{"id":105776,"date":"2022-12-01T15:37:11","date_gmt":"2022-12-01T13:37:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd"},"modified":"2022-12-01T15:37:11","modified_gmt":"2022-12-01T13:37:11","slug":"udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","title":{"rendered":"Vuln\u00e9rabilit\u00e9 root exploit\u00e9e \u00e0 distance dans l'outil ping fourni avec FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Une vuln\u00e9rabilit\u00e9 (CVE-2022-23093) a \u00e9t\u00e9 identifi\u00e9e dans l'outil ping inclus dans la distribution de base de FreeBSD. Ce probl\u00e8me peut potentiellement permettre l'ex\u00e9cution de code \u00e0 distance avec des droits root lors de l'utilisation de ping pour v\u00e9rifier un h\u00f4te externe contr\u00f4l\u00e9 par un attaquant. Un correctif a \u00e9t\u00e9 propos\u00e9 dans les mises \u00e0 jour FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 et 12.3-RELEASE-p10. Il reste \u00e0 voir si d'autres syst\u00e8mes BSD sont \u00e9galement vuln\u00e9rables (aucun rapport d'exploit n'a encore \u00e9t\u00e9 publi\u00e9 pour NetBSD, DragonFlyBSD et OpenBSD).      <\/p>\n<p>La vuln\u00e9rabilit\u00e9 est due \u00e0 un d\u00e9bordement de tampon dans le code d'analyse des messages ICMP re\u00e7us en r\u00e9ponse \u00e0 une requ\u00eate de v\u00e9rification. Le code d'envoi et de r\u00e9ception des messages ICMP dans ping utilise des sockets bruts et s'ex\u00e9cute avec des privil\u00e8ges accrus (l'outil est livr\u00e9 avec le drapeau setuid root). Le traitement de la r\u00e9ponse est effectu\u00e9 c\u00f4t\u00e9 ping par la reconstruction des en-t\u00eates IP et ICMP des paquets re\u00e7us \u00e0 partir du socket brut. Les en-t\u00eates IP et ICMP extraits sont copi\u00e9s par la fonction pr_pack() dans des tampons, sans tenir compte des en-t\u00eates suppl\u00e9mentaires pouvant exister apr\u00e8s l'en-t\u00eate IP du paquet.     <\/p>\n<p>De tels en-t\u00eates sont extraits du paquet et inclus dans le bloc d'en-t\u00eates, mais ne sont pas pris en compte lors du calcul de la taille du tampon. Si l'h\u00f4te r\u00e9pond \u00e0 la requ\u00eate ICMP envoy\u00e9e avec un paquet contenant des en-t\u00eates suppl\u00e9mentaires, leur contenu sera \u00e9crit hors des limites du tampon dans la pile. En cons\u00e9quence, l'attaquant peut \u00e9craser jusqu'\u00e0 40 octets de donn\u00e9es dans la pile, ce qui permet potentiellement d'ex\u00e9cuter son code. La gravit\u00e9 du probl\u00e8me est att\u00e9nu\u00e9e par le fait qu'au moment o\u00f9 l'erreur se manifeste, le processus est dans un \u00e9tat d'isolation des appels syst\u00e8mes (mode de capacit\u00e9), ce qui rend difficile l'acc\u00e8s au reste du syst\u00e8me apr\u00e8s l'exploitation de la vuln\u00e9rabilit\u00e9.<br \/>\n<br \/>Source : <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58232\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-23093) \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ping, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0431\u0430\u0437\u043e\u0432\u0443\u044e \u043f\u043e\u0441\u0442\u0430\u0432\u043a\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u043f\u0440\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 ping \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u0445\u043e\u0441\u0442\u0430, \u043f\u043e\u0434\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043e \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 \u0438 12.3-RELEASE-p10. \u041f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u043b\u0438 \u0434\u0440\u0443\u0433\u0438\u0435 BSD-\u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u043a\u0430 \u043d\u0435 \u044f\u0441\u043d\u043e (\u043e\u0442\u0447\u0451\u0442\u043e\u0432 \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 NetBSD, [&hellip;]<\/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-105776","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" 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