{"id":37658,"date":"2019-10-31T22:18:53","date_gmt":"2019-10-31T19:18:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kriticheskaya-uyazvimost-v-imap-servere-dovecot\/"},"modified":"2019-10-31T22:18:53","modified_gmt":"2019-10-31T19:18:53","slug":"kriticheskaya-uyazvimost-v-imap-servere-dovecot","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/kriticheskaya-uyazvimost-v-imap-servere-dovecot","title":{"rendered":"Vuln\u00e9rabilit\u00e9 critique dans le serveur IMAP Dovecot","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dans des versions correctives<\/a><\/noindex> serveurs POP3\/IMAP4 Dovecot<\/a><\/noindex> 2.3.7.2 et 2.2.36.4, ainsi que dans le suppl\u00e9ment Pigeonhole 0.5.7.2 et 0.4.24.2 <\/a><\/noindex>, corrig\u00e9e vuln\u00e9rabilit\u00e9 critique<\/a><\/noindex> (CVE-2019-11500<\/a><\/noindex>), qui permet d'\u00e9crire des donn\u00e9es au-del\u00e0 du tampon allou\u00e9 en envoyant une requ\u00eate sp\u00e9cialement format\u00e9e via les protocoles IMAP ou ManageSieve. <\/p>\n

Le probl\u00e8me peut \u00eatre exploit\u00e9 \u00e0 l'\u00e9tape pr\u00e9c\u00e9dant l'authentification. Aucun exploit fonctionnel n'est encore pr\u00e9par\u00e9, mais les d\u00e9veloppeurs de Dovecot ne rejettent pas la possibilit\u00e9 d'utiliser cette vuln\u00e9rabilit\u00e9 pour organiser des attaques de code \u00e0 distance ou pour provoquer des fuites de donn\u00e9es confidentielles. Tous les utilisateurs sont fortement conseill\u00e9s de mettre \u00e0 jour imm\u00e9diatement leurs syst\u00e8mes (Debian<\/a><\/noindex>, Fedora<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>, RHEL<\/a><\/noindex>, FreeBSD<\/a><\/noindex>).<\/p>\n

La vuln\u00e9rabilit\u00e9 se trouve dans les parseurs des protocoles IMAP et ManageSieve et est caus\u00e9e par un traitement incorrect des caract\u00e8res nuls lors de l'analyse des donn\u00e9es dans les cha\u00eenes entre guillemets. Le probl\u00e8me permet d'\u00e9crire des donn\u00e9es arbitraires dans les objets stock\u00e9s au-del\u00e0 du tampon allou\u00e9 (avant authentification, il est possible d'\u00e9craser jusqu'\u00e0 8 Ko, et apr\u00e8s authentification jusqu'\u00e0 64 Ko). <\/p>\n

Selon des passionn\u00e9s de ce sujet, pour se d\u00e9tourner de toutes les complexit\u00e9s vers un espace de noms universel, durable et d\u00e9centralis\u00e9, il faudra :<\/a><\/noindex> l'utilisation par les ing\u00e9nieurs de la soci\u00e9t\u00e9 Red Hat des probl\u00e8mes pour des attaques r\u00e9elles est compliqu\u00e9e par le fait que l'attaquant ne peut pas contr\u00f4ler la position de l'\u00e9criture arbitraire des donn\u00e9es dans la m\u00e9moire. En r\u00e9ponse, il est avanc\u00e9 que cette caract\u00e9ristique rend simplement l'attaque beaucoup plus difficile, mais ne l'exclut pas totalement\u2014l'attaquant peut r\u00e9p\u00e9ter plusieurs fois la tentative d'exploitation jusqu'\u00e0 ce qu'il atteigne la zone utilisable dans la m\u00e9moire.<\/p>\n

<\/a><\/noindex><\/p>\n

Source : opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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