{"id":119185,"date":"2024-08-08T09:43:01","date_gmt":"2024-08-08T07:43:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-ghostwrite-predostavlyayushhaya-polnyj-dostup-k-fizicheskoj-pamyati-na-cpu-risc-v-xuantie"},"modified":"2024-08-08T09:43:01","modified_gmt":"2024-08-08T07:43:01","slug":"uyazvimost-ghostwrite-predostavlyayushhaya-polnyj-dostup-k-fizicheskoj-pamyati-na-cpu-risc-v-xuantie","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-ghostwrite-predostavlyayushhaya-polnyj-dostup-k-fizicheskoj-pamyati-na-cpu-risc-v-xuantie","title":{"rendered":"La vuln\u00e9rabilit\u00e9 GhostWrite, qui permet un acc\u00e8s complet \u00e0 la m\u00e9moire physique sur le CPU RISC-V XuanTie","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Les chercheurs du Centre Helmholtz de s\u00e9curit\u00e9 informatique (CISPA) ont publi\u00e9 les r\u00e9sultats d'une \u00e9tude sur la s\u00e9curit\u00e9 des processeurs bas\u00e9s sur l'architecture RISC-V et ont r\u00e9v\u00e9l\u00e9 des informations sur une vuln\u00e9rabilit\u00e9 cod\u00e9e sous le nom de GhostWrite. Cette vuln\u00e9rabilit\u00e9 affecte les processeurs RISC-V XuanTie C910, fabriqu\u00e9s par la soci\u00e9t\u00e9 chinoise T-Head (une filiale d'Alibaba) et d\u00e9velopp\u00e9s sous forme de projets ouverts. Elle permet \u00e0 un attaquant ayant un acc\u00e8s limit\u00e9 et non privil\u00e9gi\u00e9 au syst\u00e8me de lire et d\u2019\u00e9crire dans n'importe quelle zone de la m\u00e9moire physique, ainsi que d'acc\u00e9der \u00e0 la gestion des p\u00e9riph\u00e9riques tels que les cartes r\u00e9seau utilisant MMIO (Input\/Output mapp\u00e9 en m\u00e9moire).      <\/p>\n<p>La vuln\u00e9rabilit\u00e9 est caus\u00e9e par des lacunes dans l'architecture du processeur, li\u00e9es \u00e0 l'isolation des instructions processeur ajout\u00e9es par le fabricant, qui \u00e9tendent l'architecture de l'ensemble des instructions RISC-V et permettent un acc\u00e8s direct \u00e0 la DRAM, contournant ainsi les m\u00e9canismes de m\u00e9moire virtuelle. L'utilisation de certaines instructions \u00e9tendues travaillant directement avec la m\u00e9moire physique au lieu de la m\u00e9moire virtuelle permet de contourner l'isolation de la m\u00e9moire entre les processus.        <\/p>\n<p>La technique d'attaque pr\u00e9par\u00e9e est reproductible \u00e0 100 % et n\u00e9cessite l'ex\u00e9cution de son code en quelques microsecondes. Les m\u00e9thodes d'isolation logicielle, telles que les conteneurs et les environnements sandbox, ne nuisent pas \u00e0 l'exploitation de la vuln\u00e9rabilit\u00e9. Pour bloquer la vuln\u00e9rabilit\u00e9, seule la d\u00e9sactivation compl\u00e8te du support des extensions vectorielles est efficace, ce qui entra\u00eene une r\u00e9duction de performance de 33 % dans les tests rvv-bench (dans la notice du rapport, il est mentionn\u00e9 77 %, mais sur la page r\u00e9capitulative \u2014 33 %, avec des d\u00e9tails indiquant une diminution de performance de memcpy de 33 % et de memset de 8 %), r\u00e9duisant \u00e9galement d'environ la moiti\u00e9 l'ensemble des instructions processeur disponibles pour les applications.       <\/p>\n<p>Les CPU XuanTie C910 sont parmi les puces RISC-V les plus performantes disponibles sur le march\u00e9, et elles sont d\u00e9j\u00e0 largement utilis\u00e9es dans <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/fr\/server\/dts-gdansk\/\"   title=\"serveurs\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4560\">serveurs<\/a> des syst\u00e8mes cloud et des ordinateurs portables. Par exemple, le probl\u00e8me se manifeste dans les serveurs Scaleway Elastic Metal RV1, les clusters Lichee Cluster 4A, l\u2019ordinateur portable Lichee Book 4A, la console de jeux Lichee Console 4A, le mini-ordinateur Lichee Pocket 4A, les cartes m\u00e8re Sipeed Lichee Pi 4A, Milk-V Meles et BeagleV-Ahead.            <\/p>\n<p>\u00c0 titre d'exemple, des chercheurs ont pr\u00e9par\u00e9 un exploit permettant \u00e0 un utilisateur non privil\u00e9gi\u00e9 d'obtenir des droits root sur Linux. L'exploit modifie le contenu de la table des pages en m\u00e9moire, utilis\u00e9e pour traduire les adresses virtuelles en adresses physiques, afin d'obtenir des adresses virtuelles li\u00e9es \u00e0 n'importe quelle adresse physique. Un exemple d'exploit a \u00e9galement \u00e9t\u00e9 pr\u00e9par\u00e9 pour lire le contenu de la m\u00e9moire du noyau et d'autres processus, ce qui permet d'extraire les cl\u00e9s de chiffrement et les mots de passe stock\u00e9s en m\u00e9moire.          <center>  <video  controls=\"\" style=\"width: 700px; height: 400px; max-width:100%\"><source src=\"https:\/\/ghostwriteattack.com\/kernel-getuid-sudo-attack.mp4\" type=\"video\/mp4\"><\/video>  <\/center>        <\/p>\n<p>De plus, les chercheurs ont identifi\u00e9 deux autres vuln\u00e9rabilit\u00e9s architecturales moins dangereuses \u2014 l'une affecte les processeurs T-Head XuanTie C906, et l'autre, le T-Head XuanTie C908. Les deux vuln\u00e9rabilit\u00e9s se limitent \u00e0 un appel de d\u00e9ni de service en raison de l'arr\u00eat du CPU. Ces vuln\u00e9rabilit\u00e9s peuvent poser un risque pour les plateformes cloud bas\u00e9es sur des puces T-Head XuanTie, car un acc\u00e8s au code d'ex\u00e9cution dans un environnement cloud permet d'interrompre le service d'autres utilisateurs h\u00e9berg\u00e9s sur le m\u00eame. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/fr\/server\/dts-newyork\/\"   title=\"le serveur\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2777\">le serveur<\/a>.      <\/p>\n<p>Des probl\u00e8mes ont \u00e9t\u00e9 identifi\u00e9s \u00e0 l'aide du framework RISCVuzz, con\u00e7u pour le test de fuzzing des CPU. Ce framework met en \u00e9vidence les diff\u00e9rences dans l'impl\u00e9mentation d'instructions \u00e9tendues identiques sur diff\u00e9rents CPU, conform\u00e9ment \u00e0 l'hypoth\u00e8se selon laquelle, en l'absence d'un registre unique pour les extensions du jeu d'instructions RISC-V, des instructions cod\u00e9es de mani\u00e8re identique sur des puces de diff\u00e9rents fabricants peuvent entra\u00eener des actions diff\u00e9rentes. La v\u00e9rification consistait \u00e0 comparer le comportement lors du traitement des instructions processeur sur diff\u00e9rents CPU RISC-V et \u00e0 analyser les vuln\u00e9rabilit\u00e9s potentielles dans les situations observ\u00e9es o\u00f9 des comportements divergents \u00e9taient not\u00e9s.<br \/>\n<br \/>Source : <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61671\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0426\u0435\u043d\u0442\u0440\u0430 \u0413\u0435\u043b\u044c\u043c\u0433\u043e\u043b\u044c\u0446\u0430 \u043f\u043e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (CISPA) \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 \u043d\u0430 \u0431\u0430\u0437\u0435 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b RISC-V \u0438 \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u0439 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f GhostWrite. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 RISC-V-\u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u044b XuanTie C910, \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u043c\u044b\u0435 \u043a\u0438\u0442\u0430\u0439\u0441\u043a\u043e\u0439 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 T-Head (\u043f\u043e\u0434\u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u0435 Alibaba) \u0438 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u0432 \u0444\u043e\u0440\u043c\u0435 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443, \u0438\u043c\u0435\u044e\u0449\u0435\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0447\u0442\u0435\u043d\u0438\u044f \u0438 [&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-119185","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0426\u0435\u043d\u0442\u0440\u0430 \u0413\u0435\u043b\u044c\u043c\u0433\u043e\u043b\u044c\u0446\u0430 \u043f\u043e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (CISPA) 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content=\"2024-08-08T07:43:01+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-08-08T07:43:01+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47La vuln\u00e9rabilit\u00e9 GhostWrite, fournissant un acc\u00e8s complet \u00e0 la m\u00e9moire physique sur le CPU RISC-V XuanTie | ProHoster","description":"Les chercheurs du Centre Helmholtz pour la s\u00e9curit\u00e9 de l'information (CISPA) ont publi\u00e9 les r\u00e9sultats de leur \u00e9tude sur la s\u00e9curit\u00e9 des processeurs bas\u00e9s sur l'architecture RISC-V et ont r\u00e9v\u00e9l\u00e9 des informations concernant une vuln\u00e9rabilit\u00e9 ayant re\u00e7u un 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