{"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\/pt\/blog\/news\/indirector-novaya-mikroarhitekturnaya-ataka-zatragivayushhaya-cpu-intel-raptor-lake-i-alder-lake","title":{"rendered":"Indirector \u2014 um novo ataque de microarquitetura que afeta CPUs Intel Raptor Lake e Alder Lake","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pesquisadores da Universidade da Calif\u00f3rnia em San Diego apresentaram um novo m\u00e9todo de ataque a estruturas microarquitet\u00f4nicas de processadores Intel, aplic\u00e1vel entre outros a CPUs baseados nas microarquiteturas Raptor Lake e Alder Lake. O ataque, que recebeu o codinome Indirector, permite modificar o fluxo de execu\u00e7\u00e3o especulativa de instru\u00e7\u00f5es em outros processos e em outros n\u00edveis de privil\u00e9gio (por exemplo, no n\u00facleo ou em outra m\u00e1quina virtual), executados em um \u00fanico thread de CPU com o c\u00f3digo do atacante. Como demonstra\u00e7\u00e3o do funcionamento do m\u00e9todo, foi preparado um prot\u00f3tipo de exploit que permite determinar a disposi\u00e7\u00e3o de endere\u00e7os de mem\u00f3ria para contornar o mecanismo de prote\u00e7\u00e3o ASLR (Address Space Layout Randomization). Al\u00e9m disso, sob licen\u00e7a MIT, foi publicado um conjunto de ferramentas desenvolvido para an\u00e1lise e engenharia reversa da l\u00f3gica microarquitet\u00f4nica da CPU. <\/p>\n

Foram propostos dois m\u00e9todos para organizar o ataque. O primeiro m\u00e9todo baseia-se na distor\u00e7\u00e3o do conte\u00fado do buffer de previs\u00e3o de saltos indiretos IBP (Indirect Branch Predictor), utilizado para prever saltos indiretos em condi\u00e7\u00f5es onde o endere\u00e7o ou deslocamento para o salto ainda n\u00e3o s\u00e3o conhecidos e s\u00e3o calculados nas instru\u00e7\u00f5es que antecedem a instru\u00e7\u00e3o de salto. O segundo m\u00e9todo envolve o buffer de previs\u00e3o de saltos BTB (Branch Target Buffer), que cont\u00e9m informa\u00e7\u00f5es sobre saltos recentes.<\/p>\n

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

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

As vulnerabilidades identificadas permitem que o atacante determine o conte\u00fado das entradas nos buffers IBP e BTB, que cont\u00eam endere\u00e7os de saltos utilizados em processos externos, al\u00e9m de realizar a substitui\u00e7\u00e3o de um endere\u00e7o de salto arbitr\u00e1rio nas tabelas de dados dos buffers. Como resultado, o atacante pode redirecionar o fluxo de execu\u00e7\u00e3o de um processo externo para um endere\u00e7o desejado na mem\u00f3ria durante a execu\u00e7\u00e3o especulativa das instru\u00e7\u00f5es. Ap\u00f3s a determina\u00e7\u00e3o de uma previs\u00e3o incorreta, o resultado da execu\u00e7\u00e3o especulativa ser\u00e1 descartado, mas os endere\u00e7os e dados lidos da mem\u00f3ria durante o processo de execu\u00e7\u00e3o especulativa ficar\u00e3o armazenados no cache e poder\u00e3o ser extra\u00eddos utilizando um dos m\u00e9todos para determinar o conte\u00fado do cache com base na an\u00e1lise da varia\u00e7\u00e3o do tempo de acesso a dados em cache e n\u00e3o em cache. A determina\u00e7\u00e3o de endere\u00e7os exatos de saltos indiretos pode ser utilizada, na pr\u00e1tica, para contornar o mecanismo de prote\u00e7\u00e3o ASLR.
\n
Fonte: 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 um novo ataque de microarquitetura que afeta CPUs Intel Raptor Lake e Alder Lake | ProHoster","description":"Pesquisadores da Universidade da Calif\u00f3rnia em San Diego apresentaram um novo m\u00e9todo de ataque a estruturas de microarquitetura de processadores Intel, 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