{"id":81560,"date":"2020-05-14T19:42:19","date_gmt":"2020-05-14T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd"},"modified":"2020-05-14T19:42:19","modified_gmt":"2020-05-14T17:42:19","slug":"udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","title":{"rendered":"Vulnerabilidades explotables remotamente en 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\/2020-May\/thread.html\">se ha solucionado<\/a><\/noindex> se han detectado cinco vulnerabilidades, entre las cuales hay problemas que pueden potencialmente llevar a la sobrescritura de datos a nivel de kernel al enviar ciertos paquetes de red o permiten a un usuario local elevar sus privilegios. Las vulnerabilidades han sido corregidas en las actualizaciones 12.1-RELEASE-p5 y 11.3-RELEASE-p9. <\/p>\n<p>La vulnerabilidad m\u00e1s cr\u00edtica (<noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001950.html\">CVE-2020-7454<\/a><\/noindex>) es causada por la falta de validaci\u00f3n adecuada del tama\u00f1o del paquete en la biblioteca libalias al parsear encabezados espec\u00edficos del protocolo. La biblioteca libalias se utiliza en el filtro de paquetes ipfw para la traducci\u00f3n de direcciones e incluye funciones est\u00e1ndar para el reemplazo de direcciones en paquetes IP y el parseo de protocolos. La vulnerabilidad permite, mediante el env\u00edo de un paquete de red especialmente dise\u00f1ado, leer o escribir datos en \u00e1reas de memoria del kernel (cuando se utiliza la implementaci\u00f3n de NAT en el kernel) o del proceso<br \/>\nnatd (cuando se usa la implementaci\u00f3n de NAT en el espacio de usuario). El problema no afecta a las configuraciones de NAT construidas utilizando filtros de paquetes pf e ipf, as\u00ed como a las configuraciones de ipfw que no utilizan NAT. <\/p>\n<p>Otras vulnerabilidades:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001951.html\">CVE-2020-7455<\/a><\/noindex> \u2014 otra vulnerabilidad explotable de forma remota en libalias, relacionada con el c\u00e1lculo incorrecto de la longitud de los paquetes en el manejador FTP. El problema se limita a la filtraci\u00f3n de algunos bytes de datos de la memoria del n\u00facleo o del proceso natd.\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001953.html\">CVE-2019-15879<\/a><\/noindex> \u2014 vulnerabilidad en el m\u00f3dulo cryptodev, provocada por el acceso a una zona de memoria ya liberada (use-after-free), que permite a un proceso no privilegiado sobrescribir \u00e1reas arbitrarias de la memoria del n\u00facleo. Como soluci\u00f3n para bloquear la vulnerabilidad, se recomienda descargar el m\u00f3dulo cryptodev con el comando \u00abkldunload cryptodev\u00bb, si ha sido cargado (por defecto, cryptodev no se carga). El m\u00f3dulo cryptodev proporciona a las aplicaciones del espacio de usuario acceso a la interfaz \/dev\/crypto para implementar mecanismos de aceleraci\u00f3n hardware en operaciones criptogr\u00e1ficas (en AES-NI y OpenSSL no se utiliza \/dev\/crypto).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001954.html\">CVE-2019-15880<\/a><\/noindex> \u2014 segunda vulnerabilidad en cryptodev que permite a un usuario no privilegiado provocar un bloqueo del n\u00facleo al enviar una solicitud para realizar una operaci\u00f3n criptogr\u00e1fica con un MAC incorrecto. El problema se debe a la falta de verificaci\u00f3n del tama\u00f1o de la clave MAC al asignar un b\u00fafer para su almacenamiento (el b\u00fafer se creaba en funci\u00f3n de los datos de tama\u00f1o proporcionados por el usuario, sin verificar el tama\u00f1o real).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001952.html\">CVE-2019-15878<\/a><\/noindex> \u2014 vulnerabilidad en la implementaci\u00f3n del protocolo SCTP (Stream Control Transmission Protocol), provocada por una verificaci\u00f3n incorrecta de la clave compartida utilizada por la extensi\u00f3n SCTP-AUTH para autenticar las secuencias SCTP. Una aplicaci\u00f3n local puede actualizar la clave a trav\u00e9s de la API de Socket, interrumpiendo al mismo tiempo la conexi\u00f3n SCTP, lo que lleva a un acceso a una \u00e1rea de memoria ya liberada (use-after-free).\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=52948\">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\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0438\u043b\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u044b \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 12.1-RELEASE-p5 \u0438 11.3-RELEASE-p9. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-7454) \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u0434\u043e\u043b\u0436\u043d\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u043f\u0430\u043a\u0435\u0442\u0430 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libalias \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0445 \u0434\u043b\u044f [&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-81560","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e.\" \/>\n\t<meta name=\"robots\" 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