{"id":152349,"date":"2025-12-22T17:12:34","date_gmt":"2025-12-22T15:12:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd"},"modified":"2025-12-22T17:12:34","modified_gmt":"2025-12-22T15:12:34","slug":"udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","title":{"rendered":"Vulnerabilidad de root remoto en el manejador de autoconfiguraci\u00f3n de IPv6 en FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Se ha descubierto una vulnerabilidad (CVE-2025-14558) en el proceso en segundo plano rtsold y la utilidad rtsol utilizados en FreeBSD, que permite la ejecuci\u00f3n remota de c\u00f3digo con privilegios de root a trav\u00e9s del env\u00edo de un paquete especialmente dise\u00f1ado con un anuncio de enrutador IPv6. Los mensajes RA (Router Advertisement), a trav\u00e9s de los cuales se explota la vulnerabilidad, no son enrutables y deben ser descartados por los enrutadores. Para llevar a cabo el ataque, un atacante debe tener la capacidad de enviar un paquete especialmente dise\u00f1ado desde un sistema que se encuentre en el mismo segmento de red que el host vulnerable.      <\/p>\n<p>El proceso en segundo plano rtsold se utiliza en hosts para la autoconfiguraci\u00f3n de conexiones a trav\u00e9s de IPv6 utilizando el mecanismo SLAAC (StateLess Address AutoConfiguration). El host env\u00eda un mensaje ICMPv6 RS (Router Solicitation) en modo multicast y espera recibir mensajes RA (Router Advertisement) de los enrutadores, que contienen informaci\u00f3n sobre los prefijos de red y los par\u00e1metros de configuraci\u00f3n. La utilidad rtsol implementa una funcionalidad similar sin iniciar un proceso en segundo plano.      <\/p>\n<p>La vulnerabilidad se debe a que rtsold transmite la lista de \"domain search\" especificada en el mensaje RA a la utilidad resolvconf sin verificar su validez y sin escapar los caracteres especiales. La utilidad resolvconf es un script de shell que no valida los datos de entrada. Para explotar la vulnerabilidad, es suficiente enviar un paquete RA con un nombre <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/domain\/\"   title=\"dominio\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4167\">dominio<\/a>, que contenga caracteres especiales, por ejemplo, \"test`id`test\". La vulnerabilidad ha sido corregida en la actualizaci\u00f3n FreeBSD 15.0-RELEASE-p1, 14.3-RELEASE-p7, 13.5-RELEASE-p8.    <\/p>\n<p>Adem\u00e1s, en las actualizaciones FreeBSD 14.3-RELEASE-p7 y 13.5-RELEASE-p8 (la rama 15.x no est\u00e1 afectada) se ha corregido la vulnerabilidad (CVE-2025-14769) en el filtro de paquetes ipfw, que permite provocar una denegaci\u00f3n de servicio al enviar paquetes especialmente formateados. La vulnerabilidad se manifiesta solo al usar la directiva \"tcp-setmss\" en las reglas de ipfw. El problema es que el manejador de tcp-setmss, bajo ciertas circunstancias, puede liberar la memoria en la que se almacenan los datos recibidos del paquete y devolver un error. Este error fue ignorado por el motor de procesamiento de reglas, lo que permiti\u00f3 que una regla subsiguiente pudiera permitir el paso del paquete, cuyo b\u00fafer de datos ya hab\u00eda sido liberado, lo que lleva a la desreferenciaci\u00f3n de un puntero nulo.<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=64475\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e FreeBSD \u0444\u043e\u043d\u043e\u0432\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 rtsold \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 rtsol \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-14558), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 c \u0430\u043d\u043e\u043d\u0441\u043e\u043c IPv6-\u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430. RA-\u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f (Router Advertisement), \u0447\u0435\u0440\u0435\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043d\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0438\u0440\u0443\u044e\u0442\u0441\u044f \u0438 \u0434\u043e\u043b\u0436\u043d\u044b \u043e\u0442\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0442\u044c\u0441\u044f \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430\u043c\u0438. \u0414\u043b\u044f \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a \u0434\u043e\u043b\u0436\u0435\u043d \u0438\u043c\u0435\u0442\u044c \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 \u0441 \u0441\u0438\u0441\u0442\u0435\u043c\u044b, [&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-152349","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 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e FreeBSD \u0444\u043e\u043d\u043e\u0432\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 rtsold \u0438 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