{"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\/sl\/blog\/news\/indirector-novaya-mikroarhitekturnaya-ataka-zatragivayushhaya-cpu-intel-raptor-lake-i-alder-lake","title":{"rendered":"Indirector \u2014 nova mikroarhitekturna napad, ki vpliva na CPU Intel Raptor Lake in Alder Lake","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Raziskovalci z Univerze v Kaliforniji v San Diegu so predstavili novo metodo napada na mikroarhitekturne strukture procesorjev Intel, ki se lahko uporablja tudi na CPU-jih z mikroarhitekturama Raptor Lake in Alder Lake. Napad, ki je dobil kodno ime Indirector, omogo\u010da spremembo toka spekulativnega izvajanja ukazov v drugih procesih in na drugih ravneh privilegijev (na primer v jedru ali v drugi virtualni napravi), ki se izvajajo v enem CPU toku s kodo napadalca. Kot demonstracija delovanja metode je bil pripravljen prototip eksploita, ki omogo\u010da dolo\u010ditev razporeditve naslovov pomnilnika za obhod za\u0161\u010ditnega mehanizma ASLR (Randomizacija razporeditve naslovnega prostora). Poleg tega je pod licenco MIT objavljeno orodje, zasnovano za analizo in vra\u010danje in\u017eeniringa mikroarhitekturne logike CPU. <\/p>\n

Predlagani sta dve metodi organizacije napada. Prva metoda temelji na izkrivljanju vsebine predvidenega predpomnilnika indirektnih prehodov IBP (Predvideni pomnilnik indirektnih prehodov), ki se uporablja za napovedovanje indirektnih prehodov v pogojih, ko naslov ali odmik za prehod \u0161e nista znana in se izra\u010dunata v navodilih, ki so pred prehodnim ukazom. Druga metoda se nana\u0161a na predpomnilnik prehodov BTB (Predpomnilnik ciljnih prehodov), ki vsebuje informacije o nedavnih prehodih.<\/p>\n

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

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

Identificirane ranjivosti omogu\u0107uju napada\u010du da odredi sadr\u017eaj zapisa u IBP i BTB baferima, koji sadr\u017ee adrese prelaza koje koriste vanjski procesi, kao i da izvr\u0161i zamenu proizvoljnog prelaznog adresa u tabelama podataka bafera. Na taj na\u010din napada\u010d mo\u017ee da postigne preusmeravanje toka izvr\u0161avanja vanjskog procesa na \u017eeljenu adresu u memoriji u toku spekulativnog izvr\u0161avanja instrukcija. Nakon \u0161to se utvrdi pogre\u0161na procena, rezultat spekulativnog izvr\u0161avanja bi\u0107e odbacen, ali adrese i podaci o\u010ditani iz memorije tokom spekulativnog izvr\u0161avanja instrukcija bi\u0107e pohranjeni u ke\u0161u i mo\u0107i \u0107e se izvu\u0107i koriste\u0107i jedan od na\u010dina odre\u0111ivanja sadr\u017eaja ke\u0161a na osnovu analize promene vremena pristupa ke\u0161iranim i neke\u0161iranim podacima. Odre\u0111ivanje ta\u010dnih adresa indirektnih prelaza u praksi, na primer, mo\u017ee se koristiti za zaobila\u017eenje mehanizma za\u0161tite ASLR.
\n
Izvor: 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 nova mikroarhitektonska napada koja se ti\u010de CPU Intel Raptor Lake i Alder Lake | ProHoster","description":"Istra\u017eiva\u010di sa Univerziteta Kalifornija u San Dijegu predstavili su novu metodu napada na mikroarhitektonske strukture Intel procesora, koja se mo\u017ee 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