{"id":82460,"date":"2020-05-21T19:42:00","date_gmt":"2020-05-21T17:42:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ataka-nxnsattack-zatragivayushhaya-vse-dns-rezolvery"},"modified":"2020-05-21T19:42:00","modified_gmt":"2020-05-21T17:42:00","slug":"ataka-nxnsattack-zatragivayushhaya-vse-dns-rezolvery","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/ataka-nxnsattack-zatragivayushhaya-vse-dns-rezolvery","title":{"rendered":"Ataque NXNSAttack, que afecta a todos los resolutores DNS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Un grupo de investigadores de la Universidad de Tel Aviv y del Centro Interdisciplinario de Herzl\u00eda (Israel) <noindex><a rel=\"nofollow\" href=\"https:\/\/en.blog.nic.cz\/2020\/05\/19\/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack\/\">desarroll\u00f3<\/a><\/noindex> un nuevo m\u00e9todo de ataque <noindex><a rel=\"nofollow\" href=\"http:\/\/www.nxnsattack.com\/\">NXNSAttack<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"http:\/\/www.nxnsattack.com\/dns-ns-paper.pdf\">PDF<\/a><\/noindex>), que permite utilizar cualquier resolutor DNS como amplificadores de tr\u00e1fico, proporcionando un grado de amplificaci\u00f3n de hasta 1621 veces en n\u00famero de paquetes (por cada solicitud enviada al resolutor, se puede lograr el env\u00edo de 1621 solicitudes al servidor de la v\u00edctima) y hasta 163 veces en tr\u00e1fico. <\/p>\n<p>El problema est\u00e1 relacionado con las caracter\u00edsticas del protocolo y afecta a todos los servidores DNS que soportan el procesamiento recursivo de solicitudes, incluyendo <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/bind-announce@lists.isc.org\/msg00571.html\">BIND<\/a><\/noindex> (CVE-2020-8616), <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2020\/05\/19\/2\">Knot<\/a><\/noindex> (CVE-2020-12667), <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2020\/05\/19\/3\">PowerDNS<\/a><\/noindex> (CVE-2020-10995), <noindex><a rel=\"nofollow\" href=\"https:\/\/portal.msrc.microsoft.com\/en-us\/security-guidance\/advisory\/ADV200009\">Windows DNS Server<\/a><\/noindex> y <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2020\/05\/19\/5\">Unbound<\/a><\/noindex> (CVE-2020-12662), as\u00ed como a los servicios DNS p\u00fablicos de Google, Cloudflare, Amazon, Quad9, ICANN y otras compa\u00f1\u00edas. La correcci\u00f3n del problema fue coordinada con los desarrolladores de servidores DNS, quienes lanzaron simult\u00e1neamente actualizaciones que solucionaban la vulnerabilidad en sus productos. La protecci\u00f3n contra el ataque se implement\u00f3 en las versiones<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/nlnetlabs.nl\/news\/2020\/May\/19\/unbound-1.10.1-released\/\">Unbound 1.10.1<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.knot-resolver.cz\/2020-05-19-knot-resolver-5.1.1.html\">Knot Resolver 5.1.1<\/a><\/noindex>,  <noindex><a rel=\"nofollow\" href=\"https:\/\/downloads.powerdns.com\/releases\">PowerDNS Recursor 4.3.1, 4.2.2, 4.1.16<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/bind-announce@lists.isc.org\/msg00573.html\">BIND 9.11.19, 9.14.12, 9.16.3<\/a><\/noindex>.<\/p>\n<p>El ataque se basa en el uso de solicitudes del atacante que hacen referencia a un gran n\u00famero de registros NS ficticios que nunca se hab\u00edan encontrado anteriormente, a los que se les delega la resoluci\u00f3n de nombres, pero sin incluir en la respuesta registros glue con informaci\u00f3n sobre las direcciones IP de los servidores NS. Por ejemplo, el atacante env\u00eda una solicitud para resolver el nombre sd1.attacker.com, controlando el servidor DNS responsable del dominio attacker.com. En respuesta a la consulta del resolutor al servidor DNS del atacante, se proporciona una respuesta que delega la resoluci\u00f3n de la direcci\u00f3n sd1.attacker.com al servidor DNS de la v\u00edctima a trav\u00e9s de la indicaci\u00f3n en la respuesta de los registros NS sin detallar las IP de los servidores NS. Dado que el mencionado servidor NS no se hab\u00eda encontrado anteriormente y su direcci\u00f3n IP no est\u00e1 especificada, el resolutor intenta determinar la direcci\u00f3n IP del servidor NS enviando una solicitud al servidor DNS de la v\u00edctima que atiende el dominio objetivo (victim.com).<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"http:\/\/www.nxnsattack.com\/dns-ns-paper.pdf\"><img decoding=\"async\" alt=\"Ataque NXNSAttack, que afecta a todos los resolutores DNS\" src=\"\/wp-content\/uploads\/2020\/05\/d56af64ec0f47b2673bd6ff5869e1087.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>El problema es que el atacante puede devolver una enorme lista de servidores NS \u00fanicos con nombres de subdominios ficticios que no existen (fake-1.victim.com, fake-2.victim.com,... fake-1000.victim.com). El resolvedor intentar\u00e1 enviar una consulta al servidor DNS de la v\u00edctima, pero recibir\u00e1 una respuesta de que el dominio no se encuentra, tras lo cual intentar\u00e1 identificar el siguiente servidor NS en la lista y as\u00ed sucesivamente, hasta que haya agotado todos los registros NS enumerados por el atacante. En consecuencia, por cada consulta del atacante, el resolvedor enviar\u00e1 una enorme cantidad de solicitudes para determinar los hosts NS. Dado que los nombres de los servidores NS se generan aleatoriamente y hacen referencia a subdominios que no existen, no se extraen de la cach\u00e9 y cada consulta del atacante genera una avalancha de solicitudes al servidor DNS que gestiona el dominio de la v\u00edctima.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/en.blog.nic.cz\/2020\/05\/19\/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack\/\"><img decoding=\"async\" alt=\"Ataque NXNSAttack, que afecta a todos los resolutores DNS\" src=\"\/wp-content\/uploads\/2020\/05\/9a1ca424c949d7732ce361560ff71e0c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Los investigadores han estudiado el grado de vulnerabilidad de los resolvedores DNS p\u00fablicos y han determinado que al enviar consultas al resolvedor de CloudFlare (1.1.1.1) se puede lograr una amplificaci\u00f3n de paquetes (PAF, Packet Amplification Factor) de 48 veces, Google (8.8.8.8) \u2014 30 veces, FreeDNS (37.235.1.174) \u2014 50 veces, OpenDNS (208.67.222.222) \u2014 32 veces. Se observan cifras m\u00e1s notables para<br \/>\nLevel3 (209.244.0.3) \u2014 273 veces, Quad9 (9.9.9.9) \u2014 415 veces.<br \/>\nSafeDNS (195.46.39.39) \u2014 274 veces, Verisign (64.6.64.6) \u2014 202 veces,<br \/>\nUltra (156.154.71.1) \u2014 405 veces, Comodo Secure (8.26.56.26) \u2014 435 veces, DNS.Watch (84.200.69.80) \u2014 486 veces, y Norton ConnectSafe (199.85.126.10) \u2014 569 veces. Para servidores basados en BIND 9.12.3, mediante la paralelizaci\u00f3n de las consultas, el nivel de amplificaci\u00f3n puede alcanzar hasta 1000. En Knot Resolver 5.1.0, el nivel de amplificaci\u00f3n es de aproximadamente unas pocas decenas de veces (24-48), ya que la determinaci\u00f3n de los nombres NS se realiza secuencialmente y se encuentra con una limitaci\u00f3n interna en el n\u00famero de pasos de resoluci\u00f3n de nombres permitidos para una sola consulta.<\/p>\n<p>Se destacan dos estrategias principales de protecci\u00f3n. Para sistemas con DNSSEC <noindex><a rel=\"nofollow\" href=\"https:\/\/en.blog.nic.cz\/2020\/05\/19\/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack\/\">activar<\/a><\/noindex> utilizar <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc8198\">RFC-8198<\/a><\/noindex> para prevenir el elusi\u00f3n de cach\u00e9 DNS, ya que las consultas se env\u00edan con nombres aleatorios. La esencia del m\u00e9todo es generar respuestas negativas sin recurrir a servidores DNS autoritativos, empleando una verificaci\u00f3n por rangos a trav\u00e9s de DNSSEC. Un m\u00e9todo m\u00e1s simple es limitar la cantidad de nombres que se pueden resolver al procesar una sola consulta delegada, pero este m\u00e9todo puede causar problemas con algunas configuraciones existentes, ya que los l\u00edmites no est\u00e1n definidos en el protocolo.<\/p>\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=52995\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0422\u0435\u043b\u044c-\u0410\u0432\u0438\u0432\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0438 \u041c\u0435\u0436\u0434\u0438\u0441\u0446\u0438\u043f\u043b\u0438\u043d\u0430\u0440\u043d\u043e\u0433\u043e \u0446\u0435\u043d\u0442\u0440\u0430 \u0432 \u0413\u0435\u0440\u0446\u043b\u0438\u0438 (\u0418\u0437\u0440\u0430\u0438\u043b\u044c) \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 NXNSAttack (PDF), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043b\u044e\u0431\u044b\u0435 DNS-\u0440\u0435\u0437\u043e\u043b\u0432\u0435\u0440\u044b \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0443\u0441\u0438\u043b\u0438\u0442\u0435\u043b\u0435\u0439 \u0442\u0440\u0430\u0444\u0438\u043a\u0430, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0441\u0442\u0435\u043f\u0435\u043d\u044c \u0443\u0441\u0438\u043b\u0435\u043d\u0438\u044f \u0434\u043e 1621 \u0440\u0430\u0437 \u043f\u043e \u0447\u0438\u0441\u043b\u0443 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 (\u043d\u0430 \u043a\u0430\u0436\u0434\u044b\u0439 \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0439 \u043a \u0440\u0435\u0437\u043e\u043b\u0432\u0435\u0440\u0443 \u0437\u0430\u043f\u0440\u043e\u0441, \u043c\u043e\u0436\u043d\u043e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440 \u0436\u0435\u0440\u0442\u0432\u044b 1621 \u0437\u0430\u043f\u0440\u043e\u0441) \u0438 \u0434\u043e 163 \u0440\u0430\u0437 \u043f\u043e \u0442\u0440\u0430\u0444\u0438\u043a\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":82461,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-82460","post","type-post","status-publish","format-standard","has-post-thumbnail","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=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0422\u0435\u043b\u044c-\u0410\u0432\u0438\u0432\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0438 \u041c\u0435\u0436\u0434\u0438\u0441\u0446\u0438\u043f\u043b\u0438\u043d\u0430\u0440\u043d\u043e\u0433\u043e \u0446\u0435\u043d\u0442\u0440\u0430 \u0432 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