{"id":39427,"date":"2019-10-31T22:32:37","date_gmt":"2019-10-31T19:32:37","guid":{"rendered":"https:\/\/prohoster.info\/blog\/10-uyazvimostej-v-gipervizore-xen\/"},"modified":"2019-10-31T22:32:37","modified_gmt":"2019-10-31T19:32:37","slug":"10-uyazvimostej-v-gipervizore-xen","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/10-uyazvimostej-v-gipervizore-xen","title":{"rendered":"10 vuln\u00e9rabilit\u00e9s dans l'hyperviseur Xen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/\">Publi\u00e9<\/a><\/noindex> informations sur 10 vuln\u00e9rabilit\u00e9s dans l'hyperviseur Xen, dont cinq (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/6\">CVE-2019-17341<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/2\">CVE-2019-17342<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/1\">CVE-2019-17340<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/5\">CVE-2019-17346<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/10\">CVE-2019-17343<\/a><\/noindex>) permettent potentiellement de sortir de l'environnement de machine virtuelle actuel et d'augmenter ses privil\u00e8ges, une vuln\u00e9rabilit\u00e9 (CVE-2019-17347) permettant \u00e0 un processus non privil\u00e9gi\u00e9 de prendre le contr\u00f4le des processus d'autres utilisateurs dans le m\u00eame syst\u00e8me invit\u00e9, les quatre vuln\u00e9rabilit\u00e9s restantes (CVE-2019-17344, CVE-2019-17345, CVE-2019-17348, CVE-2019-17351) permettant de provoquer un d\u00e9ni de service (plantage de l'environnement h\u00f4te). Les probl\u00e8mes ont \u00e9t\u00e9 r\u00e9solus dans les versions <noindex><a rel=\"nofollow\" href=\"https:\/\/xenproject.org\/downloads\/\">Xen 4.12.1, 4.11.2 et 4.10.4<\/a><\/noindex>.<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/6\">CVE-2019-17341<\/a><\/noindex> \u2014 la possibilit\u00e9 pour une machine virtuelle contr\u00f4l\u00e9e par un attaquant d'acc\u00e9der au niveau de l'hyperviseur. Le probl\u00e8me ne se manifeste que sur les syst\u00e8mes x86 et peut \u00eatre r\u00e9alis\u00e9 \u00e0 partir de machines virtuelles fonctionnant en mode paravirtualisation (PV), lors de l'ajout d'un nouveau p\u00e9riph\u00e9rique PCI \u00e0 une machine virtuelle en cours d'ex\u00e9cution. Sur les syst\u00e8mes en mode HVM et PVH, la vuln\u00e9rabilit\u00e9 ne se manifeste pas;\n<li class=\"l\">  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/1\">CVE-2019-17340<\/a><\/noindex> \u2014 une fuite de m\u00e9moire, permettant potentiellement d'augmenter ses privil\u00e8ges ou d'acc\u00e9der aux donn\u00e9es d'autres machines virtuelles.<br \/>\nLe probl\u00e8me ne se manifeste que sur des h\u00f4tes avec plus de 16 To de RAM dans des syst\u00e8mes 64 bits et 168 Go dans des syst\u00e8mes 32 bits.<br \/>\nLa vuln\u00e9rabilit\u00e9 ne peut \u00eatre exploit\u00e9e que depuis les syst\u00e8mes invit\u00e9s en mode PV (dans les modes HVM et PVH, la vuln\u00e9rabilit\u00e9 ne se manifeste pas);<\/p>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/5\">CVE-2019-17346<\/a><\/noindex> \u2014 une vuln\u00e9rabilit\u00e9 lors de l'utilisation des PCID (Identifiants de contexte de processus) pour am\u00e9liorer les performances de la protection contre les attaques.<br \/>\nMeltdown, permet d'acc\u00e9der aux donn\u00e9es d'autres syst\u00e8mes invit\u00e9s et potentiellement d'augmenter ses privil\u00e8ges. La vuln\u00e9rabilit\u00e9 ne peut \u00eatre exploit\u00e9e que depuis les syst\u00e8mes invit\u00e9s en mode PV sur des syst\u00e8mes x86 (le probl\u00e8me ne se manifeste pas dans les modes HVM et PVH, ni dans les configurations sans syst\u00e8mes invit\u00e9s avec PCID activ\u00e9 (PCID est activ\u00e9 par d\u00e9faut));<\/p>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/2\">CVE-2019-17342<\/a><\/noindex> \u2014 un probl\u00e8me dans l'impl\u00e9mentation de l'hyperappel XENMEM_exchange permet d'augmenter ses privil\u00e8ges dans des environnements avec une seule machine virtuelle. La vuln\u00e9rabilit\u00e9 ne peut \u00eatre exploit\u00e9e qu'\u00e0 partir de machines virtuelles en mode PV (dans les modes HVM et PVH, la vuln\u00e9rabilit\u00e9 ne se manifeste pas);\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/10\">CVE-2019-17343<\/a><\/noindex> \u2014 un mappage incorrect dans l'IOMMU permet, en ayant acc\u00e8s \u00e0 partir d'une machine virtuelle \u00e0 un p\u00e9riph\u00e9rique physique, d'utiliser le DMA pour modifier sa propre table de pages m\u00e9moire et d'acc\u00e9der au niveau de l'h\u00f4te. La vuln\u00e9rabilit\u00e9 ne se manifeste que dans les machines virtuelles en mode PV si l'autorisation d'ajouter des p\u00e9riph\u00e9riques PCI est pr\u00e9sente.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Source : <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51764\">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\u044b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 10 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 Xen, \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u044f\u0442\u044c (CVE-2019-17341, CVE-2019-17342, CVE-2019-17340, CVE-2019-17346, CVE-2019-17343) \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u0439\u0442\u0438 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0433\u043e \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0438 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438, \u043e\u0434\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-17347) \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0443 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c \u043d\u0430\u0434 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0432 \u0442\u043e\u0439 \u0436\u0435 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u043e\u0441\u0442\u0430\u0432\u0448\u0438\u0435\u0441\u044f \u0447\u0435\u0442\u044b\u0440\u0435 (CVE-2019-17344, CVE-2019-17345, CVE-2019-17348, CVE-2019-17351) \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c [&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-39427","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All 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