{"id":37361,"date":"2019-10-31T22:17:12","date_gmt":"2019-10-31T19:17:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd\/"},"modified":"2019-10-31T22:17:12","modified_gmt":"2019-10-31T19:17:12","slug":"udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"Vulnerabilidad remota de DoS en el stack IPv6 de FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>En FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001908.html\">se solucion\u00f3<\/a><\/noindex> una vulnerabilidad (CVE-2019-5611) que permite causar un fallo en el n\u00facleo (packet-of-death) al enviar paquetes ICMPv6 MLD especialmente fragmentados (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc2710\">Descubrimiento de oyentes multicast<\/a><\/noindex>). El problema <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/BSD\/comments\/c4krwr\/freebsd_ipv6_remote_dingdong_attack_kernel_panic\/\">por un c\u00e1lculo incorrecto del tama\u00f1o de los paquetes L2CAP (protocolo de control de enlace l\u00f3gico y adaptaci\u00f3n), en el caso de que los datos enviados por el remitente superen el tama\u00f1o esperado.<\/a><\/noindex> es la falta de la verificaci\u00f3n necesaria en la llamada a m_pulldown(), lo que puede llevar al regreso de cadenas de mbufs no continuas, en contra de lo esperado por la parte que llama.<\/p>\n<p>Vulnerabilidad <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">se solucion\u00f3<\/a><\/noindex> en las actualizaciones 12.0-RELEASE-p10, 11.3-RELEASE-p3 y 11.2-RELEASE-p14. Como soluci\u00f3n de seguridad, se puede deshabilitar el soporte para la fragmentaci\u00f3n de IPv6 o filtrar en el cortafuegos las opciones en el encabezado <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). Curiosamente, el error que lleva a la vulnerabilidad fue identificado en 2006 y corregido en OpenBSD, NetBSD y macOS, pero permaneci\u00f3 sin arreglar en FreeBSD, a pesar de que los desarrolladores de FreeBSD fueron notificados sobre el problema.<\/p>\n<p>Tambi\u00e9n se puede se\u00f1alar la soluci\u00f3n de otras dos vulnerabilidades en FreeBSD:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001910.html\">CVE-2019-5603<\/a><\/noindex> \u2014 desbordamiento del contador de enlaces en estructuras de datos en mqueuefs al utilizar bibliotecas de 32 bits en un entorno de 64 bits (compatibilidad de 32 bits). El problema se manifiesta al habilitar mqueuefs, que no est\u00e1 activado por defecto, y puede conducir al acceso a archivos, directorios y sockets abiertos por procesos pertenecientes a otros usuarios, o a organizar el acceso a archivos externos desde un entorno jail. Si el usuario tiene acceso root en el jail, la vulnerabilidad permite obtener acceso root en el entorno host.\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001909.html\">CVE-2019-5612<\/a><\/noindex> \u2014 problema de acceso multihilo al dispositivo \/dev\/midistat que, al producirse una condici\u00f3n de carrera, puede resultar en la lectura de \u00e1reas de memoria del n\u00facleo fuera de los l\u00edmites del b\u00fafer asignado a midistat. En sistemas de 32 bits, intentar explotar la vulnerabilidad provoca ca\u00eddas del n\u00facleo, mientras que en sistemas de 64 bits permite obtener el contenido de \u00e1reas arbitrarias de la memoria del n\u00facleo.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fuente: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51332\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-5611), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043a\u0440\u0430\u0445 \u044f\u0434\u0440\u0430 (packet-of-death) \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 ICMPv6 MLD (Multicast Listener Discovery). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0432 \u0432\u044b\u0437\u043e\u0432\u0435 m_pulldown(), \u0447\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0432\u043e\u0437\u0432\u0440\u0430\u0442\u0443 \u043d\u0435 \u043d\u0435\u043f\u0440\u0435\u0440\u044b\u0432\u043d\u044b\u0445 \u0446\u0435\u043f\u043e\u0447\u0435\u043a mbufs, \u0432\u043e\u043f\u0440\u0435\u043a\u0438 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u044f \u0432\u044b\u0437\u044b\u0432\u0430\u044e\u0449\u0435\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 12.0-RELEASE-p10, 11.3-RELEASE-p3 \u0438 11.2-RELEASE-p14. \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u0445\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0443\u0442\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u043c\u043e\u0436\u043d\u043e [&hellip;]<\/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-37361","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 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