{"id":93183,"date":"2020-09-04T07:42:02","date_gmt":"2020-09-04T05:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux"},"modified":"2020-09-04T07:42:02","modified_gmt":"2020-09-04T05:42:02","slug":"uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","title":{"rendered":"Vuln\u00e9rabilit\u00e9 dans l'impl\u00e9mentation des sockets AF_PACKET du noyau Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Trois ans apr\u00e8s la vague de vuln\u00e9rabilit\u00e9s (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>, 5<\/a><\/noindex>) dans la sous-syst\u00e8me AF_PACKET du noyau Linux une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 identifi\u00e9e<\/a><\/noindex> , un nouveau probl\u00e8me (CVE-2020-14386<\/a><\/noindex>), permettant \u00e0 un utilisateur local non privil\u00e9gi\u00e9 d\u2019ex\u00e9cuter du code avec des privil\u00e8ges root ou de sortir des conteneurs isol\u00e9s, en ayant acc\u00e8s \u00e0 ceux-ci en tant que root.<\/p>\n

Pour cr\u00e9er un socket AF_PACKET et exploiter la vuln\u00e9rabilit\u00e9, des privil\u00e8ges CAP_NET_RAW sont n\u00e9cessaires. Cependant, ce privil\u00e8ge peut \u00eatre obtenu par un utilisateur non privil\u00e9gi\u00e9 dans des conteneurs cr\u00e9\u00e9s dans des syst\u00e8mes avec la prise en charge des espaces de noms utilisateur activ\u00e9e. Par exemple, les espaces de noms utilisateur sont activ\u00e9s par d\u00e9faut dans Ubuntu et Fedora, mais ne le sont pas dans Debian et RHEL. Sur Android, le processus mediaserver a le droit de cr\u00e9er des sockets AF_PACKET, permettant ainsi l'exploitation de la vuln\u00e9rabilit\u00e9.<\/p>\n

Une vuln\u00e9rabilit\u00e9 est pr\u00e9sente dans la fonction tpacket_rcv, caus\u00e9e par une erreur de calcul de la variable netoff. Un attaquant peut cr\u00e9er des conditions dans lesquelles la valeur de netoff sera inf\u00e9rieure \u00e0 celle de maclen, ce qui entra\u00eenera un d\u00e9passement lors du calcul de \u00ab macoff = netoff - maclen \u00bb et une mauvaise installation ult\u00e9rieure du pointeur vers le tampon pour les donn\u00e9es entrantes. En fin de compte, un attaquant peut initier une \u00e9criture de 1 \u00e0 10 octets dans une zone en dehors du tampon allou\u00e9. Il est not\u00e9 qu'un exploit permettant d'obtenir des droits root dans le syst\u00e8me est en cours de d\u00e9veloppement. <\/p>\n

Le probl\u00e8me est pr\u00e9sent dans le noyau depuis juillet 2008, c'est-\u00e0-dire qu'il se manifeste dans tous les noyaux actuels. Un correctif est pour l'instant disponible sous forme de d'un correctif<\/a><\/noindex>. On peut suivre l'apparition des mises \u00e0 jour de paquets dans les distributions sur les pages suivantes : Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/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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[…]<\/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-93183","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 l\u2019impl\u00e9mentation des sockets AF_PACKET du noyau Linux | ProHoster","description":"Trois ans apr\u00e8s la vague de vuln\u00e9rabilit\u00e9s 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