{"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\/da\/blog\/news\/udalyonnoe-vypolnenie-koda-v-forke-pochtovogo-servera-qmail-ot-proekta-sagredo","title":{"rendered":"Fjernudf\u00f8relse af kode i qmail-postserver-fork fra Sagredo-projektet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I det udviklede projekt Sagredo's fork af mailserveren qmail er der identificeret en s\u00e5rbarhed (CVE-2026-41113), der tillader fjernudf\u00f8relse af vilk\u00e5rlige kommandoer p\u00e5 serveren med rettighederne fra brugeren qmailr. S\u00e5rbarheden skyldes mangel p\u00e5 escape af specialtegn i hostname, der returneres af DNS-serveren under bestemmelsen af MX-gatewayen, kombineret med overf\u00f8rsel af det modtagne navn til popen-kommandoen uden ordentlig adskillelse og filtrering af argumenter ved kald af shell. S\u00e5rbarheden blev rettet i udgivelsen den 2026.04.07. Et v\u00e6rkt\u00f8j til udnyttelse af s\u00e5rbarheden er offentliggjort. <\/p>\n

I oktober 2024 tilf\u00f8jede Sagredo en \u00e6ndring til qmail-remote-nytteprogrammet, der introducerede funktionen «notlshosts_auto», som husker v\u00e6rter med forkert implementering af TLS-protokollen, som ikke kan oprette TLS-forbindelse, for at forhindre gentagen fejlsendt e-mail til s\u00e5danne v\u00e6rter. <\/p>\n

Problemet er, at navnet p\u00e5 v\u00e6rten blev gemt ved at k\u00f8re kommandolinjen ved hj\u00e6lp af funktionen popen() med argumentet «\\\/bin\\\/touch %s\\\/control\\\/notlshosts\\\/’%s'», hvor navnet p\u00e5 MX-v\u00e6rten, der blev returneret af DNS-serveren, blev indsat. En angriber kunne k\u00f8re sin egen DNS-server, der returnerede en DNS-post for MX med navnet «x’`id>\\\/tmp\\\/pwned`’y.evil.com», og f\u00e5 underkastet den indsat kode ved at skabe betingelser for at kalde funktionen til at gemme navnet p\u00e5 den fejlslagne mailserver. server<\/a>.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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identificeret en s\u00e5rbarhed (CVE-2026-41113), der tillader fjernudf\u00f8relse af vilk\u00e5rlige kommandoer p\u00e5 serveren med rettighederne fra brugeren qmailr.","canonical_url":"https:\/\/prohoster.info\/da\/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":"da_DK","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 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qmailr.","og:url":"https:\/\/prohoster.info\/da\/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\/da\/wp-json\/wp\/v2\/posts\/169325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/comments?post=169325"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/169325\/revisions"}],"predecessor-version":[{"id":170739,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/169325\/revisions\/170739"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media?parent=169325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/categories?post=169325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/tags?post=169325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}