En la conferencia 38C3 se present\u00f3 el marco FlippyRAM, dise\u00f1ado para comprobar la existencia de vulnerabilidades que permitan llevar a cabo ataques de la clase Rowhammer para alterar el contenido de la memoria RAM. El c\u00f3digo de la herramienta est\u00e1 escrito en C++ y se distribuye bajo la licencia MIT. Para facilitar las pruebas, se ha creado un live-distrubutivo listo (1 GB) que permite realizar la verificaci\u00f3n al arrancar desde un USB, as\u00ed como una imagen de contenedor para Docker. <\/p>\n
El objetivo del proyecto es involucrar a los usuarios en la investigaci\u00f3n, que intenta recopilar estad\u00edsticas sobre cu\u00e1n prevalentes son las vulnerabilidades de la clase Rowhammer en sistemas de uso cotidiano. Los datos de los resultados de las pruebas pueden ser enviados tanto desde el distribuitivo cargado como a\u00f1adidos manualmente en el sitio de la investigaci\u00f3n. <\/p>\n
El m\u00e9todo de ataque Rowhammer fue propuesto hace 10 a\u00f1os, despu\u00e9s de lo cual comenz\u00f3 un juego del gato y el rat\u00f3n entre los investigadores de seguridad y los fabricantes de hardware: los fabricantes de chips de memoria intentaron bloquear la vulnerabilidad, mientras que los investigadores encontraban nuevas formas de eludirla. Adem\u00e1s de los chips DDR3 en sistemas Intel x86, se identificaron m\u00e9todos de ataque en chips DDR4 y DDR5, sistemas con procesadores AMD y ARM, opciones para eludir la correcci\u00f3n de errores ECC, formas de llevar a cabo ataques a trav\u00e9s de la red y mediante la ejecuci\u00f3n de c\u00f3digo JavaScript en el navegador. <\/p>\n
El ataque RowHammer permite distorsionar el contenido de bits individuales de la memoria DRAM mediante una lectura c\u00edclica de datos de celdas de memoria adyacentes. Dado que la memoria DRAM representa un arreglo bidimensional de celdas, cada una compuesta por un condensador y un transistor, realizar lecturas continuas de la misma \u00e1rea de memoria provoca fluctuaciones de voltaje y anomal\u00edas que ocasionan una peque\u00f1a p\u00e9rdida de carga en las celdas adyacentes. Si la intensidad de lectura es alta, la celda adyacente puede perder una cantidad suficientemente grande de carga y el siguiente ciclo de regeneraci\u00f3n no logra restaurar su estado original, lo que resulta en un cambio en el valor de datos almacenado en la celda. Para protegerse contra RowHammer, los fabricantes de chips han a\u00f1adido un mecanismo TRR (Target Row Refresh), que bloquea la distorsi\u00f3n de celdas en casos particulares, pero no protege contra todas las posibles variantes de ataque. \u041d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 38C3 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a FlippyRAM, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0441\u043e\u0432\u0435\u0440\u0448\u0438\u0442\u044c \u0430\u0442\u0430\u043a\u0438 \u043a\u043b\u0430\u0441\u0441\u0430 Rowhammer \u0434\u043b\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438. \u041a\u043e\u0434 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u0421++ \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 MIT. \u0414\u043b\u044f \u0443\u043f\u0440\u043e\u0449\u0435\u043d\u0438\u044f \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d \u0433\u043e\u0442\u043e\u0432\u044b\u0439 live-\u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432 (1 \u0413\u0411), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043f\u0440\u043e\u0432\u0435\u0441\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443, \u0437\u0430\u0433\u0440\u0443\u0437\u0438\u0432\u0448\u0438\u0441\u044c \u0441 USB Flash, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043e\u0431\u0440\u0430\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0434\u043b\u044f Docker. \u0426\u0435\u043b\u044c\u044e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-121204","post","type-post","status-publish","format-standard","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\udd47FlippyRAM \u2014 distribuci\u00f3n para probar ataques Rowhammer | ProHoster","description":"En la conferencia 38C3 se present\u00f3 el marco FlippyRAM, dise\u00f1ado para comprobar la existencia de vulnerabilidades que permiten realizar ataques del tipo Rowhammer para alterar el contenido de la memoria 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\u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a FlippyRAM, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0441\u043e\u0432\u0435\u0440\u0448\u0438\u0442\u044c \u0430\u0442\u0430\u043a\u0438 \u043a\u043b\u0430\u0441\u0441\u0430 Rowhammer \u0434\u043b\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 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Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"