{"id":116935,"date":"2024-07-04T15:05:10","date_gmt":"2024-07-04T13:05:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/indirector-novaya-mikroarhitekturnaya-ataka-zatragivayushhaya-cpu-intel-raptor-lake-i-alder-lake"},"modified":"2024-07-04T15:05:10","modified_gmt":"2024-07-04T13:05:10","slug":"indirector-novaya-mikroarhitekturnaya-ataka-zatragivayushhaya-cpu-intel-raptor-lake-i-alder-lake","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/indirector-novaya-mikroarhitekturnaya-ataka-zatragivayushhaya-cpu-intel-raptor-lake-i-alder-lake","title":{"rendered":"Indirector \u2014 une nouvelle attaque microarchitecturale touchant les CPU Intel Raptor Lake et Alder Lake","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Des chercheurs de l'Universit\u00e9 de Californie \u00e0 San Diego ont pr\u00e9sent\u00e9 une nouvelle m\u00e9thode d'attaque sur les structures microarchitecturales des processeurs Intel, applicable notamment aux CPU bas\u00e9s sur les microarchitectures Raptor Lake et Alder Lake. L'attaque, qui a re\u00e7u le nom de code Indirector, permet de modifier le cours de l'ex\u00e9cution sp\u00e9culative des instructions dans d'autres processus et \u00e0 d'autres niveaux de privil\u00e8ges (par exemple, dans le noyau ou une autre machine virtuelle), ex\u00e9cut\u00e9s sur un m\u00eame thread CPU avec le code de l'attaquant. Comme d\u00e9monstration du fonctionnement de la m\u00e9thode, un prototype d'exploit a \u00e9t\u00e9 pr\u00e9par\u00e9, permettant de d\u00e9terminer la disposition des adresses m\u00e9moire pour contourner le m\u00e9canisme de protection ASLR (Address Space Layout Randomization). De plus, des outils ont \u00e9t\u00e9 publi\u00e9s sous licence MIT, con\u00e7us pour analyser et effectuer de l'ing\u00e9nierie inverse de la logique microarchitecturale des CPU. <\/p>\n

Deux m\u00e9thodes d'organisation de l'attaque ont \u00e9t\u00e9 propos\u00e9es. La premi\u00e8re m\u00e9thode repose sur la distorsion du contenu du tampon de pr\u00e9diction des branches indirectes (IBP - Indirect Branch Predictor), utilis\u00e9 pour pr\u00e9dire les branches indirectes lorsque l'adresse ou le d\u00e9calage pour la transition n'est pas encore connu et est calcul\u00e9 dans les instructions pr\u00e9c\u00e9dant l'instruction de transition. La seconde m\u00e9thode concerne le tampon de pr\u00e9diction des transitions (BTB - Branch Target Buffer), qui contient des informations sur les transitions r\u00e9centes.<\/p>\n

\"Indirector<\/center><\/p>\n

\"Indirector<\/center><\/p>\n

Les vuln\u00e9rabilit\u00e9s identifi\u00e9es permettent \u00e0 un attaquant de d\u00e9terminer le contenu des enregistrements dans les tampons IBP et BTB, contenant des adresses de saut utilis\u00e9es dans des processus externes, ainsi que de substituer une adresse de saut arbitraire dans les tables de donn\u00e9es des tampons. En cons\u00e9quence, l'attaquant peut provoquer le redirection du flux d'ex\u00e9cution d'un processus externe vers l'adresse souhait\u00e9e en m\u00e9moire lors de l'ex\u00e9cution sp\u00e9culative des instructions. Apr\u00e8s avoir identifi\u00e9 une pr\u00e9diction erron\u00e9e, le r\u00e9sultat de l'ex\u00e9cution sp\u00e9culative sera rejet\u00e9, mais les adresses et les donn\u00e9es lues en m\u00e9moire au cours de cette ex\u00e9cution sp\u00e9culative resteront dans le cache et pourront \u00eatre extraites en utilisant l'une des m\u00e9thodes de d\u00e9termination du contenu du cache bas\u00e9es sur l'analyse des variations de temps d'acc\u00e8s aux donn\u00e9es mises en cache et non mises en cache. La d\u00e9termination des adresses exactes des sauts indirects peut, dans la pratique, \u00eatre utilis\u00e9e pour contourner le m\u00e9canisme de protection ASLR.
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u041a\u0430\u043b\u0438\u0444\u043e\u0440\u043d\u0438\u0439\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432 \u0421\u0430\u043d-\u0414\u0438\u0435\u0433\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u043c\u0438\u043a\u0440\u043e\u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043d\u044b\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 Intel, \u043f\u0440\u0438\u043c\u0435\u043d\u0438\u043c\u044b\u0439 \u0441\u0440\u0435\u0434\u0438 \u043f\u0440\u043e\u0447\u0435\u0433\u043e \u043a CPU \u043d\u0430 \u0431\u0430\u0437\u0435 \u043c\u0438\u043a\u0440\u043e\u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440 Raptor Lake \u0438 Alder Lake. \u0410\u0442\u0430\u043a\u0430, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Indirector, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0445\u043e\u0434\u0430 \u0441\u043f\u0435\u043a\u0443\u043b\u044f\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439 \u0432 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u0445 \u0438 \u043d\u0430 \u0434\u0440\u0443\u0433\u0438\u0445 \u0443\u0440\u043e\u0432\u043d\u044f\u0445 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432 \u044f\u0434\u0440\u0435 \u0438\u043b\u0438 \u0434\u0440\u0443\u0433\u043e\u0439 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":116936,"comment_status":"","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-116935","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Indirector \u2014 nouvelle attaque microarchitecturale touchant les CPU Intel Raptor Lake et Alder Lake | ProHoster","description":"Des chercheurs de l'universit\u00e9 de Californie \u00e0 San Diego ont propos\u00e9 une nouvelle m\u00e9thode d'attaque sur les structures microarchitecturales des 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