{"id":37426,"date":"2019-10-31T22:17:33","date_gmt":"2019-10-31T19:17:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-pozvolyayushhaya-vyjti-iz-izolirovannogo-okruzheniya-qemu\/"},"modified":"2019-10-31T22:17:33","modified_gmt":"2019-10-31T19:17:33","slug":"uyazvimost-pozvolyayushhaya-vyjti-iz-izolirovannogo-okruzheniya-qemu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-pozvolyayushhaya-vyjti-iz-izolirovannogo-okruzheniya-qemu","title":{"rendered":"Vuln\u00e9rabilit\u00e9 permettant de sortir d'un environnement isol\u00e9 QEMU","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

D\u00e9voil\u00e9<\/a><\/noindex> d\u00e9tails d'une vuln\u00e9rabilit\u00e9 critique (CVE-2019-14378<\/a><\/noindex>) dans le gestionnaire SLIRP, utilis\u00e9 par d\u00e9faut dans QEMU pour \u00e9tablir un canal de communication entre un adaptateur r\u00e9seau virtuel dans le syst\u00e8me invit\u00e9 et le backend r\u00e9seau du c\u00f4t\u00e9 de QEMU. Le probl\u00e8me affecte \u00e9galement les syst\u00e8mes de virtualisation bas\u00e9s sur KVM (en mode Usermode<\/a><\/noindex>) et Virtualbox, qui utilisent le backend slirp de QEMU, ainsi que les applications appliquant la pile r\u00e9seau dans l'espace utilisateur libSLIRP<\/a><\/noindex> (\u00e9mulateur TCP\/IP).<\/p>\n

La vuln\u00e9rabilit\u00e9 permet l'ex\u00e9cution de code du c\u00f4t\u00e9 de l'h\u00f4te avec les privil\u00e8ges du processus gestionnaire QEMU lorsqu'un paquet r\u00e9seau sp\u00e9cialement form\u00e9 et tr\u00e8s volumineux est envoy\u00e9 depuis le syst\u00e8me invit\u00e9, n\u00e9cessitant une fragmentation. En raison d'une erreur dans la fonction ip_reass(), appel\u00e9e lors de la reconstruction des paquets entrants, le premier fragment peut ne pas tenir dans le tampon allou\u00e9 et son extr\u00e9mit\u00e9 sera \u00e9crite dans les zones m\u00e9moire suivantes au tampon. <\/p>\n

Pour tester d\u00e9j\u00e0 disponible<\/a><\/noindex> un prototype fonctionnel de l'exploit, qui pr\u00e9voit un contournement de l'ASLR et une ex\u00e9cution de code via un \u00e9crasement de la m\u00e9moire de l'array main_loop_tlg, incluant la liste QEMUTimerList avec des gestionnaires appel\u00e9s par le minuteur.
\nLa vuln\u00e9rabilit\u00e9 a d\u00e9j\u00e0 \u00e9t\u00e9 corrig\u00e9e dans Fedora<\/a><\/noindex> et SUSE\/openSUSE<\/a><\/noindex>, mais reste non corrig\u00e9e dans Debian<\/a><\/noindex>, Arch Linux<\/a><\/noindex> et FreeBSD<\/a><\/noindex>. Il y a Ubuntu<\/a><\/noindex> et RHEL<\/a><\/noindex> le probl\u00e8me ne se manifeste pas en raison de l'absence d'utilisation de slirp. La vuln\u00e9rabilit\u00e9 reste non corrig\u00e9e dans la derni\u00e8re version libslirp 4.0<\/a><\/noindex> (la correction est pour l'instant disponible sous forme de d'un correctif<\/a><\/noindex>).<\/p>\n

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

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

\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0434\u0435\u0442\u0430\u043b\u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2019-14378) \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 SLIRP, \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0432 QEMU \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u0430\u043d\u0430\u043b\u0430 \u0441\u0432\u044f\u0437\u0438 \u043c\u0435\u0436\u0434\u0443 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u043c \u0441\u0435\u0442\u0435\u0432\u044b\u043c \u0430\u0434\u0430\u043f\u0442\u0435\u0440\u043e\u043c \u0432 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438 \u0441\u0435\u0442\u0435\u0432\u044b\u043c \u0431\u044d\u043a\u0435\u043d\u0434\u043e\u043c \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 QEMU. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0442\u0430\u043a\u0436\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043d\u0430 \u0431\u0430\u0437\u0435 KVM (\u0432 \u0440\u0435\u0436\u0438\u043c\u0435 Usermode) \u0438 Virtualbox, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0431\u044d\u043a\u0435\u043d\u0434 slirp \u0438\u0437 QEMU, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0449\u0438\u0435 \u0441\u0435\u0442\u0435\u0432\u043e\u0439 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