{"id":84985,"date":"2020-06-12T13:42:15","date_gmt":"2020-06-12T11:42:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya"},"modified":"2020-06-12T13:42:15","modified_gmt":"2020-06-12T11:42:15","slug":"arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya","title":{"rendered":"ARM se ha visto comprometida: se ha descubierto una vulnerabilidad excepcional para atacar c\u00e1lculos especulativos","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Para los procesadores en una amplia variedad de arquitecturas Armv8-A (Cortex-A) se ha encontrado<\/a><\/noindex> una vulnerabilidad \u00fanica para ataques por canales laterales utilizando algoritmos de ejecuci\u00f3n especulativa. Esto fue reportado por la propia ARM, que proporcion\u00f3 parches y gu\u00edas para mitigar la vulnerabilidad encontrada. El peligro no es tan grande, pero no se debe subestimar, ya que los procesadores basados en la arquitectura ARM est\u00e1n en todas partes, lo que hace que el riesgo de filtraciones sea inimaginable en sus consecuencias.<\/p>\n

\"ARM<\/p>\n

La vulnerabilidad encontrada por especialistas de Google en las arquitecturas ARM ha recibido el nombre en c\u00f3digo Straight-Line Speculation (SLS) y la designaci\u00f3n oficial CVE-2020-13844. Seg\u00fan ARM, la vulnerabilidad SLS es una forma de la vulnerabilidad Spectre, que se hizo ampliamente conocida junto con la vulnerabilidad Meltdown en enero de 2018. En otras palabras, es una vulnerabilidad cl\u00e1sica en los mecanismos de ejecuci\u00f3n especulativa que permite ataques por canales laterales.<\/p>\n

Las ejecuciones especulativas requieren procesar datos anticipadamente a lo largo de varias ramas posibles, aunque posteriormente pueden ser descartadas como innecesarias. Los ataques por canales laterales permiten robar estos datos intermedios antes de su eliminaci\u00f3n total. Como resultado, tenemos procesadores potentes y un riesgo de filtraci\u00f3n de datos.<\/p>\n

El ataque Straight-Line Speculation a los procesadores con arquitectura ARM obliga al procesador a cada vez que hay un cambio en el flujo de comandos a ejecutar las instrucciones directamente desde la memoria, en lugar de seguir las instrucciones del nuevo flujo de comandos. Obviamente, este no es el mejor escenario para seleccionar instrucciones a ejecutar, lo cual puede ser explotado por un atacante.<\/p>\n

<\/center><\/p>\n

Acreditando a ARM, no solo ha publicado una gu\u00eda para desarrolladores que ayuda a evitar el riesgo de filtraciones a trav\u00e9s del ataque Straight-Line Speculation, sino que tambi\u00e9n ha proporcionado parches para los sistemas operativos principales, como FreeBSD, OpenBSD, Trusted Firmware-A y OP-TEE, y ha emitido parches para los compiladores GCC y LLVM.<\/p>\n

Adem\u00e1s, la empresa ha declarado que la aplicaci\u00f3n de los parches no afectar\u00e1 el rendimiento de las plataformas ARM, a diferencia de lo que ocurri\u00f3 en plataformas compatibles con x86 de Intel con el bloqueo de las vulnerabilidades Spectre y Meltdown. Sin embargo, esto lo podremos saber de fuentes externas, lo que dar\u00e1 una imagen objetiva acerca de la nueva vulnerabilidad.<\/p>\n

<\/p>\n

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Fuente: 3dnews.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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