{"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\/hu\/blog\/news\/obnovlenie-pochtovogo-servera-exim-4-99-1-s-ustraneniem-uyazvimosti","title":{"rendered":"Az Exim 4.99.1 levelez\u0151 szerver friss\u00edt\u00e9se a sebezhet\u0151s\u00e9g megsz\u00fcntet\u00e9s\u00e9vel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Megjelent az Exim 4.99.1 levelez\u0151szerver jav\u00edt\u00f3 kiad\u00e1sa, amely megsz\u00fcnteti a (CVE-2025-67896) sebezhet\u0151s\u00e9get, amely lehet\u0151v\u00e9 teszi t\u00e1voli t\u00e1mad\u00f3k sz\u00e1m\u00e1ra a mem\u00f3ria tartalm\u00e1nak megs\u00e9rt\u00e9s\u00e9t a kijel\u00f6lt puffer\u00e9n k\u00edv\u00fcl. Potenci\u00e1lisan ez a probl\u00e9ma t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1sra is haszn\u00e1lhat\u00f3 a szerveren, de m\u0171k\u00f6d\u0151 exploit m\u00e9g nem k\u00e9sz\u00fclt. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g a bels\u0151 adatb\u00e1zis (Hints DB) kezel\u00e9s\u00e9re szolg\u00e1l\u00f3 k\u00f3dban tal\u00e1lhat\u00f3, amely SQLite alap\u00fa \u00e9s id\u0151beli inform\u00e1ci\u00f3k, \u00fczenetk\u00e9zbes\u00edt\u00e9si \u00e1llapotok \u00e9s az e-mailek k\u00fcld\u00e9s\u00e9nek intenzit\u00e1s\u00e1r\u00f3l sz\u00f3l\u00f3 inform\u00e1ci\u00f3kat t\u00e1rol. A probl\u00e9ma abb\u00f3l ad\u00f3dik, hogy az adatb\u00e1zisb\u00f3l sz\u00e1rmaz\u00f3 rekordok k\u00f6zvetlen\u00fcl a bels\u0151 'dbdata_ratelimit_unique' strukt\u00far\u00e1ba konvert\u00e1l\u00f3dtak megfelel\u0151 ellen\u0151rz\u00e9s n\u00e9lk\u00fcl. Olyan helyzet alakult ki, ahol egy 40 b\u00e1jt m\u00e9ret\u0171 statikus 'bloom' t\u00f6mb j\u00f6tt l\u00e9tre, m\u00edg a 'bloom_size' mez\u0151, amely az elemek sz\u00e1m\u00e1t defini\u00e1lja a t\u00f6mbben, az adatb\u00e1zisban l\u00e9v\u0151 adatok m\u00e9ret\u00e9t\u0151l f\u00fcgg\u00f6tt. A t\u00e1mad\u00f3 k\u00e9pes volt meghaladj\u00e1k az allok\u00e1lt puffert az\u00e1ltal, hogy az adatb\u00e1zisba olyan adatokat helyezett el (m\u00e1sik s\u00e9r\u00fcl\u00e9kenys\u00e9get kihaszn\u00e1lva), ami miatt a 'bloom_size' mez\u0151 \u00e9rt\u00e9ke sz\u00e1nd\u00e9kosan nagyobb lett, mint a t\u00f6mb m\u00e9rete. <\/p>\n

A probl\u00e9ma az Exim 4.99 \u00e9s 4.98.2 verzi\u00f3iban jelentkezik, \u00e9s kiz\u00e1r\u00f3lag az ACL ratelimit konfigur\u00e1ci\u00f3it \u00e9rinti, ahol a 'unique' vagy 'per_addr' param\u00e9terek vannak haszn\u00e1latban (p\u00e9ld\u00e1ul: 'warn ratelimit = 100 \/ 1h \/ per_addr \/ $sender_address' vagy 'warn ratelimit = 100 \/ 1h \/ per_rcpt \/ unique=$sender_address'). Tov\u00e1bb\u00e1 ahhoz, hogy a t\u00e1mad\u00e1s v\u00e9grehajthat\u00f3 legyen, az Eximnek SQLite t\u00e1mogat\u00e1ssal kell rendelkeznie (USE_SQLITE=yes), amelyet a konfigur\u00e1ci\u00f3s f\u00e1jlban kell aktiv\u00e1lni (hints_database = sqlite). A s\u00e9r\u00fcl\u00e9keny konfigur\u00e1ci\u00f3ban a 'exim -bV' parancs futtat\u00e1sakor a k\u00f6vetkez\u0151 \u00fczenet jelenik meg: 'Hints DB: Using sqlite3'. <\/p>\n

A nagyobb disztrib\u00faci\u00f3kban a probl\u00e9m\u00e1s verzi\u00f3kat a Debian 13, az Ubuntu 25.10, a SUSE\/openSUSE, az Arch Linux, a Fedora \u00e9s a FreeBSD haszn\u00e1lt\u00e1k. Az RHEL \u00e9s a sz\u00e1rmaz\u00e9kos disztrib\u00faci\u00f3k nem \u00e9rintettek a probl\u00e9m\u00e1ban, mivel az Exim nem r\u00e9sze a hivatalos csomagok t\u00e1rol\u00f3j\u00e1nak (az EPEL-ben az exim csomag friss\u00edt\u00e9se m\u00e9g nem jelent meg). <\/p>\n

Tov\u00e1bb\u00e1, \u00faj kihaszn\u00e1l\u00e1si vektor felfedez\u00e9se is megfigyelhet\u0151 a CVE-2025-26794 s\u00e9r\u00fcl\u00e9kenys\u00e9ghez, amelyet az Exim 4.98.1 febru\u00e1ri verzi\u00f3j\u00e1ban jav\u00edtottak. Ez a s\u00e9r\u00fcl\u00e9kenys\u00e9g lehet\u0151v\u00e9 teszi SQL-k\u00f3d injekci\u00f3j\u00e1t a bels\u0151 adatb\u00e1zisba (Hints DB). Az el\u0151z\u0151leg hozz\u00e1adott jav\u00edt\u00e1s nem escape\u2019-elte az egyes id\u00e9z\u0151jeleket. P\u00e9lda egy MAIL FROM parancsra, amely SQL-k\u00f3d injekci\u00f3t eredm\u00e9nyez: 'MAIL FROM:<x\u2019\/**\/UNION\/**\/SELECT\/**\/X'\u2019\u2014'@attacker.com>'. Ez a s\u00e9r\u00fcl\u00e9kenys\u00e9g felhaszn\u00e1lhat\u00f3 a fent eml\u00edtett puffert\u00falcsordul\u00e1s okoz\u00e1s\u00e1nak kezdeti l\u00e9p\u00e9sek\u00e9nt.
\n
Forr\u00e1s: 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. \u041f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435, \u043d\u043e \u0440\u0430\u0431\u043e\u0447\u0438\u0439 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u043f\u043e\u043a\u0430 \u043d\u0435 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u043a\u043e\u0434\u0435 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0439 \u0411\u0414 (Hints DB) \u043d\u0430 \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\udd47Az Exim 4.99.1 levelez\u0151szerver friss\u00edt\u00e9se a sebezhet\u0151s\u00e9g jav\u00edt\u00e1s\u00e1val | ProHoster","description":"Megjelent az Exim 4.99.1 levelez\u0151szerver jav\u00edt\u00f3 kiad\u00e1sa, amelyben jav\u00edtott\u00e1k a (CVE-2025-67896) sebezhet\u0151s\u00e9get, amely lehet\u0151v\u00e9 tette, hogy t\u00e1voli t\u00e1mad\u00f3 megs\u00e9rtheti a mem\u00f3ria tartalm\u00e1t a lefoglalt puffer ter\u00fclet\u00e9n k\u00edv\u00fcl.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/obnovlenie-pochtovogo-servera-exim-4-99-1-s-ustraneniem-uyazvimosti","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Exim 4.99.1 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 | ProHoster","og:description":"\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.","og:url":"https:\/\/prohoster.info\/hu\/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 15:12:54","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2026-01-20 15:12:54","updated":"2026-01-20 15:12:54","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/151908","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=151908"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/151908\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=151908"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=151908"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=151908"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}