{"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\/sv\/blog\/news\/indirector-novaya-mikroarhitekturnaya-ataka-zatragivayushhaya-cpu-intel-raptor-lake-i-alder-lake","title":{"rendered":"Indirector \u2014 ett nytt mikroarkitekturellt angrepp som p\u00e5verkar Intel Raptor Lake och Alder Lake CPU:er","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Forskare fr\u00e5n Kaliforniens universitet i San Diego har presenterat en ny attackmetod p\u00e5 mikroarkitekturstrukturer hos Intel-processorer, som kan till\u00e4mpas p\u00e5 CPU:er baserade p\u00e5 mikroarkitekturerna Raptor Lake och Alder Lake. Attacken, som har kodnamnet Indirector, m\u00f6jligg\u00f6r en f\u00f6r\u00e4ndring av den spekulativa exekveringen av instruktioner i andra processer och p\u00e5 andra privilegieniv\u00e5er (till exempel i k\u00e4rnan eller en annan virtuell maskin) som k\u00f6rs i samma CPU-tr\u00e5d som angriparens kod. Som en demonstration av metodens arbete har en prototyp av ett exploit skapats, som g\u00f6r det m\u00f6jligt att fastst\u00e4lla layouten av minnesadresser f\u00f6r att kringg\u00e5 ASLR (Address Space Layout Randomization) skyddsmekanismen. Dessutom har verktyg under MIT-licens publicerats, utvecklade f\u00f6r analys och omv\u00e4nd ingenj\u00f6rskonst av mikroarkitekturlogik i CPU:er. <\/p>\n

Tv\u00e5 metoder f\u00f6r att organisera attacken har f\u00f6reslagits. Den f\u00f6rsta metoden baseras p\u00e5 f\u00f6rvr\u00e4ngning av inneh\u00e5llet i bufferten f\u00f6r f\u00f6ruts\u00e4gelse av indirekta hopp (IBP - Indirect Branch Predictor), som anv\u00e4nds f\u00f6r att f\u00f6ruts\u00e4ga indirekta hopp i situationer d\u00e4r adressen eller f\u00f6rskjutningen f\u00f6r hoppet \u00e4nnu inte \u00e4r k\u00e4nd och ber\u00e4knas i instruktionerna som f\u00f6reg\u00e5r hoppinstruationen. Den andra metoden ber\u00f6r bufferten f\u00f6r hopping\u00e5ngar (BTB - Branch Target Buffer), som inneh\u00e5ller information om nyligen intr\u00e4ffade hopp.<\/p>\n

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

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

De identifierade s\u00e5rbarheterna ger angriparen m\u00f6jlighet att best\u00e4mma inneh\u00e5llet i posterna i buffrarna IBP och BTB, som inneh\u00e5ller hoppadresser som anv\u00e4nds i externa processer, samt att genomf\u00f6ra inmatningen av en godtycklig hoppadress i databufferttabelle. Resultatet blir att angriparen kan omdirigera exekveringsfl\u00f6det f\u00f6r den externa processen till en \u00f6nskad adress i minnet under den spekulativa exekveringen av instruktionerna. Efter att en felaktig f\u00f6ruts\u00e4gelse har identifierats kommer resultatet av den spekulativa exekveringen att kasseras, men adresser och data som l\u00e4sts fr\u00e5n minnet under den spekulativa exekveringen kommer att lagras i cachen och kan extraheras genom att anv\u00e4nda n\u00e5gon av metoderna f\u00f6r att best\u00e4mma inneh\u00e5llet i cachen baserat p\u00e5 analys av \u00e4ndringarna i accesstiden f\u00f6r cachade och icke-cachade data. Att fastst\u00e4lla exakta adresser f\u00f6r indirekta hopp kan i praktiken anv\u00e4ndas f\u00f6r att kringg\u00e5 ASLR-skyddsmekanismen.
\n
K\u00e4lla: 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\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 en ny mikroarkitekturattack som p\u00e5verkar Intel Raptor Lake och Alder Lake CPU:er | ProHoster","description":"Forskare fr\u00e5n universitetet i Kalifornien, San Diego, har presenterat en ny attackmetod mot mikroarkitekturstrukturer i Intel-processorer, som bland annat \u00e4r 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