{"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\/hr\/blog\/news\/indirector-novaya-mikroarhitekturnaya-ataka-zatragivayushhaya-cpu-intel-raptor-lake-i-alder-lake","title":{"rendered":"Indirector \u2014 nova mikroarhitektonska napad koja poga\u0111a CPU Intel Raptor Lake i Alder Lake.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Istra\u017eiva\u010di s Kalifornijskog sveu\u010dili\u0161ta u San Diegu predstavili su novu metodu napada na mikroarhitektonske strukture Intel procesora, koja se mo\u017ee primijeniti, me\u0111u ostalim, na CPU-ima baziranim na mikroarhitekturama Raptor Lake i Alder Lake. Napad, koji nosi kodno ime Indirektor, omogu\u0107uje promjenu toka spekulativnog izvr\u0161avanja instrukcija u drugim procesima i na drugim razinama privilegija (npr. u jezgru ili drugoj virtualnoj ma\u0161ini), koje se izvr\u0161avaju unutar istog CPU niti s kodom napada\u010da. Kao demonstraciju rada metode, pripremljen je prototip exploita koji omogu\u0107uje odre\u0111ivanje rasporeda memorijskih adresa za zaobila\u017eenje mehanizma za\u0161tite ASLR (Randomizacija rasporeda adresnog prostora). Osim toga, pod MIT licencom objavljen je alat razvijen za analizu i obrnuto in\u017eenjerstvo mikroarhitektonske logike CPU-a. <\/p>\n

Predlo\u017eene su dvije metode organizacije napada. Prva metoda temelji se na izobli\u010denju sadr\u017eaja me\u0111uspremnika za predikciju neizravnih prijelaza IBP (Izravni prediktor prijelaza), koji se koristi za predikciju neizravnih prijelaza u uvjetima kada adresa ili offset za prijelaz jo\u0161 nisu poznati i izra\u010dunavaju se u instrukcijama koje prethode instrukciji prijelaza. Druga metoda obuhva\u0107a me\u0111uspremnik za predikciju prijelaza BTB (Me\u0111uspremnik ciljne granice), koji sadr\u017ei informacije o nedavnim prijelazima.<\/p>\n

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

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

Otkrivene ranjivosti omogu\u0107uju napada\u010du da odredi sadr\u017eaj zapisa u me\u0111uspremnicima IBP i BTB, koji sadr\u017ee adrese prijelaza kori\u0161tene u vanjskim procesima, kao i da izvr\u0161i zamjenu proizvoljne adrese prijelaza u tablicama podataka me\u0111uspremnika. Kao rezultat, napada\u010d mo\u017ee preusmjeriti tok izvr\u0161avanja vanjskog procesa na \u017eeljenu adresu u memoriji tijekom spekulativnog izvr\u0161avanja instrukcija. Nakon odre\u0111ivanja pogre\u0161nog predvi\u0111anja, rezultat spekulativnog izvr\u0161avanja bit \u0107e odbijen, no adrese i podaci u\u010ditani iz memorije tijekom spekulativnog izvr\u0161avanja instrukcija ostat \u0107e u predmemoriji i mo\u017ee ih se izvu\u0107i koriste\u0107i jednu od metoda za odre\u0111ivanje sadr\u017eaja predmemorije na temelju analize promjene vremena pristupa ke\u0161iranim i ne ke\u0161iranim podacima. Odre\u0111ivanje to\u010dnih adresa neizravnih prijelaza mo\u017ee se, na primjer, 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":"

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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 napad mikroarhitekture, koja se odnosi na CPU Intel Raptor Lake i Alder Lake | ProHoster","description":"Istra\u017eiva\u010di sa Sveu\u010dili\u0161ta Kalifornija u San Diegu predstavili su novu metodu napada na mikroarhitekturne strukture Intel procesora, primjenjivu 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