{"id":169325,"date":"2026-04-19T11:11:58","date_gmt":"2026-04-19T09:11:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonnoe-vypolnenie-koda-v-forke-pochtovogo-servera-qmail-ot-proekta-sagredo"},"modified":"2026-04-19T11:11:58","modified_gmt":"2026-04-19T09:11:58","slug":"udalyonnoe-vypolnenie-koda-v-forke-pochtovogo-servera-qmail-ot-proekta-sagredo","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/udalyonnoe-vypolnenie-koda-v-forke-pochtovogo-servera-qmail-ot-proekta-sagredo","title":{"rendered":"Execu\u00e7\u00e3o remota de c\u00f3digo no fork do servidor de e-mail qmail do projeto Sagredo","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No projeto em desenvolvimento do fork do servidor de correio qmail, uma vulnerabilidade (CVE-2026-41113) foi identificada, permitindo a execu\u00e7\u00e3o remota de comandos arbitr\u00e1rios no servidor com os direitos do usu\u00e1rio qmailr. A vulnerabilidade \u00e9 causada pela falta de escape de caracteres especiais no nome do host retornado pelo servidor DNS ao determinar o gateway MX, combinada com a passagem do nome obtido para o comando popen sem a devida separa\u00e7\u00e3o e filtragem de argumentos ao chamar o shell. A vulnerabilidade foi corrigida na vers\u00e3o 2026.04.07. Um kit de ferramentas para explora\u00e7\u00e3o da vulnerabilidade foi publicado em acesso aberto. <\/p>\n

Em outubro de 2024, o projeto Sagredo fez uma altera\u00e7\u00e3o na ferramenta qmail-remote, adicionando a fun\u00e7\u00e3o «notlshosts_auto», que memoriza hosts com implementa\u00e7\u00e3o incorreta do protocolo TLS, com os quais n\u00e3o \u00e9 poss\u00edvel estabelecer uma conex\u00e3o TLS, para evitar o looping de tentativas de envio de e-mail para esses hosts com falha. <\/p>\n

O problema \u00e9 que a grava\u00e7\u00e3o do nome do host era realizada atrav\u00e9s da execu\u00e7\u00e3o de um shell command utilizando a fun\u00e7\u00e3o popen() com o argumento «\\\/bin\\\/touch %s\\\/control\\\/notlshosts\\\/’%s'», no qual o nome do host MX retornado pelo servidor DNS era inserido. Um atacante poderia iniciar seu pr\u00f3prio servidor DNS, que retornasse em registros DNS MX um nome do tipo «x’`id>\\\/tmp\\\/pwned`’y.evil.com», e conseguir a execu\u00e7\u00e3o do c\u00f3digo inserido, criando condi\u00e7\u00f5es para a chamada da fun\u00e7\u00e3o respons\u00e1vel por salvar o nome do host com falha. servidor<\/a>.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c Sagredo \u0444\u043e\u0440\u043a\u0435 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 qmail \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-41113), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u043a\u043e\u043c\u0430\u043d\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f qmailr. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u044d\u043a\u0440\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u043f\u0435\u0446\u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 \u0432 \u0438\u043c\u0435\u043d\u0438 \u0445\u043e\u0441\u0442\u0430, \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c\u043e\u0433\u043e DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0438 MX-\u0448\u043b\u044e\u0437\u0430, \u0432 \u0441\u043e\u0447\u0435\u0442\u0430\u043d\u0438\u0438 \u0441 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0435\u0439 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043d\u043e\u0433\u043e \u0438\u043c\u0435\u043d\u0438 \u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u0443 popen \u0431\u0435\u0437 \u0434\u043e\u043b\u0436\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0438 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correio qmail, foi identificada uma vulnerabilidade (CVE-2026-41113) que permite a execu\u00e7\u00e3o remota de comandos arbitr\u00e1rios no servidor com os direitos do usu\u00e1rio qmailr.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/udalyonnoe-vypolnenie-koda-v-forke-pochtovogo-servera-qmail-ot-proekta-sagredo","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\u0423\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 \u0432 \u0444\u043e\u0440\u043a\u0435 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 qmail \u043e\u0442 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Sagredo | ProHoster","og:description":"\u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c Sagredo \u0444\u043e\u0440\u043a\u0435 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 qmail \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-41113), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u043a\u043e\u043c\u0430\u043d\u0434 \u043d\u0430 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qmailr.","og:url":"https:\/\/prohoster.info\/pt\/blog\/news\/udalyonnoe-vypolnenie-koda-v-forke-pochtovogo-servera-qmail-ot-proekta-sagredo","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":"2026-04-19T09:11:58+00:00","article:modified_time":"2026-04-19T09:11:58+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\/169325","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=169325"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/169325\/revisions"}],"predecessor-version":[{"id":170739,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/169325\/revisions\/170739"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/media?parent=169325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/categories?post=169325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/tags?post=169325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}