{"id":141,"date":"2018-11-05T09:56:38","date_gmt":"2018-11-05T14:56:38","guid":{"rendered":"http:\/\/demo.athemes.com\/sydney\/?p=141"},"modified":"2019-01-01T20:26:38","modified_gmt":"2019-01-02T01:26:38","slug":"portsmash","status":"publish","type":"post","link":"https:\/\/etic-solutions.net\/etic\/portsmash","title":{"rendered":"PortSmash: Nueva vulnerabilidad que afecta a CPUs Intel"},"content":{"rendered":"<p><a href=\"https:\/\/www.zdnet.com\/article\/intel-cpus-impacted-by-new-portsmash-side-channel-vulnerability\/\" target=\"_blank\" rel=\"noopener\">Un grupo de investigadores<\/a>&nbsp;de la Universidad Tecnol\u00f3gica de Tampere, en Finlandia, y la Universidad Tecnol\u00f3gica de la Habana, en Cuba, ha descubierto una nueva vulnerabilidad que afecta a procesadores Intel. Ha sido &#8220;bautizada&#8221; como&nbsp;<a href=\"https:\/\/github.com\/bbbrumley\/portsmash\" target=\"_blank\" rel=\"noopener\">PortSmash (CVE-2018-5407)<\/a>&nbsp;y de momento se ha confirmado su presencia en las generaciones Skylake y Kaby Lake, es decir, en los procesadores Core de sexta y s\u00e9ptima generaci\u00f3n.<\/p>\n<p style=\"text-align: left;\">PortSmash es el primer resultado detr\u00e1s del trabajo de cinco a\u00f1os del European Research Council &#8220;<a href=\"https:\/\/pervasive.cs.tut.fi\/?p=2747\" target=\"_blank\" rel=\"noopener noreferrer\">SCARE: Side-Channel Aware Engineering<\/a>&#8221; en la Universidad de Tampere.<\/p>\n<p>En los documentos que han facilitado los investigadores podemos ver que PortSmash permite a los atacantes filtrar datos encriptados de los procesos internos de la CPU, recurriendo a lo que se conoce como un ataque de canal lateral. Este tipo de ataque se describe como una t\u00e9cnica utilizada para filtrar datos encriptados de la memoria de una computadora o del procesador que funciona a trav\u00e9s del registro y an\u00e1lisis de discrepancias en los tiempos de operaci\u00f3n, consumo de energ\u00eda, fugas electromagn\u00e9ticas o incluso sonido para obtener informaci\u00f3n adicional que sea \u00fatil para romper los algoritmos de cifrado y recuperar los datos procesados \u200b\u200bpor la CPU.<\/p>\n<p>Dicho en t\u00e9rminos m\u00e1s sencillos: este ataque funciona ejecutando un proceso malicioso junto a procesos normales utilizando las capacidades de ejecuci\u00f3n de subprocesos paralelos que permite la tecnolog\u00eda HyperThreading. El proceso malintencionado, PortSmash, filtra peque\u00f1as cantidades de datos del proceso objetivo, lo que ayuda a un atacante a reconstruir los datos cifrados procesados \u200b\u200bdentro de \u00e9ste.<\/p>\n<p>Seg\u00fan los investigadores que han descubierto la existencia de PortSmash estamos ante una vulnerabilidad que tiene potencial para afectar a todos los procesadores que utilizan tecnolog\u00eda de subprocesamiento, es decir, a aquellos que son capaces de aprovechar los tiempos de espera de la CPU para ejecutar m\u00faltiples subprocesos. Esto significa, en resumen, que cualquier procesador con tecnolog\u00eda HyperThreading podr\u00eda estar afectado, y tambi\u00e9n las CPUs de AMD con tecnolog\u00eda&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Simultaneous_multithreading\" target=\"_blank\" rel=\"noopener\">SMT<\/a>, aunque de momento los investigadores solo han podido demostrarlo en modelos basados en las arquitecturas Skylake y Kaby Lake.<\/p>\n<p>Billy Brumley, uno de los investigadores responsables del descubrimiento de esta vulnerabilidad, coment\u00f3 que este ataque no tiene nada que ver con la cach\u00e9 ni con la ejecuci\u00f3n especulativa, y aclar\u00f3 que es muy probable que los procesadores de AMD que utilizan la tecnolog\u00eda SMT (Ryzen y derivados) se vean tambi\u00e9n afectados, aunque todav\u00eda no han podido demostrarlo. As\u00ed es como explica este experto las claves fundamentales de esta vulnerabilidad:<i>&#8220;La naturaleza de la fuga se debe al motor de ejecuci\u00f3n compartido en arquitecturas de procesamiento multihilo (por ejemplo, tecnolog\u00eda HyperThreading). Concretamente, detectamos la contenci\u00f3n de puertos para construir un ataque sincronizado de canal lateral con el objetivo de filtrar informaci\u00f3n de procesos que se ejecutan en paralelo en el mismo n\u00facleo f\u00edsico&#8221;.<\/i><\/p>\n<p>Los investigadores han publicado las demostraciones que confirman esta vulnerabilidad en procesadores Intel Skylake y Kaby Lake en&nbsp;<a href=\"https:\/\/github.com\/bbbrumley\/portsmash\" target=\"_blank\" rel=\"noopener\">GitHub<\/a>, y tambi\u00e9n han indicado que el gigante del chip tiene preparado un parche para resolver el problema, aunque su despliegue todav\u00eda no ha comenzado, as\u00ed que desconocemos aspectos tan importantes como su fecha oficial de disponibilidad global y el posible impacto en el rendimiento de los procesadores afectados.<\/p>\n<p>En cuando a los procesadores AMD han especificado que seguir\u00e1n trabajando para confirmar si es cierto o no que est\u00e1n afectados por PortSmash. La tecnolog\u00eda multihilo que permite trabajar con subprocesos en los tiempos de espera de cada proceso que manejan los n\u00facleos f\u00edsicos ha demostrado ser muy \u00fatil, pero no es la primera vez que acaba puesta en duda por problemas de seguridad, basta recordar lo ocurrido con&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/TLBleed\" target=\"_blank\" rel=\"noopener\">TLBleed<\/a>&nbsp;en junio de este mismo a\u00f1o para darse cuenta de ello.<\/p>\n<p>A pesar de todo no creemos que los grandes del sector vayan a renunciar a la tecnolog\u00eda multihilo en sus procesadores de consumo general, HyperThreading en CPUs Intel y SMT en CPUs AMD.<\/p>\n<div>\n<p align=\"right\">Fuente:&nbsp;<a href=\"https:\/\/www.muycomputer.com\/2018\/11\/02\/portsmash-vulnerabilidad-cpus-intel\/\" target=\"_blank\" rel=\"noopener\">muycomputer.com<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Un grupo de investigadores&nbsp;de la Universidad Tecnol\u00f3gica de Tampere, en Finlandia, y la Universidad Tecnol\u00f3gica de la Habana, en Cuba, ha descubierto una nueva vulnerabilidad que afecta a procesadores Intel. Ha sido &#8220;bautizada&#8221; como&nbsp;PortSmash (CVE-2018-5407)&nbsp;y de momento se ha confirmado su presencia en las generaciones Skylake y Kaby Lake, es decir, en los procesadores Core [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":659,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[14],"tags":[],"class_list":["post-141","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vulnerabilidad"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PortSmash: Nueva vulnerabilidad que afecta a CPUs Intel | ETIC Solutions S.A.S<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/etic-solutions.net\/etic\/portsmash\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PortSmash: Nueva vulnerabilidad que afecta a CPUs Intel | ETIC Solutions S.A.S\" \/>\n<meta property=\"og:description\" content=\"Un grupo de investigadores&nbsp;de la Universidad Tecnol\u00f3gica de Tampere, en Finlandia, y la Universidad Tecnol\u00f3gica de la Habana, en Cuba, ha descubierto una nueva vulnerabilidad que afecta a procesadores Intel. 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