{"id":102953,"date":"2022-01-13T15:37:33","date_gmt":"2022-01-13T13:37:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d0%b8-%d0%b2-systemd-flatpak-samba-freerdp-clamav-node-js"},"modified":"2022-01-13T15:37:33","modified_gmt":"2022-01-13T13:37:33","slug":"uyazvimosti-v-systemd-flatpak-samba-freerdp-clamav-node-js","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimosti-v-systemd-flatpak-samba-freerdp-clamav-node-js","title":{"rendered":"\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432  systemd, Flatpak, Samba, FreeRDP, Clamav, Node.js","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Foi descoberta uma vulnerabilidade na ferramenta systemd-tmpfiles, que faz parte do systemd (CVE-2021-3997), permitindo a chamada de recurs\u00e3o incontrol\u00e1vel. O problema pode ser utilizado para provocar uma nega\u00e7\u00e3o de servi\u00e7o durante o processo de inicializa\u00e7\u00e3o do sistema, criando um grande n\u00famero de subdiret\u00f3rios no diret\u00f3rio \/tmp. Uma corre\u00e7\u00e3o est\u00e1 dispon\u00edvel na forma de um patch. Atualiza\u00e7\u00f5es de pacotes com a corre\u00e7\u00e3o foram propostas para Ubuntu e SUSE, mas ainda n\u00e3o est\u00e3o dispon\u00edveis para Debian, RHEL e Fedora (corre\u00e7\u00f5es em fase de testes).     <\/p>\n<p>Ao criar milhares de diret\u00f3rios aninhados, a execu\u00e7\u00e3o da opera\u00e7\u00e3o &#171;systemd-tmpfiles &#8212;remove&#187; resulta em falha devido ao esgotamento da pilha. Normalmente, a ferramenta systemd-tmpfiles executa opera\u00e7\u00f5es de remo\u00e7\u00e3o e cria\u00e7\u00e3o de diret\u00f3rios em uma \u00fanica chamada (&#171;systemd-tmpfiles &#8212;create &#8212;remove &#8212;boot &#8212;exclude-prefix=\\\/dev&#187;), onde a remo\u00e7\u00e3o \u00e9 realizada primeiro e, em seguida, a cria\u00e7\u00e3o. Ou seja, uma falha na fase de remo\u00e7\u00e3o far\u00e1 com que arquivos importantes para o funcionamento, listados em \\\/usr\\\/lib\\\/tmpfiles.d\\\/*.conf, n\u00e3o sejam criados.      <\/p>\n<p>Tamb\u00e9m h\u00e1 um cen\u00e1rio de ataque mais perigoso mencionado para o Ubuntu 21.04: devido \u00e0 falha do systemd-tmpfiles, o arquivo \/run\/lock\/subsys n\u00e3o \u00e9 criado, e o diret\u00f3rio \/run\/lock permite grava\u00e7\u00e3o para todos os usu\u00e1rios. Um invasor pode criar um diret\u00f3rio \/run\/lock\/subsys sob sua pr\u00f3pria identifica\u00e7\u00e3o e, ao criar links simb\u00f3licos que se sobrep\u00f5em aos arquivos de bloqueio dos processos do sistema, pode ocasionar a reescrita de arquivos do sistema.     <\/p>\n<p>Al\u00e9m disso, vale ressaltar a publica\u00e7\u00e3o de novos lan\u00e7amentos dos projetos Flatpak, Samba, FreeRDP, Clamav e Node.js, que corrigiram vulnerabilidades:    <\/p>\n<ul>\n<li class=\"l\"> Nas vers\u00f5es corretivas das ferramentas para a constru\u00e7\u00e3o de pacotes autossuficientes Flatpak 1.10.6 e 1.12.3, duas vulnerabilidades foram corrigidas: A primeira vulnerabilidade (CVE-2021-43860) permite que, ao carregar um pacote de um reposit\u00f3rio n\u00e3o verificado, atrav\u00e9s de manipula\u00e7\u00f5es de metadados, certas permiss\u00f5es avan\u00e7adas sejam ocultadas durante o processo de instala\u00e7\u00e3o. A segunda vulnerabilidade (sem CVE) permite que, durante a constru\u00e7\u00e3o do pacote com o comando &#171;flatpak-builder &#8212;mirror-screenshots-url&#187;, diret\u00f3rios sejam criados na \u00e1rea de sistema de arquivos fora do diret\u00f3rio de constru\u00e7\u00e3o.\n<li class=\"l\">A atualiza\u00e7\u00e3o Samba 4.13.16 corrige uma vulnerabilidade (CVE-2021-43566) que permite a um cliente, atrav\u00e9s da manipula\u00e7\u00e3o de links simb\u00f3licos nas se\u00e7\u00f5es SMB1 ou NFS, conseguir a cria\u00e7\u00e3o em <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-newyork\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2695\">servidor<\/a> cat\u00e1logo fora da \u00e1rea export\u00e1vel do FS (o problema \u00e9 causado por uma condi\u00e7\u00e3o de corrida e \u00e9 dif\u00edcil de explorar na pr\u00e1tica, mas teoricamente poss\u00edvel). O problema afeta vers\u00f5es anteriores a 4.13.16.\n<p>Tamb\u00e9m foi publicado um relat\u00f3rio sobre outra vulnerabilidade similar (CVE-2021-20316), que permite a um cliente autenticado ler ou modificar o conte\u00fado de arquivos ou metadados de diret\u00f3rios na \u00e1rea do FS atrav\u00e9s da manipula\u00e7\u00e3o de links simb\u00f3licos. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-los-angeles\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3788\">servidor<\/a> fora da se\u00e7\u00e3o export\u00e1vel. O problema foi resolvido na vers\u00e3o 4.15.0, mas afeta vers\u00f5es anteriores. No entanto, n\u00e3o ser\u00e3o publicadas corre\u00e7\u00f5es para as vers\u00f5es mais antigas, pois a antiga arquitetura do VFS do Samba n\u00e3o permite resolver o problema devido \u00e0 vincula\u00e7\u00e3o das opera\u00e7\u00f5es de metadados aos caminhos dos arquivos (no Samba 4.15, a camada VFS foi completamente reformulada). O perigo do problema \u00e9 mitigado pelo fato de que ele \u00e9 bastante complexo de explorar e as permiss\u00f5es do usu\u00e1rio devem permitir leitura ou escrita no arquivo ou diret\u00f3rio alvo.      <\/p>\n<li class=\"l\"> Na vers\u00e3o do projeto FreeRDP 2.5, que oferece uma implementa\u00e7\u00e3o livre do protocolo de acesso remoto a \u00e1rea de trabalho RDP (Remote Desktop Protocol), foram resolvidos tr\u00eas problemas de seguran\u00e7a (identificadores CVE n\u00e3o atribu\u00eddos), que podem levar a um estouro de buffer ao usar uma localidade incorreta, processar par\u00e2metros de registro especialmente formatados e especificar um nome de complemento formatado incorretamente. Entre as mudan\u00e7as na nova vers\u00e3o, destaca-se o suporte \u00e0 biblioteca OpenSSL 3.0, a implementa\u00e7\u00e3o da configura\u00e7\u00e3o TcpConnectTimeout, melhorias na compatibilidade com LibreSSL e a resolu\u00e7\u00e3o de problemas com a \u00e1rea de transfer\u00eancia em ambientes baseados em Wayland.\n<li class=\"l\"> Nas novas vers\u00f5es do pacote antiv\u00edrus livre ClamAV 0.103.5 e 0.104.2, foi corrigida a vulnerabilidade CVE-2022-20698, relacionada \u00e0 leitura incorreta de ponteiros, permitindo que um processo falhe remotamente, caso o pacote tenha sido compilado com a biblioteca libjson-c e a op\u00e7\u00e3o CL_SCAN_GENERAL_COLLECT_METADATA (clamscan &#8212;gen-json) esteja habilitada.\n<li class=\"l\"> As atualiza\u00e7\u00f5es da plataforma Node.js 16.13.2, 14.18.3, 17.3.1 e 12.22.9 corrigiram quatro vulnerabilidades: contorno da verifica\u00e7\u00e3o de certificado ao verificar a conex\u00e3o de rede devido \u00e0 convers\u00e3o incorreta de SAN (Subject Alternative Names) para o formato de string (CVE-2021-44532); tratamento incorreto da enumera\u00e7\u00e3o de v\u00e1rios valores nos campos subject e issuer, que pode ser usado para contornar a verifica\u00e7\u00e3o desses campos em certificados (CVE-2021-44533); contorno das restri\u00e7\u00f5es relacionadas ao SAN do tipo URI em certificados (CVE-2021-44531); verifica\u00e7\u00e3o insuficiente de entradas na fun\u00e7\u00e3o console.table(), que pode ser utilizada para atribuir strings vazias a chaves num\u00e9ricas (CVE-2022-21824).          <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56498\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 systemd \u0443\u0442\u0438\u043b\u0438\u0442\u0435 systemd-tmpfiles \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3997), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043d\u0435\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u0443\u0435\u043c\u0443\u044e \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u044e. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043e\u0442\u043a\u0430\u0437\u0430 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0447\u0435\u0440\u0435\u0437 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0432 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0435 \/tmp \u0431\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u0447\u0438\u0441\u043b\u0430 \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u043f\u043e\u0434\u043a\u0430\u0442\u0430\u043b\u043e\u0433\u043e\u0432. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u043a\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0432 \u0444\u043e\u0440\u043c\u0435 \u043f\u0430\u0442\u0447\u0430. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u044b \u0432 Ubuntu \u0438 SUSE, \u043d\u043e \u043f\u043e\u043a\u0430 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u0432 [&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-102953","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=\"\u0412\u043e \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 systemd \u0443\u0442\u0438\u043b\u0438\u0442\u0435 systemd-tmpfiles \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3997), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0437\u0432\u0430\u0442\u044c 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