{"id":105318,"date":"2022-10-17T21:36:42","date_gmt":"2022-10-17T19:36:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg"},"modified":"2022-10-17T21:36:42","modified_gmt":"2022-10-17T19:36:42","slug":"uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","title":{"rendered":"Vuln\u00e9rabilit\u00e9 dans LibKSBA entra\u00eenant l'ex\u00e9cution de code lors du traitement S\/MIME dans GnuPG","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Une vuln\u00e9rabilit\u00e9 critique (CVE-2022-3515) a \u00e9t\u00e9 identifi\u00e9e dans la biblioth\u00e8que LibKSBA, d\u00e9velopp\u00e9e par le projet GnuPG et fournissant des fonctions pour travailler avec des certificats X.509. Cette vuln\u00e9rabilit\u00e9 entra\u00eene un d\u00e9passement d'entier et une \u00e9criture de donn\u00e9es arbitraires au-del\u00e0 du tampon allou\u00e9 lors de l'analyse des structures ASN.1 utilis\u00e9es dans S\/MIME, X.509 et CMS. Le probl\u00e8me est aggrav\u00e9 par le fait que la biblioth\u00e8que Libksba est utilis\u00e9e dans le package GnuPG, et cette vuln\u00e9rabilit\u00e9 peut permettre l'ex\u00e9cution de code \u00e0 distance par un attaquant lors du traitement dans GnuPG (gpgsm) de donn\u00e9es chiffr\u00e9es ou sign\u00e9es provenant de fichiers ou de messages \u00e9lectroniques utilisant S\/MIME. Dans le cas le plus simple pour attaquer une victime utilisant un client de messagerie supportant GnuPG et S\/MIME, il suffit d'envoyer un e-mail sp\u00e9cialement con\u00e7u. <\/p>\n

La vuln\u00e9rabilit\u00e9 peut \u00e9galement \u00eatre exploit\u00e9e pour attaquer les serveurs dirmngr qui s'occupent du t\u00e9l\u00e9chargement et de l'analyse des listes de certificats r\u00e9voqu\u00e9s (CRL) et de la v\u00e9rification des certificats utilis\u00e9s dans TLS. Une attaque sur dirmngr peut \u00eatre effectu\u00e9e depuis serveur web<\/a>, sous le contr\u00f4le de l'attaquant, en soumettant des CRL ou certificats sp\u00e9cialement format\u00e9s. \u00c0 l'heure actuelle, il n'existe pas d'exploits publics connus pour gpgsm et dirmngr, mais la vuln\u00e9rabilit\u00e9 est typique et rien n'emp\u00eache des attaquants qualifi\u00e9s de cr\u00e9er un exploit eux-m\u00eames. <\/p>\n

La vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 corrig\u00e9e dans la version 1.6.2 de Libksba et dans les versions binaires de GnuPG 2.3.8. Dans les distributions Linux, la biblioth\u00e8que Libksba est g\u00e9n\u00e9ralement fournie en tant que d\u00e9pendance distincte, tandis que dans les versions Windows, elle est int\u00e9gr\u00e9e dans le paquet d'installation principal de GnuPG. Apr\u00e8s la mise \u00e0 jour, n'oubliez pas de red\u00e9marrer les processus en arri\u00e8re-plan avec la commande \u00ab gpgconf \u2014kill all \u00bb. Pour v\u00e9rifier la pr\u00e9sence du probl\u00e8me, vous pouvez \u00e9valuer la valeur de la ligne \u00ab KSBA \u2026 \u00bb dans la sortie de la commande \u00ab gpgconf \u2014show-versions \u00bb, o\u00f9 la version doit \u00eatre au moins 1.6.2. <\/p>\n

Les mises \u00e0 jour pour les distributions n'ont pas encore \u00e9t\u00e9 publi\u00e9es, mais vous pouvez suivre leur apparition sur les pages : Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD. La vuln\u00e9rabilit\u00e9 est \u00e9galement pr\u00e9sente dans les packages MSI et AppImage avec GnuPG VS-Desktop et dans Gpg4win.
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 LibKSBA, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c GnuPG \u0438 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u0430\u043c\u0438 X.509, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-3515), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u043c\u0443 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0438 \u0437\u0430\u043f\u0438\u0441\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440 ASN.1, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0432 S\/MIME, X.509 \u0438 CMS. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0443\u0433\u0443\u0431\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043c, \u0447\u0442\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 Libksba \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 \u043f\u0430\u043a\u0435\u0442\u0435 GnuPG \u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a […]<\/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-105318","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\udd47Vuln\u00e9rabilit\u00e9 dans LibKSBA, conduisant \u00e0 l'ex\u00e9cution de code lors du traitement S\/MIME dans GnuPG | ProHoster","description":"Une vuln\u00e9rabilit\u00e9 critique (CVE-2022-3515) a \u00e9t\u00e9 identifi\u00e9e dans la biblioth\u00e8que LibKSBA, d\u00e9velopp\u00e9e par le projet GnuPG et fournissant des fonctions pour travailler avec des certificats X.509, entra\u00eenant un d\u00e9passement 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