{"id":170353,"date":"2026-05-04T12:24:42","date_gmt":"2026-05-04T10:24:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej"},"modified":"2026-05-04T12:24:42","modified_gmt":"2026-05-04T10:24:42","slug":"vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","title":{"rendered":"Lan\u00e7amento do Dropbear SSH 2026.90 com corre\u00e7\u00e3o de vulnerabilidades","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Foi publicado o lan\u00e7amento do projeto Dropbear 2026.90, que desenvolve um servidor e cliente SSH, amplamente utilizado em roteadores sem fio e distribui\u00e7\u00f5es compactas, como o OpenWrt. O Dropbear se destaca pelo baixo consumo de mem\u00f3ria, a possibilidade de desativar funcionalidades desnecess\u00e1rias durante a constru\u00e7\u00e3o e o suporte para a constru\u00e7\u00e3o do cliente e do servidor em um \u00fanico arquivo execut\u00e1vel, semelhante ao busybox. Quando vinculado estaticamente com o uClibc, o arquivo execut\u00e1vel do Dropbear ocupa apenas 110kB. O Dropbear suporta redirecionamento X11, \u00e9 compat\u00edvel com o arquivo de chaves OpenSSH (~\/.ssh\/authorized_keys) e pode criar conex\u00f5es m\u00faltiplas com redirecionamento atrav\u00e9s de um host intermedi\u00e1rio. O c\u00f3digo do projeto \u00e9 escrito em C e \u00e9 distribu\u00eddo sob uma licen\u00e7a pr\u00f3xima \u00e0 MIT.      <\/p>\n<p>Na nova vers\u00e3o, v\u00e1rias quest\u00f5es de seguran\u00e7a foram corrigidas:  <\/p>\n<ul>\n<li class=\"l\"> Corre\u00e7\u00e3o incompleta da vulnerabilidade em scp (CVE-2019-6111), que permite sobrescrever outros arquivos ao conectar-se a um host malicioso. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-shicago\/\" title=\"servidor\" data-wpil-keyword-link=\"linked\">servidor<\/a>. Ao usar scp, <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\">servidor<\/a> decide quais arquivos e diret\u00f3rios enviar para o cliente, enquanto o cliente apenas verifica a corre\u00e7\u00e3o dos nomes dos objetos recebidos. A verifica\u00e7\u00e3o do lado do cliente bloqueia a sa\u00edda do diret\u00f3rio atual (&#171;..&#187;), mas, em caso de c\u00f3pia recursiva (-r), n\u00e3o considera casos de transfer\u00eancia de diret\u00f3rios com nomes diferentes dos originalmente solicitados. O problema foi resolvido atrav\u00e9s da proibi\u00e7\u00e3o do uso da op\u00e7\u00e3o &#171;-r&#187; com um diret\u00f3rio de destino j\u00e1 existente.\n<li class=\"l\"> Uma vulnerabilidade (CVE-2026-35385) na ferramenta scp, que faz com que, ap\u00f3s o download de um arquivo com permiss\u00f5es root usando a op\u00e7\u00e3o &#171;-O&#187; e sem a op\u00e7\u00e3o &#171;-p&#187;, os flags setuid\/setgid n\u00e3o sejam limpos.\n<li class=\"l\"> Possibilidade de contornar a execu\u00e7\u00e3o do comando &#171;forced_command&#187; nas configura\u00e7\u00f5es de authorized_keys ao conectar um usu\u00e1rio autenticado utilizando a op\u00e7\u00e3o &#171;-t&#187; (login com verifica\u00e7\u00e3o de senha e chave p\u00fablica).\n<li class=\"l\"> Nega\u00e7\u00e3o de servi\u00e7o atrav\u00e9s da cria\u00e7\u00e3o de um arquivo especial com o nome authorized_keys, bloqueando opera\u00e7\u00f5es de leitura por um usu\u00e1rio local.\n<li class=\"l\"> Leitura de dados fora da \u00e1rea de buffer ao criar manipuladores para redirecionamento de solicita\u00e7\u00f5es de cliente e servidor, o que pode levar ao fechamento de descritores de arquivos arbitr\u00e1rios.    <\/ul>\n<p>Altera\u00e7\u00f5es n\u00e3o relacionadas \u00e0 seguran\u00e7a:  <\/p>\n<ul>\n<li class=\"l\"> No ssh, a op\u00e7\u00e3o &#171;-R&#187; foi adicionada para encaminhar sockets unix atrav\u00e9s de um t\u00fanel SSH.\n<li class=\"l\"> No ssd, a op\u00e7\u00e3o &#171;-M&#187; foi adicionada para limitar a dura\u00e7\u00e3o m\u00e1xima da sess\u00e3o.\n<li class=\"l\"> Na &#171;authorized_keys&#187;, foi adicionada a op\u00e7\u00e3o &#171;permitlisten&#187; para restringir as portas permitidas.\n<li class=\"l\"> O suporte para chaves RSA geradas no dropbearkey 0.32 ou vers\u00f5es anteriores dessa ferramenta foi descontinuado, pois est\u00e3o suscet\u00edveis a ataques de canal lateral, que avaliam a diferen\u00e7a no tempo de processamento de dados que foram e n\u00e3o foram armazenados em cache.\n<li class=\"l\"> Para bloquear tentativas de quebra de chaves abertas em hosts, o n\u00famero de solicita\u00e7\u00f5es de chaves abertas \u00e9 limitado a 15 tentativas por sess\u00e3o.        <\/ul>\n<p>Fonte: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65356\">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 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Dropbear 2026.90, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440 \u0438 \u043a\u043b\u0438\u0435\u043d\u0442 SSH, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0439 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430\u0445 \u0438 \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u044b\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445, \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 OpenWrt. Dropbear \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u043d\u0438\u0437\u043a\u0438\u043c \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435\u043c \u043f\u0430\u043c\u044f\u0442\u0438, \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c\u044e \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u043b\u0438\u0448\u043d\u0435\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043d\u0430 \u044d\u0442\u0430\u043f\u0435 \u0441\u0431\u043e\u0440\u043a\u0438 \u0438 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u043e\u0439 \u0441\u0431\u043e\u0440\u043a\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0432 \u043e\u0434\u043d\u043e\u043c \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u043c \u0444\u0430\u0439\u043b\u0435 \u043f\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0438 \u0441 busybox. \u041f\u0440\u0438 \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u043c \u0441\u0432\u044f\u0437\u044b\u0432\u0430\u043d\u0438\u0438 \u0441 uClibc \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0439 \u0444\u0430\u0439\u043b Dropbear \u0437\u0430\u043d\u0438\u043c\u0430\u0435\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-170353","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 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Dropbear 2026.90, 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OpenWrt.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","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\u044b\u043f\u0443\u0441\u043a Dropbear SSH 2026.90 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 | ProHoster","og:description":"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 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OpenWrt.","og:url":"https:\/\/prohoster.info\/pt\/blog\/news\/vypusk-dropbear-ssh-2026-90-s-ustraneniem-uyazvimostej","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-05-04T10:24:42+00:00","article:modified_time":"2026-05-04T10:24:42+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/170353","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/comments?post=170353"}],"version-history":[{"count":2,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/170353\/revisions"}],"predecessor-version":[{"id":173160,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/170353\/revisions\/173160"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/media?parent=170353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/categories?post=170353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/tags?post=170353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}