{"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\/cs\/blog\/news\/udalyonnoe-vypolnenie-koda-v-forke-pochtovogo-servera-qmail-ot-proekta-sagredo","title":{"rendered":"Vzd\u00e1len\u00e9 prov\u00e1d\u011bn\u00ed k\u00f3du ve fork\u011b po\u0161tovn\u00edho serveru qmail od projektu Sagredo","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V rozv\u00edjen\u00e9m projektu Sagredo forku po\u0161tovn\u00edho serveru qmail byla zji\u0161t\u011bna zranitelnost (CVE-2026-41113), kter\u00e1 umo\u017e\u0148uje dosa\u017een\u00ed vzd\u00e1len\u00e9ho prov\u00e1d\u011bn\u00ed libovoln\u00fdch p\u0159\u00edkaz\u016f na serveru s pr\u00e1vy u\u017eivatele qmailr. Zranitelnost je zp\u016fsobena nedostatkem escapov\u00e1n\u00ed speci\u00e1ln\u00edch znak\u016f v n\u00e1zvu hostitele, kter\u00fd vrac\u00ed DNS server p\u0159i ur\u010dov\u00e1n\u00ed MX br\u00e1ny, v kombinaci s p\u0159ed\u00e1n\u00edm z\u00edskan\u00e9ho n\u00e1zvu do p\u0159\u00edkazu popen bez \u0159\u00e1dn\u00e9ho odd\u011blen\u00ed a filtrov\u00e1n\u00ed argument\u016f p\u0159i vol\u00e1n\u00ed shellu. Zranitelnost byla odstran\u011bna ve vyd\u00e1n\u00ed 2026.04.07. V otev\u0159en\u00e9m p\u0159\u00edstupu byl zve\u0159ejn\u011bn n\u00e1stroj pro zneu\u017eit\u00ed t\u00e9to zranitelnosti. <\/p>\n

V \u0159\u00edjnu 2024 p\u0159idal projekt Sagredo do utility qmail-remote zm\u011bnu, kter\u00e1 zav\u00e1d\u00ed funkci «notlshosts_auto», je\u017e si pam\u011bt\u00e1 hostitele s nespr\u00e1vnou implementac\u00ed protokolu TLS, s nimi\u017e nen\u00ed mo\u017en\u00e9 nav\u00e1zat TLS spojen\u00ed, aby se p\u0159ede\u0161lo cyklen\u00ed zn\u00e1m\u00fdch chybov\u00fdch odesl\u00e1n\u00ed e-mail\u016f na takov\u00e9 hostitele. <\/p>\n

Probl\u00e9m spo\u010d\u00edv\u00e1 v tom, \u017ee ukl\u00e1d\u00e1n\u00ed n\u00e1zvu hostitele bylo prov\u00e1d\u011bno spu\u0161t\u011bn\u00edm p\u0159\u00edkazov\u00e9ho shellu pomoc\u00ed funkce popen() s argumentem «\\\/bin\\\/touch %s\\\/control\\\/notlshosts\\\/’%s'», do kter\u00e9ho bylo vlo\u017eeno jm\u00e9no MX-hostitele vr\u00e1cen\u00e9 DNS serverem. \u00dato\u010dn\u00edk mohl spustit sv\u016fj DNS server, kter\u00fd vracel v DNS z\u00e1znamech MX jm\u00e9no ve form\u00e1tu «x’`id>\\\/tmp\\\/pwned`’y.evil.com» a dos\u00e1hnout vykon\u00e1n\u00ed vlo\u017een\u00e9ho k\u00f3du, co\u017e vytvo\u0159ilo podm\u00ednky pro zavol\u00e1n\u00ed funkce pro ulo\u017een\u00ed n\u00e1zvu chybn\u00fdch e-mail\u016f. serveru<\/a>.
\n
Zdroj: 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\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\udd47 Vzd\u00e1len\u00e9 prov\u00e1d\u011bn\u00ed k\u00f3du ve forku po\u0161tovn\u00edho serveru qmail od projektu Sagredo | ProHoster","description":"V rozv\u00edjen\u00e9m projektu Sagredo forku po\u0161tovn\u00edho serveru qmail byla zji\u0161t\u011bna zranitelnost (CVE-2026-41113), kter\u00e1 umo\u017e\u0148uje dosa\u017een\u00ed vzd\u00e1len\u00e9ho prov\u00e1d\u011bn\u00ed libovoln\u00fdch p\u0159\u00edkaz\u016f na serveru s pr\u00e1vy u\u017eivatele qmailr.","canonical_url":"https:\/\/prohoster.info\/cs\/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":"cs_CZ","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 \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.","og:url":"https:\/\/prohoster.info\/cs\/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\/cs\/wp-json\/wp\/v2\/posts\/169325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=169325"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/169325\/revisions"}],"predecessor-version":[{"id":170739,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/169325\/revisions\/170739"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=169325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=169325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=169325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}