{"id":102262,"date":"2021-11-10T21:36:39","date_gmt":"2021-11-10T19:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-samba-ustraneno-8-opasnyh-uyazvimostej"},"modified":"2021-11-10T21:36:39","modified_gmt":"2021-11-10T19:36:39","slug":"v-samba-ustraneno-8-opasnyh-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/v-samba-ustraneno-8-opasnyh-uyazvimostej","title":{"rendered":"O Samba corrigiu 8 vulnerabilidades cr\u00edticas","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Foram publicados lan\u00e7amentos corretivos para os pacotes Samba 4.15.2, 4.14.10 e 4.13.14, corrigindo 8 vulnerabilidades, a maioria das quais pode levar \u00e0 completa comprometimento do dom\u00ednio Active Directory. Notavelmente, um dos problemas foi corrigido desde 2016, e cinco desde 2020, no entanto, uma corre\u00e7\u00e3o levou \u00e0 incapacidade de iniciar o winbindd quando configurado como 'allow trusted domains = no' (os desenvolvedores pretendem publicar rapidamente mais uma atualiza\u00e7\u00e3o com a corre\u00e7\u00e3o). O lan\u00e7amento das atualiza\u00e7\u00f5es dos pacotes nas distribui\u00e7\u00f5es pode ser acompanhado nas p\u00e1ginas: Debian, Ubuntu, RHEL, SUSE, Fedora, Arch, FreeBSD.    <\/p>\n<p>Vulnerabilidades corrigidas:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-25717 \u2014 devido a uma falha na l\u00f3gica de mapeamento de usu\u00e1rios de dom\u00ednio com usu\u00e1rios do sistema local, um usu\u00e1rio do dom\u00ednio Active Directory que pode criar novas contas em seu sistema, gerenciado atrav\u00e9s do ms-DS-MachineAccountQuota, poderia obter acesso com privil\u00e9gios de root em outros sistemas que fazem parte de <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/domain\/\"   title=\"o dom\u00ednio\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4094\">o dom\u00ednio<\/a>.\n<li class=\"l\"> CVE-2021-3738 \u2014 acesso a uma \u00e1rea de mem\u00f3ria j\u00e1 liberada (Use after free) na implementa\u00e7\u00e3o do servidor RPC Samba AD DC (dsdb), o que pode potencialmente levar a uma eleva\u00e7\u00e3o de privil\u00e9gios ao manipular a configura\u00e7\u00e3o das conex\u00f5es.\n<li class=\"l\"> CVE-2016-2124 \u2014 conex\u00f5es de clientes estabelecidas usando o protocolo SMB1 poderiam ser comprometidas, permitindo a transmiss\u00e3o de credenciais de autentica\u00e7\u00e3o em texto claro ou via NTLM (por exemplo, para descobrir as credenciais em ataques MITM), mesmo que o usu\u00e1rio ou aplicativo estivesse configurado para exigir autentica\u00e7\u00e3o via Kerberos.\n<li class=\"l\"> CVE-2020-25722 \u2014 no controlador de dom\u00ednio Active Directory baseado em Samba, n\u00e3o eram feitas as devidas verifica\u00e7\u00f5es de acesso aos dados armazenados, o que permitia que qualquer usu\u00e1rio contornasse as verifica\u00e7\u00f5es de autoridade e comprometesse completamente o dom\u00ednio.\n<li class=\"l\"> CVE-2020-25718 \u2014 no controlador de dom\u00ednio Active Directory baseado em Samba, os bilhetes Kerberos emitidos por um RODC (Controlador de Dom\u00ednio Somente Leitura) n\u00e3o eram devidamente isolados, o que poderia ser usado para obter bilhetes de administrador do RODC sem ter as permiss\u00f5es necess\u00e1rias.\n<li class=\"l\"> CVE-2020-25719 \u2014 o controlador de dom\u00ednio Active Directory baseado em Samba nem sempre considerava os campos SID e PAC nas tickets Kerberos (ao configurar \u2018gensec:require_pac = true\u2019, apenas o nome era verificado, e o PAC n\u00e3o era levado em conta), permitindo que um usu\u00e1rio com permiss\u00e3o para criar contas no sistema local se passasse por outro usu\u00e1rio no dom\u00ednio, incluindo um usu\u00e1rio privilegiado.\n<li class=\"l\"> CVE-2020-25721 \u2014 para usu\u00e1rios autenticados com Kerberos, identificadores nem sempre \u00fanicos eram gerados para o Active Directory (objectSid), o que poderia levar a sobreposi\u00e7\u00f5es entre usu\u00e1rios.\n<li class=\"l\"> CVE-2021-23192 \u2014 durante um ataque MITM, havia a possibilidade de substituir fragmentos em grandes solicita\u00e7\u00f5es DCE\/RPC, divididas em v\u00e1rias partes.  <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56132\">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 Samba 4.15.2, 4.14.10 \u0438 4.13.14 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 8 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u043b\u043d\u043e\u0439 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u0438 \u0434\u043e\u043c\u0435\u043d\u0430 Active Directory. \u041f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u0447\u0442\u043e \u043e\u0434\u043d\u0443 \u0438\u0437 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u044f\u043b\u0438 \u0441 2016 \u0433\u043e\u0434\u0430, \u0430 \u043f\u044f\u0442\u044c &#8212; \u0441 2020 \u0433\u043e\u0434\u0430, \u0442\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435 \u043e\u0434\u043d\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0435\u043b\u043e \u043a \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c winbindd \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438 &#171;allow trusted domains [&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-102262","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\" content=\"\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 Samba 4.15.2, 4.14.10 \u0438 4.13.14 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 8 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, 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