{"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\/es\/blog\/news\/indirector-novaya-mikroarhitekturnaya-ataka-zatragivayushhaya-cpu-intel-raptor-lake-i-alder-lake","title":{"rendered":"Indirector \u2014 un nuevo ataque microarquitect\u00f3nico que afecta a las CPU Intel Raptor Lake y Alder Lake.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Investigadores de la Universidad de California en San Diego han presentado un nuevo m\u00e9todo de ataque a las microestructuras de los procesadores Intel, aplicable, entre otros, a las CPU basadas en las microarquitecturas Raptor Lake y Alder Lake. El ataque, que ha recibido el nombre en clave Indirector, permite modificar el curso de la ejecuci\u00f3n especulativa de instrucciones en otros procesos y en otros niveles de privilegio (por ejemplo, en el n\u00facleo o en otra m\u00e1quina virtual) que se ejecutan en un mismo hilo de CPU con el c\u00f3digo del atacante. Como demostraci\u00f3n del funcionamiento del m\u00e9todo, se ha preparado un prototipo de exploit que permite determinar la disposici\u00f3n de las direcciones de memoria para eludir el mecanismo de protecci\u00f3n ASLR (Randomizaci\u00f3n de la Disposici\u00f3n del Espacio de Direcciones). Adem\u00e1s, bajo la licencia MIT se ha publicado una herramienta dise\u00f1ada para el an\u00e1lisis y la ingenier\u00eda inversa de la l\u00f3gica microarquitect\u00f3nica de la CPU. <\/p>\n

Se han propuesto dos m\u00e9todos para organizar el ataque. El primer m\u00e9todo se basa en la alteraci\u00f3n del contenido del b\u00fafer de predicci\u00f3n de saltos indirectos IBP (Indirect Branch Predictor), utilizado para predecir saltos indirectos en condiciones donde la direcci\u00f3n o el desplazamiento para el salto a\u00fan no se conocen y se calculan en las instrucciones que preceden a la instrucci\u00f3n de salto. El segundo m\u00e9todo se ocupa del b\u00fafer de predicci\u00f3n de saltos BTB (Branch Target Buffer), que contiene informaci\u00f3n sobre los saltos recientes.<\/p>\n

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

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

Las vulnerabilidades identificadas permiten al atacante determinar el contenido de las entradas en los b\u00faferes IBP y BTB, que contienen las direcciones de los saltos utilizados en procesos externos, as\u00ed como realizar una sustituci\u00f3n de una direcci\u00f3n de salto arbitraria en las tablas de datos de los b\u00faferes. Como resultado, el atacante puede redirigir el flujo de ejecuci\u00f3n de un proceso externo a una direcci\u00f3n deseada en la memoria durante la ejecuci\u00f3n especulativa de instrucciones. Despu\u00e9s de determinar la predicci\u00f3n incorrecta, el resultado de la ejecuci\u00f3n especulativa se descartar\u00e1, pero las direcciones y los datos le\u00eddos de la memoria durante la ejecuci\u00f3n especulativa se mantendr\u00e1n en la cach\u00e9 y podr\u00e1n ser extra\u00eddos utilizando uno de los m\u00e9todos para determinar el contenido de la cach\u00e9 basado en el an\u00e1lisis de la variaci\u00f3n en el tiempo de acceso a datos en cach\u00e9 frente a no en cach\u00e9. La determinaci\u00f3n de las direcciones exactas de los saltos indirectos, en la pr\u00e1ctica, podr\u00eda utilizarse para eludir el mecanismo de protecci\u00f3n ASLR.
\n
Fuente: 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 un nuevo ataque de microarquitectura que afecta a los CPU Intel Raptor Lake y Alder Lake | ProHoster","description":"Investigadores de la Universidad de California en San Diego han presentado un nuevo m\u00e9todo de ataque a las estructuras microarquitect\u00f3nicas de los 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