{"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\/es\/blog\/news\/udalyonnoe-vypolnenie-koda-v-forke-pochtovogo-servera-qmail-ot-proekta-sagredo","title":{"rendered":"Ejecuci\u00f3n remota de c\u00f3digo en el fork del servidor de correo qmail del proyecto Sagredo","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En el proyecto en desarrollo Sagredo, se ha identificado una vulnerabilidad (CVE-2026-41113) en el fork del servidor de correo qmail, que permite la ejecuci\u00f3n remota de comandos arbitrarios en el servidor con los privilegios del usuario qmailr. La vulnerabilidad se debe a la falta de escape de caracteres especiales en el nombre del host, devuelto por el servidor DNS al determinar el gateway MX, combinado con la transmisi\u00f3n del nombre obtenido en el comando popen sin la debida separaci\u00f3n y filtrado de argumentos al invocar el shell. La vulnerabilidad ha sido corregida en la versi\u00f3n 2026.04.07. Se ha publicado en acceso abierto un conjunto de herramientas para explotar esta vulnerabilidad. <\/p>\n

En octubre de 2024, el proyecto Sagredo realiz\u00f3 un cambio en la utilidad qmail-remote, a\u00f1adiendo la funci\u00f3n «notlshosts_auto», que memoriza los hosts con una implementaci\u00f3n incorrecta del protocolo TLS, con los que no se puede establecer una conexi\u00f3n TLS, para evitar un bucle de env\u00edo fallido de correos a dichos hosts. <\/p>\n

El problema es que el nombre del host se guardaba mediante el lanzamiento de una shell a trav\u00e9s de la funci\u00f3n popen() con el argumento «\\\/bin\\\/touch %s\\\/control\\\/notlshosts\\\/’%s'», en el que se insertaba el nombre del host MX devuelto por el servidor DNS. Un atacante pod\u00eda lanzar su propio servidor DNS, que retornara un nombre de tipo «x’`id>\\\/tmp\\\/pwned`’y.evil.com» en los registros DNS MX, logrando as\u00ed la ejecuci\u00f3n del c\u00f3digo insertado, creando las condiciones para invocar la funci\u00f3n de guardar el nombre del correo fallido. servidores<\/a>.
\n
Fuente: 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 \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u043e\u0432 \u043f\u0440\u0438 \u0432\u044b\u0437\u043e\u0432\u0435 shell. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c […]<\/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-169325","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Ejecuci\u00f3n remota de c\u00f3digo en el fork del servidor de correo qmail del proyecto Sagredo | ProHoster","description":"En el proyecto en desarrollo Sagredo, se ha identificado una vulnerabilidad (CVE-2026-41113) en el fork del servidor de correo qmail, que permite la ejecuci\u00f3n remota de comandos arbitrarios en el servidor con los privilegios del usuario qmailr.","canonical_url":"https:\/\/prohoster.info\/es\/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":"es_ES","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\/es\/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\/es\/wp-json\/wp\/v2\/posts\/169325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/comments?post=169325"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/posts\/169325\/revisions"}],"predecessor-version":[{"id":170739,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/posts\/169325\/revisions\/170739"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/media?parent=169325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/categories?post=169325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/tags?post=169325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}