{"id":121973,"date":"2025-02-17T14:22:13","date_gmt":"2025-02-17T12:22:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-cpu-amd-pozvolyayushhie-vypolnit-kod-na-urovne-smm"},"modified":"2025-02-17T14:22:13","modified_gmt":"2025-02-17T12:22:13","slug":"uyazvimosti-v-cpu-amd-pozvolyayushhie-vypolnit-kod-na-urovne-smm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimosti-v-cpu-amd-pozvolyayushhie-vypolnit-kod-na-urovne-smm","title":{"rendered":"Vuln\u00e9rabilit\u00e9s dans les processeurs AMD permettant d'ex\u00e9cuter du code en mode SMM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>AMD a annonc\u00e9 avoir corrig\u00e9 six vuln\u00e9rabilit\u00e9s dans les processeurs AMD EPYC et AMD Ryzen. Les trois vuln\u00e9rabilit\u00e9s les plus critiques (CVE-2023-31342, CVE-2023-31343, CVE-2023-31345) pourraient permettre l'ex\u00e9cution de code en mode SMM (System Management Mode), qui a un niveau de priorit\u00e9 sup\u00e9rieur \u00e0 celui de l'hyperviseur et du niveau z\u00e9ro de protection. La compromission du SMM donne un acc\u00e8s illimit\u00e9 \u00e0 toute la m\u00e9moire syst\u00e8me et peut \u00eatre utilis\u00e9e pour contr\u00f4ler le syst\u00e8me d'exploitation. Les vuln\u00e9rabilit\u00e9s sont dues \u00e0 un manque de validation des entr\u00e9es dans le gestionnaire SMM, ce qui permet \u00e0 un attaquant privil\u00e9gi\u00e9 de r\u00e9\u00e9crire le contenu du SMRAM. Les d\u00e9tails sur la m\u00e9thode d'attaque ne sont pas encore divulgu\u00e9s.      <\/p>\n<p>Autres vuln\u00e9rabilit\u00e9s :  <\/p>\n<ul>\n<li class=\"l\"> CVE-2023-31352 \u2014 erreur dans le firmware du m\u00e9canisme AMD SEV (Secure Encrypted Virtualization), utilis\u00e9 dans les syst\u00e8mes de virtualisation pour la protection. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/fr\/vps\/\"   title=\"machines virtuelles\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2136\">machines virtuelles<\/a> contre les interf\u00e9rences de l'hyperviseur ou d'un administrateur du syst\u00e8me h\u00f4te. De mani\u00e8re similaire \u00e0 la vuln\u00e9rabilit\u00e9 corrig\u00e9e d\u00e9but f\u00e9vrier, ce probl\u00e8me permet \u00e0 un administrateur ayant acc\u00e8s \u00e0 l'environnement h\u00f4te de lire le contenu non chiffr\u00e9 de la m\u00e9moire, o\u00f9 des donn\u00e9es confidentielles du syst\u00e8me invit\u00e9 peuvent potentiellement se trouver.\n<li class=\"l\"> CVE-2023-20582 \u2014 possibilit\u00e9 de contourner les v\u00e9rifications RMP (Reverse Map Table) lors de l'utilisation de l'extension SEV-SNP (Secure Nested Paging), con\u00e7ue pour une utilisation s\u00e9curis\u00e9e avec des tables de pages m\u00e9moire imbriqu\u00e9es. Un attaquant ayant des droits d'administrateur peut cr\u00e9er les conditions pour g\u00e9n\u00e9rer une exception (fault) dans l'entr\u00e9e de la table des pages (PTE) afin de contourner les mesures de protection de l'int\u00e9grit\u00e9 de la m\u00e9moire des machines virtuelles.\n<li class=\"l\"> CVE-2023-20581 \u2014 erreur de gestion des acc\u00e8s \u00e0 l'IOMMU, permettant \u00e0 un attaquant privil\u00e9gi\u00e9 de contourner la v\u00e9rification RMP et de compromettre l'int\u00e9grit\u00e9 de la m\u00e9moire du syst\u00e8me invit\u00e9.  <\/ul>\n<p>Les vuln\u00e9rabilit\u00e9s se manifestent dans les processeurs serveurs AMD EPYC de 3e et 4e g\u00e9n\u00e9rations, dans les CPU int\u00e9gr\u00e9s des s\u00e9ries AMD EPYC 7003 et 9004, dans les AMD Ryzen Embedded R1000, R2000, 5000, 7000, V2000 et V3000, ainsi que dans les s\u00e9ries de bureau AMD Ryzen 3000, 4000, 5000, 7000 et 8000, ainsi que dans la s\u00e9rie AMD Athlon 3000.<br \/>\n<br \/>Source : <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=62734\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f AMD \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0430 \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438 \u0448\u0435\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 AMD EPYC \u0438 AMD Ryzen. \u0422\u0440\u0438 \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u044b\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-31342, CVE-2023-31343, CVE-2023-31345) \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 SMM (System Management Mode), \u0438\u043c\u0435\u044e\u0449\u0435\u043c \u0431\u043e\u043b\u0435\u0435 \u0432\u044b\u0441\u043e\u043a\u0438\u0439 \u043f\u0440\u0438\u043e\u0440\u0438\u0442\u0435\u0442, \u0447\u0435\u043c \u0440\u0435\u0436\u0438\u043c \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 \u0438 \u043d\u0443\u043b\u0435\u0432\u043e\u0435 \u043a\u043e\u043b\u044c\u0446\u043e \u0437\u0430\u0449\u0438\u0442\u044b. \u041a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u044f SMM \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043d\u0435\u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a\u043e \u0432\u0441\u0435\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u0438 \u043c\u043e\u0436\u0435\u0442 [&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-121973","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\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f AMD \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0430 \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438 \u0448\u0435\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 AMD EPYC \u0438 AMD Ryzen.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta 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