{"id":172666,"date":"2026-05-19T00:24:49","date_gmt":"2026-05-18T22:24:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-exim-4-99-3-ustranena-uyazvimost-pozvolyayushhaya-udalyonnoe-vypolnenie-koda-pri-ispolzovanii-gnutls"},"modified":"2026-05-19T00:24:49","modified_gmt":"2026-05-18T22:24:49","slug":"v-exim-4-99-3-ustranena-uyazvimost-pozvolyayushhaya-udalyonnoe-vypolnenie-koda-pri-ispolzovanii-gnutls","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/v-exim-4-99-3-ustranena-uyazvimost-pozvolyayushhaya-udalyonnoe-vypolnenie-koda-pri-ispolzovanii-gnutls","title":{"rendered":"Az Exim 4.99.3-ban jav\u00edt\u00e1sra ker\u00fclt egy olyan sebezhet\u0151s\u00e9g, amely lehet\u0151v\u00e9 tette a t\u00e1voli k\u00f3d v\u00e9grehajt\u00e1s\u00e1t a GnuTLS haszn\u00e1lat\u00e1val.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Az Exim levelez\u0151szerver fejleszt\u0151i kiadt\u00e1k a jav\u00edt\u00f3 verzi\u00f3t Exim 4.99.3<\/strong>, amely megsz\u00fcnteti a sebezhet\u0151s\u00e9get bizonyos levelez\u0151\u00fcgyn\u00f6k konfigur\u00e1ci\u00f3kban. A probl\u00e9ma bels\u0151 azonos\u00edt\u00f3ja EXIM-Security-2026-05-01.1<\/strong>; a hivatalos \u00e9rtes\u00edt\u00e9sben is szerepel mint CVE-TBD<\/strong>.<\/p>\n

A sebezhet\u0151s\u00e9g a k\u00f6vetkez\u0151 oszt\u00e1lyhoz tartozik Remote Use-After-Free<\/strong> \u00e9s a lev\u00e9l t\u00f6rzs elemz\u00e9se sor\u00e1n jelentkezik BDAT<\/strong> TLS haszn\u00e1latakor a jav\u00edtatlan.<\/strong>. A BDAT az SMTP-kiterjeszt\u00e9sben haszn\u00e1latos CHUNKING<\/strong> a lev\u00e9l test\u00e9nek blokkokban val\u00f3 \u00e1tvitel\u00e9re. Az Exim le\u00edr\u00e1sa szerint a hiba akkor l\u00e9phet fel, amikor a kliens a BDAT \u00e1tvitel\u00e9nek sor\u00e1n TLS close_notify \u00e9rtes\u00edt\u00e9st k\u00fcld a test \u00e1tvitel\u00e9nek befejez\u00e9se el\u0151tt, \u00e9s ezt k\u00f6vet\u0151en egy tov\u00e1bbi b\u00e1jtot ad hozz\u00e1 ugyanazon TCP-kapcsolaton bel\u00fcl.<\/p>\n

Ebben a sorrendben az Exim a m\u00e1r felszabad\u00edtott mem\u00f3riabufferbe \u00edrhat adatokat a TLS-munkamenet befejez\u00e9se ut\u00e1n. Ez veremk\u00e1rosod\u00e1st eredm\u00e9nyez, \u00e9s potenci\u00e1lisan felhaszn\u00e1lhat\u00f3 k\u00f3d v\u00e9grehajt\u00e1s\u00e1ra. Az \u00e9rtes\u00edt\u00e9s hangs\u00falyozza, hogy a t\u00e1mad\u00f3nak elegend\u0151 a TLS-kapcsolat l\u00e9trehoz\u00e1sa \u00e9s az SMTP-kiterjeszt\u00e9s haszn\u00e1lata CHUNKING \/ BDAT<\/strong>.<\/p>\n

A probl\u00e9ma \u00e9rinti Exim 4.97, 4.98, 4.99, 4.99.1 \u00e9s 4.99.2<\/strong>, de csak azok a verzi\u00f3k, amelyek t\u00e1mogatj\u00e1k jav\u00edtatlan.<\/strong>. A hivatalos dokument\u00e1ci\u00f3ban ez \u00fagy van megfogalmazva, mint USE_GNUTLS=yes-vel rendelkez\u0151 konfigur\u00e1ci\u00f3k; a OpenSSL<\/strong> vagy m\u00e1s TLS k\u00f6nyvt\u00e1rakat haszn\u00e1l\u00f3 verzi\u00f3k nem \u00e9rintettek ezzel a sebezhet\u0151s\u00e9ggel. Az Exim \u00e9rtes\u00edt\u00e9se arra is k\u00fcl\u00f6n kit\u00e9r, hogy sebezhet\u0151ek azok a konfigur\u00e1ci\u00f3k, ahol a STARTTLS<\/strong> \u00e9s CHUNKING<\/strong>.<\/p>\n

jav\u00edt\u00e1s benne van a Exim 4.99.3<\/strong>. A fejleszt\u0151k le\u00edr\u00e1sa szerint a patch garant\u00e1lja a bemeneti feldolgoz\u00e1s verem\u00e9nek tiszta resetel\u00e9s\u00e9t a TLS close_notify \u00e9rtes\u00edt\u00e9s fogad\u00e1sa sor\u00e1n akt\u00edv BDAT \u00e1tvitel alatt, ami megakad\u00e1lyozza az elavult mutat\u00f3k tov\u00e1bbi haszn\u00e1lat\u00e1t. Alternat\u00edv megold\u00e1s a probl\u00e9ma teljes megsz\u00fcntet\u00e9s\u00e9re, kiv\u00e9ve a friss\u00edt\u00e9st, a javaslatokban nem szerepel.<\/p>\n

Az Exim fejleszt\u0151i \u00e9rtes\u00edt\u00e9st kaptak a hib\u00e1r\u00f3l 2026. m\u00e1jus 1-j\u00e9n<\/strong> Federico Kirschbaum-t\u00f3l az XBOW Security-t\u0151l.<\/strong>. A hiba jelent\u00e9se ut\u00e1n a jav\u00edt\u00e1s z\u00e1rt t\u00e1rol\u00f3kban k\u00e9sz\u00fclt, m\u00e1jus 7-\u00e9n a probl\u00e9m\u00e1r\u00f3l \u00e9rtes\u00edtett\u00e9k a disztrib\u00faci\u00f3kat z\u00e1rt levelez\u00e9si list\u00e1n, m\u00e1jus 10-\u00e9n korl\u00e1tozott hozz\u00e1f\u00e9r\u00e9st adtak a jav\u00edt\u00e1sokhoz, \u00e9s 2026. m\u00e1jus 12-\u00e9n<\/strong> tett\u00e9k k\u00f6zz\u00e9 a javaslatokat \u00e9s a jav\u00edt\u00f3 verzi\u00f3t.<\/p>\n

A levelez\u0151szerver adminisztr\u00e1torainak aj\u00e1nlott ellen\u0151rizni az Exim \u00e9s a TLS backend verzi\u00f3t. szerver<\/a> az Exim 4.97 \u00e9s 4.99.2 k\u00f6z\u00f6tt m\u0171k\u00f6dik, GnuTLS-sel k\u00e9sz\u00fclt, \u00e9s a STARTTLS-t a CHUNKING-gal egy\u00fctt hirdeti. Az Exim projekt azt javasolja, hogy min\u00e9l hamarabb friss\u00edtsenek a Exim 4.99.3<\/strong> vagy \u00fajabb verzi\u00f3ra. A jav\u00edtott forr\u00e1sk\u00f3dok el\u00e9rhet\u0151k az exim-4.99+fixes \u00e1gon \u00e9s az exim-4.99.3 c\u00edmk\u00e9n, valamint tarball-arch\u00edvum form\u00e1j\u00e1ban a szok\u00e1sos Exim let\u00f6lt\u00e9si helyeken.<\/p>\n

Forr\u00e1s: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Exim \u0432\u044b\u043f\u0443\u0441\u0442\u0438\u043b\u0438 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0440\u0435\u043b\u0438\u0437 Exim 4.99.3, \u0443\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0449\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044f\u0445 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0430\u0433\u0435\u043d\u0442\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u0445\u043e\u0434\u0438\u0442 \u043f\u043e\u0434 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u043c \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u043c EXIM-Security-2026-05-01.1; \u0432 \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u043c \u0443\u0432\u0435\u0434\u043e\u043c\u043b\u0435\u043d\u0438\u0438 \u0442\u0430\u043a\u0436\u0435 \u0444\u0438\u0433\u0443\u0440\u0438\u0440\u0443\u0435\u0442 \u043a\u0430\u043a CVE-TBD. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a \u043a\u043b\u0430\u0441\u0441\u0443 Remote Use-After-Free \u0438 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0442\u0435\u043b\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f BDAT \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 TLS \u0447\u0435\u0440\u0435\u0437 GnuTLS. BDAT \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 SMTP-\u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u0438 CHUNKING \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0442\u0435\u043b\u0430 […]<\/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-172666","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 4.99.3-ban megsz\u00fcntett\u00e9k a GnuTLS haszn\u00e1lata mellett megval\u00f3sul\u00f3 t\u00e1voli k\u00f3dfuttat\u00e1s sebezhet\u0151s\u00e9get | ProHoster","description":"Az Exim levelez\u0151szerver fejleszt\u0151i kiadt\u00e1k az Exim 4.99.3 jav\u00edt\u00f3 verzi\u00f3j\u00e1t, amely hib\u00e1t k\u00fcsz\u00f6b\u00f6l ki bizonyos levelez\u0151 \u00fcgyn\u00f6k konfigur\u00e1ci\u00f3kban.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/v-exim-4-99-3-ustranena-uyazvimost-pozvolyayushhaya-udalyonnoe-vypolnenie-koda-pri-ispolzovanii-gnutls","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\u0412 Exim 4.99.3 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 GnuTLS | ProHoster","og:description":"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Exim \u0432\u044b\u043f\u0443\u0441\u0442\u0438\u043b\u0438 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0440\u0435\u043b\u0438\u0437 Exim 4.99.3, \u0443\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0449\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044f\u0445 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0430\u0433\u0435\u043d\u0442\u0430.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/v-exim-4-99-3-ustranena-uyazvimost-pozvolyayushhaya-udalyonnoe-vypolnenie-koda-pri-ispolzovanii-gnutls","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":"2026-05-18T22:24:49+00:00","article:modified_time":"2026-05-18T22:24:49+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\/hu\/wp-json\/wp\/v2\/posts\/172666","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\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=172666"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/172666\/revisions"}],"predecessor-version":[{"id":173168,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/172666\/revisions\/173168"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=172666"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=172666"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=172666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}