{"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\/ro\/blog\/news\/v-exim-4-99-3-ustranena-uyazvimost-pozvolyayushhaya-udalyonnoe-vypolnenie-koda-pri-ispolzovanii-gnutls","title":{"rendered":"\u00cen Exim 4.99.3 a fost remediat\u0103 o vulnerabilitate care permite execu\u021bia de cod de la distan\u021b\u0103 atunci c\u00e2nd se utilizeaz\u0103 GnuTLS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dezvoltatorii serverului de email Exim au lansat o versiune corectiv\u0103 Exim 4.99.3<\/strong>, care remediaz\u0103 o vulnerabilitate \u00een anumite configura\u021bii ale agentului po\u0219tal. Problema este identificat\u0103 cu num\u0103rul intern EXIM-Security-2026-05-01.1<\/strong>; \u00een notificarea oficial\u0103 este men\u021bionat\u0103 \u0219i ca CVE-TBD<\/strong>.<\/p>\n

Vulnerabilitatea apar\u021bine categoriei Remote Use-After-Free<\/strong> \u0219i se manifest\u0103 \u00een timpul analizei corpului mesajului BDAT<\/strong> \u00een timpul func\u021bion\u0103rii TLS prin GnuTLS<\/strong>. BDAT este utilizat \u00een extensia SMTP CHUNKING<\/strong> pentru transmiterea corpului email-ului \u00een blocuri. Conform descrierii Exim, eroarea poate fi cauzat\u0103 atunci c\u00e2nd clientul, \u00een timpul transferului BDAT, trimite notificarea TLS close_notify \u00eenainte de finalizarea transferului corpului, apoi adaug\u0103 un byte suplimentar \u00een cadrul acelea\u0219i conexiuni TCP.<\/p>\n

\u00centr-o astfel de secven\u021b\u0103, Exim poate scrie date \u00een un buffer de memorie care a fost deja eliberat la \u00eencheierea sesiunii TLS. Acest lucru duce la coruperea heap-ului \u0219i poate fi folosit pentru execu\u021bia de cod. \u00cen notificare se subliniaz\u0103 c\u0103 atacatorul trebuie doar s\u0103 aib\u0103 capacitatea de a stabili o conexiune TLS \u0219i de a utiliza extensia SMTP CHUNKING \/ BDAT<\/strong>.<\/p>\n

Problema afecteaz\u0103 Exim 4.97, 4.98, 4.99, 4.99.1 \u0219i 4.99.2<\/strong>, dar doar construc\u021bii realizate cu suport GnuTLS<\/strong>. \u00cen documenta\u021bia oficial\u0103, aceasta este formulat\u0103 ca fiind configura\u021bii cu USE_GNUTLS=yes; construc\u021biile care folosesc OpenSSL<\/strong> sau alte biblioteci TLS nu sunt afectate de aceast\u0103 vulnerabilitate. De asemenea, notificarea Exim specific\u0103 \u00een mod explicit c\u0103 sunt vulnerabile configura\u021biile \u00een care se declar\u0103 STARTTLS<\/strong> \u0219i CHUNKING<\/strong>.<\/p>\n

Corectarea este inclus\u0103 \u00een Exim 4.99.3<\/strong>. Conform descrierii dezvoltatorilor, patch-ul garanteaz\u0103 o resetare curat\u0103 a stivii de procesare a intr\u0103rii la primirea TLS close_notify \u00een timpul transferului activ BDAT, prevenind utilizarea ulterioar\u0103 a pointerilor dep\u0103\u0219i\u021bi. Nu exist\u0103 alte metode cunoscute de a rezolva complet problema, \u00een afar\u0103 de actualizare.<\/p>\n

Dezvoltatorii Exim au primit un raport de eroare pe 1 mai 2026<\/strong> de la Federico Kirschbaum de la XBOW Security<\/strong>. Dup\u0103 examinarea raportului, corectarea a fost preg\u0103tit\u0103 \u00een repozitorii private, pe 7 mai problema a fost comunicat\u0103 distribu\u021biilor printr-o list\u0103 de coresponden\u021b\u0103 privat\u0103, pe 10 mai li s-a oferit acces limitat la corecturi, iar pe 12 mai 2026<\/strong> au fost publicate recomand\u0103rile \u0219i versiunea corectiv\u0103.<\/p>\n

Administratorii serverelor de po\u0219t\u0103 sunt ruga\u021bi s\u0103 verifice versiunea utilizat\u0103 de Exim \u0219i backend-ul TLS al compil\u0103rii. Dac\u0103 serverul<\/a> func\u021bioneaz\u0103 cu Exim de la 4.97 la 4.99.2 inclusiv, compilat cu GnuTLS \u0219i anun\u021b\u0103 STARTTLS \u00eempreun\u0103 cu CHUNKING, proiectul Exim recomand\u0103 trecerea la Exim 4.99.3<\/strong> o versiune mai nou\u0103 c\u00e2t mai cur\u00e2nd posibil. Codurile surs\u0103 corectate sunt disponibile \u00een ramura exim-4.99+fixes \u0219i eticheta exim-4.99.3, precum \u0219i sub form\u0103 de arhive tarball pe platformele obi\u0219nuite de desc\u0103rcare Exim.<\/p>\n

Sursa: 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\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\u00cen Exim 4.99.3 a fost rezolvat\u0103 o vulnerabilitate care permite executarea de cod de la distan\u021b\u0103 atunci c\u00e2nd se folose\u0219te GnuTLS | ProHoster","description":"Dezvoltatorii serverului de po\u0219t\u0103 Exim au lansat o versiune corectiv\u0103 Exim 4.99.3, care rezolv\u0103 o vulnerabilitate \u00een anumite configura\u021bii ale agentului de po\u0219t\u0103.","canonical_url":"https:\/\/prohoster.info\/ro\/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":"ro_RO","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\/ro\/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\/ro\/wp-json\/wp\/v2\/posts\/172666","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/comments?post=172666"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/posts\/172666\/revisions"}],"predecessor-version":[{"id":173168,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/posts\/172666\/revisions\/173168"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/media?parent=172666"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/categories?post=172666"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/tags?post=172666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}