{"id":99965,"date":"2021-04-19T10:22:35","date_gmt":"2021-04-19T08:22:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti"},"modified":"2021-04-19T10:22:35","modified_gmt":"2021-04-19T08:22:35","slug":"reliz-openssh-8-6-s-ustraneniem-uyazvimosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/reliz-openssh-8-6-s-ustraneniem-uyazvimosti","title":{"rendered":"Sortie d'OpenSSH 8.6 avec correction de vuln\u00e9rabilit\u00e9","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>La version OpenSSH 8.6 a \u00e9t\u00e9 publi\u00e9e, une impl\u00e9mentation open-source du client et du serveur pour les protocoles SSH 2.0 et SFTP. La nouvelle version corrige une vuln\u00e9rabilit\u00e9 dans l'impl\u00e9mentation de la directive LogVerbose, apparue dans la derni\u00e8re version, qui permet d'augmenter le niveau des informations de d\u00e9bogage enregistr\u00e9es dans les logs, notamment en r\u00e9alisant des filtres par motifs, fonctions et fichiers associ\u00e9s au code ex\u00e9cut\u00e9 avec des privil\u00e8ges r\u00e9duits dans le processus sshd, isol\u00e9 dans un environnement sandbox.      <\/p>\n<p>Un attaquant ayant r\u00e9ussi \u00e0 prendre le contr\u00f4le d'un processus non privil\u00e9gi\u00e9 par le biais d'une vuln\u00e9rabilit\u00e9 encore inconnue peut exploiter le probl\u00e8me li\u00e9 \u00e0 LogVerbose pour contourner l'isolement du sandbox et mener une attaque sur un processus ex\u00e9cut\u00e9 avec des privil\u00e8ges \u00e9lev\u00e9s. L'exploitation de la vuln\u00e9rabilit\u00e9 LogVerbose est jug\u00e9e peu probable en pratique, car la configuration LogVerbose est d\u00e9sactiv\u00e9e par d\u00e9faut et est g\u00e9n\u00e9ralement utilis\u00e9e uniquement lors du d\u00e9bogage. De plus, une nouvelle vuln\u00e9rabilit\u00e9 doit \u00eatre trouv\u00e9e dans le processus non privil\u00e9gi\u00e9 pour r\u00e9aliser l'attaque.    <\/p>\n<p>Changements dans OpenSSH 8.6 non li\u00e9s \u00e0 la vuln\u00e9rabilit\u00e9 :  <\/p>\n<ul>\n<li class=\"l\"> Dans sftp et sftp-server, une nouvelle extension du protocole \u00ab limits@openssh.com \u00bb a \u00e9t\u00e9 mise en \u0153uvre, permettant au client SFTP d'obtenir des informations sur les r\u00e9glages disponibles sur <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/fr\/server\/dts-dronten\/\"   title=\"le serveur\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2624\">le serveur<\/a> y compris les limites sur la taille maximale des paquets et les op\u00e9rations de lecture et d'\u00e9criture. Dans sftp, la nouvelle extension est utilis\u00e9e pour choisir la taille de blocs optimale lors du transfert de donn\u00e9es.\n<li class=\"l\"> Dans sshd_config pour sshd, un param\u00e8tre ModuliFile a \u00e9t\u00e9 ajout\u00e9, permettant de sp\u00e9cifier le chemin vers le fichier \u00ab moduli \u00bb, contenant des groupes pour DH-GEX.\n<li class=\"l\"> Une variable d'environnement TEST_SSH_ELAPSED_TIMES a \u00e9t\u00e9 ajout\u00e9e aux tests unitaires pour activer l'affichage du temps \u00e9coul\u00e9 depuis le lancement de chaque test.\n<li class=\"l\"> L'interface pour demander un mot de passe pour GNOME a \u00e9t\u00e9 divis\u00e9e en deux variantes, une pour GNOME2 et l'autre pour GNOME3 (contrib\/gnome-ssk-askpass3.c). La variante pour GNOME3 utilise un appel \u00e0 gdk_seat_grab() pour am\u00e9liorer la compatibilit\u00e9 avec Wayland lors de la gestion de la capture du clavier et de la souris.\n<li class=\"l\"> Un interdit doux (soft-disallow) a \u00e9t\u00e9 ajout\u00e9 \u00e0 l'appel syst\u00e8me fstatat64 dans le sandbox Linux bas\u00e9 sur seccomp-bpf.    <\/ul>\n<p>Source : <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54986\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.6, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432\u044b LogVerbose, \u043f\u043e\u044f\u0432\u0438\u0432\u0448\u0435\u0439\u0441\u044f \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u0441\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0435\u043c\u043e\u0439 \u0432 \u043b\u043e\u0433 \u043e\u0442\u043b\u0430\u0434\u043e\u0447\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0448\u0430\u0431\u043b\u043e\u043d\u0430\u043c, \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c \u0438 \u0444\u0430\u0439\u043b\u0430\u043c, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u043c \u0441 \u043a\u043e\u0434\u043e\u043c, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u043c \u0441\u043e [&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-99965","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 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