{"id":78381,"date":"2020-04-19T07:42:02","date_gmt":"2020-04-19T05:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-dns-servera-bind-9-11-18-9-16-2-i-9-17-1"},"modified":"2020-04-19T07:42:02","modified_gmt":"2020-04-19T05:42:02","slug":"obnovlenie-dns-servera-bind-9-11-18-9-16-2-i-9-17-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/obnovlenie-dns-servera-bind-9-11-18-9-16-2-i-9-17-1","title":{"rendered":"Actualizaci\u00f3n del servidor DNS BIND 9.11.18, 9.16.2 y 9.17.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Publicado<\/a><\/noindex> actualizaciones correctivas de las ramas estables del servidor DNS BIND 9.11.18 y 9.16.2, as\u00ed como de la rama experimental en desarrollo 9.17.1. En las nuevas versiones se solucion\u00f3<\/a><\/noindex> un problema de seguridad relacionado con la ineficacia de la protecci\u00f3n contra ataques \u00abDNS rebinding<\/a><\/noindex>\u00bb al operar en modo de servidor DNS que redirige solicitudes (bloque \u00abforwarders\u00bb en la configuraci\u00f3n). Adem\u00e1s, se ha trabajado en reducir el tama\u00f1o de la estad\u00edstica de firmas digitales almacenadas en memoria para DNSSEC; el n\u00famero de claves rastreadas se ha reducido a 4 por cada zona, lo que es suficiente en el 99% de los casos.<\/p>\n

La t\u00e9cnica \u00abDNS rebinding\u00bb permite, al abrir una p\u00e1gina espec\u00edfica en el navegador por parte del usuario, establecer una conexi\u00f3n WebSocket con un servicio de red en la red interna, inaccesible para la comunicaci\u00f3n directa a trav\u00e9s de Internet. Para eludir la protecci\u00f3n aplicada en los navegadores contra el acceso fuera de la actual \u00e1rea de dominio (cross-origin), se utiliza el cambio del nombre de host en DNS. En el servidor DNS del atacante se configura la entrega alternada de dos direcciones IP: a la primera solicitud se le devuelve la IP real del servidor con la p\u00e1gina, y a las solicitudes subsiguientes se les devuelve la direcci\u00f3n interna del dispositivo (por ejemplo, 192.168.10.1).<\/p>\n

El tiempo de vida (TTL) para la primera respuesta se establece en el valor m\u00ednimo, por lo que al abrir la p\u00e1gina, el navegador determina la IP real del servidor del atacante y carga el contenido de la p\u00e1gina. En la p\u00e1gina se ejecuta un c\u00f3digo JavaScript que espera a que expire el TTL y env\u00eda una segunda solicitud, que ahora determina el host como 192.168.10.1. Esto permite que desde JavaScript se acceda al servicio dentro de la red local, eludiendo la restricci\u00f3n cross-origin. Protecci\u00f3n<\/a><\/noindex> contra tales ataques en BIND se basa en bloquear el retorno por parte de servidores externos de direcciones IP de la red interna actual o alias CNAME para dominios locales mediante la configuraci\u00f3n deny-answer-addresses y deny-answer-aliases.<\/p>\n

<\/a><\/noindex><\/p>\n

Fuente: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0442\u043e\u043a DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 BIND 9.11.18 \u0438 9.16.2, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0435\u0439\u0441\u044f \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 9.17.1. \u0412 \u043d\u043e\u0432\u044b\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u043d\u0435\u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u044c\u044e \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0430\u0442\u0430\u043a «DNS rebinding» \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u044b DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 (\u0431\u043b\u043e\u043a «forwarders» \u0432 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u0445). \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0430 \u0440\u0430\u0431\u043e\u0442\u0430 \u043f\u043e \u0441\u043e\u043a\u0440\u0430\u0449\u0435\u043d\u0438\u044e \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u0445\u0440\u0430\u043d\u044f\u0449\u0435\u0439\u0441\u044f \u0432 \u043f\u0430\u043c\u044f\u0442\u0438 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 […]<\/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-78381","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Actualizaci\u00f3n del servidor DNS BIND 9.11.18, 9.16.2 y 9.17.1 | ProHoster","description":"Se han publicado actualizaciones correctivas para las ramas estables del servidor DNS BIND 9.11.18 y 9.16.2, as\u00ed 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