute c\u00f3digo arbitr\u00e1rio com privil\u00e9gios de root em um sistema com uma vers\u00e3o vulner\u00e1vel do Samba. Essa quest\u00e3o foi classificada com n\u00edvel de severidade 9.9 de 10.    <\/p>\n<p>A vulnerabilidade se manifesta apenas quando se utiliza o m\u00f3dulo VFS vfs_fruit com os par\u00e2metros padr\u00e3o (fruit:metadata=netatalk ou fruit:resource=file), proporcionado um n\u00edvel adicional de compatibilidade com os clientes do mac OS e melhorando a portabilidade com arquivos. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-dusseldorf\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3448\">servidores<\/a> Netatalk 3 AFP. O problema \u00e9 causado por um estouro de buffer no c\u00f3digo de an\u00e1lise de metadados com atributos estendidos (EA, xattr), chamado ao abrir arquivos no smbd. Para realizar o ataque, o usu\u00e1rio deve ter acesso de grava\u00e7\u00e3o aos atributos estendidos do arquivo, sendo que o ataque pode ser realizado por um usu\u00e1rio convidado se a grava\u00e7\u00e3o for permitida.          <\/p>\n<p>\u00c9 poss\u00edvel acompanhar as atualiza\u00e7\u00f5es de pacotes nas distribui\u00e7\u00f5es atrav\u00e9s das p\u00e1ginas: Debian, Ubuntu, RHEL, SUSE, Fedora, Arch, FreeBSD. Como uma solu\u00e7\u00e3o alternativa de prote\u00e7\u00e3o, voc\u00ea pode remover o m\u00f3dulo \"fruit\" da lista \"vfs objects\" no smb.conf.      <\/p>\n<p>As outras duas vulnerabilidades:  <\/p>\n<ul>\n<li class=\"l\"> A vulnerabilidade CVE-2022-0336 permite que um usu\u00e1rio do Samba AD DC se fa\u00e7a passar por outro servi\u00e7o e capture o tr\u00e1fego destinado a esse servi\u00e7o. Para o ataque, o usu\u00e1rio deve ter permiss\u00e3o para modificar o atributo servicePrincipalName na conta.\n<li class=\"l\"> A vulnerabilidade CVE-2021-44141 pode resultar na divulga\u00e7\u00e3o da exist\u00eancia de arquivos e diret\u00f3rios na \u00e1rea do sistema de arquivos al\u00e9m da se\u00e7\u00e3o exportada do Samba. O ataque \u00e9 realizado atrav\u00e9s da manipula\u00e7\u00e3o de links simb\u00f3licos.  <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56615\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 4.15.5, 4.14.12 \u0438 4.13.17 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 3 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-44142) \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0435\u0439 Samba. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 9.9 \u0438\u0437 10. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 VFS-\u043c\u043e\u0434\u0443\u043b\u044f vfs_fruit \u0441 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430\u043c\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e (fruit:metadata=netatalk \u0438\u043b\u0438 fruit:resource=file), \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103151","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" 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