{"id":151908,"date":"2025-12-17T23:11:58","date_gmt":"2025-12-17T21:11:58","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-pochtovogo-servera-exim-4-99-1-s-ustraneniem-uyazvimosti"},"modified":"2025-12-17T23:11:58","modified_gmt":"2025-12-17T21:11:58","slug":"obnovlenie-pochtovogo-servera-exim-4-99-1-s-ustraneniem-uyazvimosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/obnovlenie-pochtovogo-servera-exim-4-99-1-s-ustraneniem-uyazvimosti","title":{"rendered":"Aktualiz\u00e1cia po\u0161tov\u00e9ho servera Exim 4.99.1 na odstr\u00e1nenie zranite\u013enosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Bola vydan\u00e1 oprava po\u0161tov\u00e9ho servera Exim 4.99.1, ktor\u00e1 rie\u0161i zranite\u013enos\u0165 (CVE-2025-67896), umo\u017e\u0148uj\u00facu vzdialen\u00e9mu \u00fato\u010dn\u00edkovi po\u0161kodi\u0165 obsah pam\u00e4te mimo vyhraden\u00e9ho z\u00e1sobn\u00edka. Probl\u00e9m by mohol by\u0165 vyu\u017eit\u00fd na vzdialen\u00e9 vykon\u00e1vanie k\u00f3du na serveri, av\u0161ak zatia\u013e nebol vytvoren\u00fd funk\u010dn\u00fd exploit. <\/p>\n

Zranite\u013enos\u0165 sa nach\u00e1dza v k\u00f3de pre pr\u00e1cu s internou DB (Hints DB) zalo\u017eenou na SQLite, ktor\u00e1 sa pou\u017e\u00edva na uchov\u00e1vanie do\u010dasn\u00fdch inform\u00e1ci\u00ed, stavu doru\u010dovania spr\u00e1v a \u00fadajov o intenzite odosielania e-mailov. Probl\u00e9m je sp\u00f4soben\u00fd t\u00fdm, \u017ee z\u00e1znamy z DB sa priamo prev\u00e1dzali do vn\u00fatornej \u0161trukt\u00fary «dbdata_ratelimit_unique» bez riadneho overenia. Vznikla situ\u00e1cia, ke\u010f sa vytvoril pevn\u00fd pole «bloom», ve\u013ekosti 40 bajtov, pri\u010dom obsah po\u013ea «bloom_size», ur\u010duj\u00faceho po\u010det zapisovan\u00fdch do po\u013ea prvkov, z\u00e1visel od ve\u013ekosti \u00fadajov v DB. \u00dato\u010dn\u00edk mohol organizova\u0165 z\u00e1pis mimo priraden\u00e9ho vyrovn\u00e1vacieho priestoru, vlo\u017een\u00edm \u00fadajov do DB (vyu\u017eit\u00edm \u010fal\u0161ej zranite\u013enosti), pri ktor\u00fdch pole «bloom_size» nadobudlo hodnotu, zjavne v\u00e4\u010d\u0161iu, ne\u017e je ve\u013ekos\u0165 po\u013ea. <\/p>\n

Probl\u00e9m sa prejavuje vo vydaniach Exim 4.99 a 4.98.2 a t\u00fdka sa iba konfigur\u00e1ci\u00ed s ACL ratelimit, v ktor\u00fdch sa pou\u017e\u00edvaj\u00fa parametre «unique» alebo «per_addr» (napr\u00edklad «warn ratelimit = 100 \/ 1h \/ per_addr \/ $sender_address» alebo «warn ratelimit = 100 \/ 1h \/ per_rcpt \/ unique=$sender_address»). Okrem toho, aby mohol \u00fato\u010dn\u00edk vykona\u0165 \u00fatok, mus\u00ed by\u0165 Exim zostaven\u00fd s podporou SQLite (USE_SQLITE=yes), aktivovanou v konfigura\u010dnom s\u00fabore (hints_database = sqlite). V zranite\u013enej konfigur\u00e1cii sa pri spusten\u00ed «exim -bV» zobrazuje «Hints DB: Using sqlite3». <\/p>\n

Z v\u00e4\u010d\u0161\u00edch distrib\u00faci\u00ed boli probl\u00e9mov\u00e9 verzie pou\u017e\u00edvan\u00e9 v Debian 13, Ubuntu 25.10, SUSE\/openSUSE, Arch Linux, Fedora a FreeBSD. RHEL a odvozen\u00e9 distrib\u00facie nie s\u00fa postihnut\u00e9 probl\u00e9mom, preto\u017ee Exim nie je s\u00fa\u010das\u0165ou ich ofici\u00e1lneho repozit\u00e1ra bal\u00edkov (v EPEL zatia\u013e nebolo vydan\u00e9 aktualizovan\u00e9 balenie exim). <\/p>\n

Takisto sa zaznamen\u00e1va objavenie nov\u00e9ho vektora na zneu\u017eitie zranite\u013enosti CVE-2025-26794, odstr\u00e1nenej vo febru\u00e1rovom vydan\u00ed Exim 4.98.1. Zranite\u013enos\u0165 umo\u017e\u0148uje vykona\u0165 substit\u00faciu SQL k\u00f3du do internej DB (Hints DB). Predt\u00fdm pridan\u00e1 oprava neescapovala jednoduch\u00e9 \u00favodzovky. Pr\u00edklad pr\u00edkazu MAIL FROM, ktor\u00fd vedie k substit\u00facii SQL k\u00f3du: «MAIL FROM:<«x’\/**\/UNION\/**\/SELECT\/**\/X'<hex_blob>’—«@attacker.com>». T\u00e1to zranite\u013enos\u0165 m\u00f4\u017ee by\u0165 pou\u017eit\u00e1 ako po\u010diato\u010dn\u00fd \u010dl\u00e1nok na vytvorenie podmienok na vznik vy\u0161\u0161ie pop\u00edsan\u00e9ho prete\u010denia vyrovn\u00e1vacieho priestoru.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Exim 4.99.1, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-67896), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u043f\u043e\u0432\u0440\u0435\u0434\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 \u0432\u043d\u0435 \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430. 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\u0431\u0430\u0437\u0435 SQLite, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0439 \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-151908","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\udd47Aktualiz\u00e1cia po\u0161tov\u00e9ho servera Exim 4.99.1 so odstr\u00e1nen\u00edm zranite\u013enosti | ProHoster","description":"Bol zverejnen\u00fd opraven\u00fd release po\u0161tov\u00e9ho servera Exim 4.99.1, v ktorom sa odstr\u00e1nila zranite\u013enos\u0165 (CVE-2025-67896), ktor\u00e1 umo\u017e\u0148uje vzdialen\u00e9mu \u00fato\u010dn\u00edkovi po\u0161kodi\u0165 obsah pam\u00e4te mimo vyhraden\u00e9ho vyrovn\u00e1vacej pam\u00e4te.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/obnovlenie-pochtovogo-servera-exim-4-99-1-s-ustraneniem-uyazvimosti","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","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\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e 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\u0431\u0443\u0444\u0435\u0440\u0430.","og:url":"https:\/\/prohoster.info\/sk\/blog\/news\/obnovlenie-pochtovogo-servera-exim-4-99-1-s-ustraneniem-uyazvimosti","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":"2025-12-17T21:11:58+00:00","article:modified_time":"2025-12-17T21:11:58+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"151908","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-01-20 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