{"id":6044,"date":"2016-08-17T15:52:45","date_gmt":"2016-08-17T13:52:45","guid":{"rendered":"https:\/\/test-blog.mailfence.com\/?p=6044"},"modified":"2024-06-04T17:00:59","modified_gmt":"2024-06-04T15:00:59","slug":"vulnerabilidad-de-tcp-en-gnu-linux-mailfence","status":"publish","type":"post","link":"https:\/\/blog.mailfence.com\/es\/vulnerabilidad-de-tcp-en-gnu-linux-mailfence\/","title":{"rendered":"La Vulnerabilidad de TCP en GNU\/Linux no afecta a Mailfence"},"content":{"rendered":"<p>Recientemente, un <a href=\"http:\/\/www.theregister.co.uk\/2016\/08\/10\/linux_tor_users_open_corrupted_communications\/\">equipo de investigadores de seguridad de los EE. UU.<\/a> han hecho p\u00fablica una vulnerabilidad de TCP en GNU\/Linux (<a href=\"https:\/\/web.nvd.nist.gov\/view\/vuln\/detail?vulnId=CVE-2016-5696\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2016-5696<\/a>). Despu\u00e9s de analizarlo, hemos concluido que el error no representa una amenaza para nuestros usuarios. Sin embargo, durante la semana pasada hemos implementado medidas suplementarias para consolidar a\u00fan m\u00e1s los servidores de Mailfence.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-14236 size-full\" title=\"Escudo Vulnerabilidad de TCP en GNU\/Linux\" src=\"https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/06\/security-es-image-12.png\" alt=\"\" width=\"410\" height=\"231\" srcset=\"https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/06\/security-es-image-12.png 410w, https:\/\/blog.mailfence.com\/wp-content\/uploads\/2018\/06\/security-es-image-12-300x169.png 300w\" sizes=\"auto, (max-width: 410px) 100vw, 410px\" \/><\/p>\n<h3>Vulnerabilidad de TCP en GNU\/Linux<\/h3>\n<p>La vulnerabilidad de TCP descubierta ha estado presente en el kernel de GNU\/Linux desde 2012. Esta requiere que un atacante tenga las direcciones IP tanto del cliente como del servidor. Debido al l\u00edmite de tasas que aplica el kernel de GNU\/Linux a los paquetes de \u00abchallege ACK\u00bb, es posible piratear la conexi\u00f3n TCP entre cliente y servidor. Esto permitir\u00eda (por ejemplo) que un atacante inyectase c\u00f3digo\/datos malintencionados en la retransmisi\u00f3n (streaming) de la comunicaci\u00f3n HTTP.<\/p>\n<p>Esta vulnerabilidad puede explotarse sin necesidad de tener funcionalidades de \u00ab<a href=\"https:\/\/blog.mailfence.com\/es\/amenazas-para-la-privacidad-en-internet-y-la-seguridad-digital\/\">intermediario<\/a>\u00bb (<a href=\"https:\/\/es.wikipedia.org\/wiki\/Ataque_de_intermediario\">MiTM<\/a>) As\u00ed, es posible ejecutar el ataque \u00abfuera del camino\u00bb sin tener la capacidad de espiar directamente en la red entre cliente y servidor.&nbsp; Esto reduce significativamente la dificultad del ataque. Es posible encontrar m\u00e1s informaci\u00f3n en <a href=\"http:\/\/www.cs.ucr.edu\/~zhiyunq\/pub\/sec16_TCP_pure_offpath.pdf\">el documento de la investigaci\u00f3n<\/a>.<\/p>\n<h3>Protecci\u00f3n para nuestros usuarios<\/h3>\n<p>Si bien la vulnerabilidad de TCP puede sonar grave, su impacto resulta limitado en la pr\u00e1ctica para los usuarios conectados a nuestros servidores. En el peor caso posible, las conexiones TCP arbitrarias podr\u00edan cerrarse te\u00f3ricamente, de modo que no ser\u00eda posible piratearlas debido al uso del cifrado por <a href=\"https:\/\/es.wikipedia.org\/wiki\/Transport_Layer_Security\">TLS<\/a>. Espec\u00edficamente en el caso de las sesiones web, nuestra pol\u00edtica <a href=\"https:\/\/es.wikipedia.org\/wiki\/HTTP_Strict_Transport_Security\">HSTS<\/a> garantiza que el HTTPS (en vez del HTTP) se use desde el primer momento.<\/p>\n<p>Adem\u00e1s, para ofrecer a nuestros usuarios una protecci\u00f3n a\u00fan mayor contra esta posibilidad (similar a los ataques <a href=\"https:\/\/es.wikipedia.org\/wiki\/Ataque_de_denegaci%C3%B3n_de_servicio\">DoS<\/a>), nuestro equipo de seguridad ya ha tomado las medidas necesarias sin esperar a que se publiquen los nuevos paquetes para el kernel.<\/p>\n<p>[maxbutton id=\u00bb30&#8243;]<\/p>\n<p>Mailfence es un servicio de webmail&nbsp;<a href=\"https:\/\/mailfence.com\/es\/e-mail-seguro.jsp\">seguro<\/a> y <a href=\"https:\/\/mailfence.com\/es\/e-mail-privado.jsp\">privado<\/a> . S\u00edganos en <a href=\"https:\/\/twitter.com\/mailfence\" target=\"_blank\" rel=\"noopener noreferrer\">twitter<\/a>\/<a href=\"https:\/\/www.reddit.com\/r\/mailfence\" target=\"_blank\" rel=\"noopener noreferrer\">reddit<\/a> y mant\u00e9ngase al d\u00eda en todo momento.<\/p>\n<p>\u2013 El Equipo Mailfence<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recientemente, un equipo de investigadores de seguridad de los EE. UU. han hecho p\u00fablica una vulnerabilidad de TCP en GNU\/Linux (CVE-2016-5696). Despu\u00e9s de analizarlo, hemos concluido que el error no representa una amenaza para nuestros usuarios. Sin embargo, durante la semana pasada hemos implementado medidas suplementarias para consolidar a\u00fan m\u00e1s los servidores de Mailfence. Vulnerabilidad [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":85934,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[857],"tags":[],"class_list":["post-6044","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seguridad"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La Vulnerabilidad de TCP en GNU\/Linux no afecta a Mailfence<\/title>\n<meta name=\"description\" content=\"Recientemente, una vulnerabilidad de TCP en GNU\/Linux fue publicada por investigadores en los EE. 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