{"id":73151,"date":"2020-03-07T14:42:03","date_gmt":"2020-03-07T11:42:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root"},"modified":"2020-03-07T14:42:03","modified_gmt":"2020-03-07T11:42:03","slug":"uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","title":{"rendered":"Vuln\u00e9rabilit\u00e9 dans pppd et lwIP permettant d'ex\u00e9cuter du code \u00e0 distance avec des droits root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dans le paquet pppd une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 identifi\u00e9e<\/a><\/noindex> CVE-2020-10174<\/a><\/noindex> (CVE-2020-8597<\/a><\/noindex>), permettant d'ex\u00e9cuter son propre code en envoyant des requ\u00eates d'authentification sp\u00e9cialement format\u00e9es aux syst\u00e8mes utilisant le protocole PPP (Point-to-Point Protocol) ou PPPoE (PPP over Ethernet). Ces protocoles sont g\u00e9n\u00e9ralement utilis\u00e9s par les fournisseurs pour \u00e9tablir des connexions via Ethernet ou DSL, et sont \u00e9galement utilis\u00e9s dans certains VPN (par exemple, pptpd et openfortivpn<\/a><\/noindex>). Pour v\u00e9rifier si vos syst\u00e8mes sont vuln\u00e9rables \u00e0 ce probl\u00e8me pr\u00e9par\u00e9<\/a><\/noindex> prototype d'exploit.<\/p>\n

La vuln\u00e9rabilit\u00e9 est caus\u00e9e par un d\u00e9bordement de tampon dans l'impl\u00e9mentation du protocole d'authentification EAP (Extensible Authentication Protocol). Une attaque peut \u00eatre r\u00e9alis\u00e9e avant l'authentification en envoyant un paquet de type EAPT_MD5CHAP, contenant un nom d'h\u00f4te tr\u00e8s long, ne tenant pas dans le tampon allou\u00e9. En raison d'une erreur dans le code de v\u00e9rification de la taille du champ rhostname, un attaquant peut \u00e9craser des donn\u00e9es en dehors du tampon dans la pile et obtenir l'ex\u00e9cution \u00e0 distance de son code avec les droits root. La vuln\u00e9rabilit\u00e9 se manifeste du c\u00f4t\u00e9 du serveur et du client, c'est-\u00e0-dire qu'il peut y avoir une attaque non seulement sur le serveur, mais aussi sur le client tentant de se connecter \u00e0 un serveur contr\u00f4l\u00e9 par l'attaquant (par exemple, l'attaquant peut d'abord compromettre le serveur via cette vuln\u00e9rabilit\u00e9, puis commencer \u00e0 cibler les clients qui se connectent).<\/p>\n

Le probl\u00e8me concerne les versions pppd<\/a><\/noindex> de 2.4.2 \u00e0 2.4.8 inclus et a \u00e9t\u00e9 corrig\u00e9 sous la forme d'un correctif<\/a><\/noindex>. La vuln\u00e9rabilit\u00e9 concerne \u00e9galement touche<\/a><\/noindex> la pile lwIP<\/a><\/noindex>, mais dans la configuration par d\u00e9faut de lwIP, le support de l'EAP n'est pas activ\u00e9.<\/p>\n

Le statut de correction du probl\u00e8me dans les distributions peut \u00eatre consult\u00e9 sur ces pages : Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, OpenWRT<\/a><\/noindex>, Arch<\/a><\/noindex>, NetBSD<\/a><\/noindex>. Dans RHEL, OpenWRT et SUSE, le paquet pppd est compil\u00e9 avec la protection \"Stack Smashing Protection\" (mode \"-fstack-protector\" dans gcc), ce qui limite l'exploitation des crashs. En plus des distributions, la vuln\u00e9rabilit\u00e9 a \u00e9galement \u00e9t\u00e9 confirm\u00e9e dans certains produits. Cisco<\/a><\/noindex> (CallManager), TP-LINK<\/a><\/noindex> et Synology (DiskStation Manager, VisualStation VS960HD et Router Manager), utilisant le code pppd ou lwIP.<\/p>\n

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

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

\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 pppd \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-8597), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043d\u0430 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u043c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b PPP (Point-to-Point Protocol) \u0438\u043b\u0438 PPPoE (PPP over Ethernet). \u0414\u0430\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b \u043e\u0431\u044b\u0447\u043d\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0432\u0430\u0439\u0434\u0435\u0440\u0430\u043c\u0438 \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0447\u0435\u0440\u0435\u0437 Ethernet \u0438\u043b\u0438 DSL, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 VPN (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, pptpd \u0438 openfortivpn). \u0414\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0441\u0432\u043e\u0438\u0445 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