{"id":100059,"date":"2021-04-29T10:22:42","date_gmt":"2021-04-29T08:22:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-dns-servera-bind-c-ustraneniem-uyazvimosti-dopuskayushhej-udalyonnoe-vypolnenie-koda"},"modified":"2021-04-29T10:22:42","modified_gmt":"2021-04-29T08:22:42","slug":"obnovlenie-dns-servera-bind-c-ustraneniem-uyazvimosti-dopuskayushhej-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/obnovlenie-dns-servera-bind-c-ustraneniem-uyazvimosti-dopuskayushhej-udalyonnoe-vypolnenie-koda","title":{"rendered":"Atualiza\u00e7\u00e3o do servidor DNS BIND com corre\u00e7\u00e3o para vulnerabilidade que permite execu\u00e7\u00e3o remota de c\u00f3digo","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Foram publicadas atualiza\u00e7\u00f5es corretivas para as vers\u00f5es est\u00e1veis do servidor DNS BIND 9.11.31 e 9.16.15, assim como para a vers\u00e3o experimental em desenvolvimento 9.17.12. As novas vers\u00f5es corrigem tr\u00eas vulnerabilidades, uma das quais (CVE-2021-25216) pode levar a um estouro de buffer. Em sistemas de 32 bits, a vulnerabilidade pode ser explorada para execu\u00e7\u00e3o de c\u00f3digo remoto por um invasor atrav\u00e9s do envio de uma solicita\u00e7\u00e3o GSS-TSIG especialmente formatada. Em sistemas de 64 bits, o problema se limita a falhas do processo named.      <\/p>\n<p>O problema ocorre apenas quando o mecanismo GSS-TSIG \u00e9 ativado atrav\u00e9s das configura\u00e7\u00f5es tkey-gssapi-keytab e tkey-gssapi-credential. O GSS-TSIG est\u00e1 desativado na configura\u00e7\u00e3o padr\u00e3o e \u00e9 geralmente utilizado em ambientes mistos, onde o BIND \u00e9 combinado com controladores de dom\u00ednio do Active Directory, ou durante a integra\u00e7\u00e3o com o Samba.       <\/p>\n<p>A vulnerabilidade \u00e9 causada por um erro na implementa\u00e7\u00e3o do mecanismo SPNEGO (Mecanismo de Negocia\u00e7\u00e3o Simples e Protegido GSSAPI), utilizado no GSSAPI para negociar os m\u00e9todos de prote\u00e7\u00e3o entre o cliente e o servidor. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-prohoster\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3007\">servidor<\/a> O GSSAPI \u00e9 utilizado como um protocolo de alto n\u00edvel para troca segura de chaves atrav\u00e9s da extens\u00e3o GSS-TSIG, empregada durante a autentica\u00e7\u00e3o de atualiza\u00e7\u00f5es din\u00e2micas de zonas DNS.         <\/p>\n<p>Uma vez que vulnerabilidades cr\u00edticas na implementa\u00e7\u00e3o interna do SPNEGO foram identificadas anteriormente, a implementa\u00e7\u00e3o deste protocolo foi removida da base de c\u00f3digo do BIND 9. Para usu\u00e1rios que necessitam de suporte ao SPNEGO, \u00e9 recomendado utilizar uma implementa\u00e7\u00e3o externa fornecida pela biblioteca de sistema GSSAPI (dispon\u00edvel no MIT Kerberos e Heimdal Kerberos).     <\/p>\n<p>Os usu\u00e1rios de vers\u00f5es antigas do BIND podem, como uma solu\u00e7\u00e3o alternativa para a quest\u00e3o de bloqueio, desativar o GSS-TSIG nas configura\u00e7\u00f5es (par\u00e2metros tkey-gssapi-keytab e tkey-gssapi-credential) ou recompilar o BIND sem suporte ao mecanismo SPNEGO (op\u00e7\u00e3o &#171;&#8212;disable-isc-spnego&#187; no script &#171;configure&#187;). Atualiza\u00e7\u00f5es nos pacotes podem ser acompanhadas nas p\u00e1ginas: Debian, SUSE, Ubuntu, Fedora, Arch Linux, FreeBSD, NetBSD. Os pacotes RHEL e ALT Linux s\u00e3o compilados sem suporte integrado ao SPNEGO.              <\/p>\n<p>Al\u00e9m disso, nas atualiza\u00e7\u00f5es em quest\u00e3o, o BIND corrige mais duas vulnerabilidades:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2021-25215 &#8212; falha do processo named ao processar registros DNAME (redirigindo o processamento de parte dos subdom\u00ednios), resultando na adi\u00e7\u00e3o de duplicatas na se\u00e7\u00e3o ANSWER. Para explorar a vulnerabilidade em servidores DNS autoritativos, \u00e9 necess\u00e1rio modificar as zonas DNS processadas, enquanto para recursivos <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1576\">servidores<\/a> o registro problem\u00e1tico pode ser obtido ap\u00f3s a consulta ao servidor autoritativo.\n<li class=\"l\"> CVE-2021-25214 &#8212; falha do processo named ao processar um pedido IXFR de entrada especialmente formatado (usado para transmiss\u00e3o incremental entre servidores DNS de altera\u00e7\u00f5es nas zonas DNS). O problema afeta apenas sistemas que permitiram a transmiss\u00e3o de zonas DNS a partir do servidor atacante (normalmente, a transmiss\u00e3o de zonas \u00e9 usada para sincronizar servidores master e slave e geralmente \u00e9 concedida apenas a servidores confi\u00e1veis). Como uma solu\u00e7\u00e3o alternativa de prote\u00e7\u00e3o, pode-se desativar o suporte ao IXFR usando a configura\u00e7\u00e3o &#171;request-ixfr no;&#187;.    <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55042\">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 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0442\u043e\u043a DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 BIND 9.11.31 \u0438 9.16.15, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0435\u0439\u0441\u044f \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 9.17.12. \u0412 \u043d\u043e\u0432\u044b\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0442\u0440\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043e\u0434\u043d\u0430 \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 (CVE-2021-25216) \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0431\u0443\u0444\u0435\u0440\u0430. \u041d\u0430 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430 GSS-TSIG. \u041d\u0430 64-\u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u0440\u0430\u0445\u043e\u043c [&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-100059","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 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0442\u043e\u043a DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 BIND 9.11.31 \u0438 9.16.15, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0435\u0439\u0441\u044f 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