{"id":114452,"date":"2024-03-20T12:25:49","date_gmt":"2024-03-20T10:25:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami"},"modified":"2024-03-20T12:25:49","modified_gmt":"2024-03-20T10:25:49","slug":"ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami","title":{"rendered":"Ataque a ciertos protocolos basados en UDP, que provoca un ciclo de intercambio de paquetes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>El Centro de Coordinaci\u00f3n CERT (grupo de respuesta ante emergencias inform\u00e1ticas) ha publicado una advertencia sobre una serie de vulnerabilidades en implementaciones de diversos protocolos de aplicaci\u00f3n que utilizan el protocolo UDP como transporte. Las vulnerabilidades pueden ser explotadas para llevar a cabo ataques de denegaci\u00f3n de servicio debido a la posibilidad de un bucle en el intercambio de paquetes entre dos hosts. Por ejemplo, los atacantes pueden agotar el ancho de banda disponible de la red, interrumpir los servicios en red (por ejemplo, mediante la creaci\u00f3n de una alta carga y el exceso del l\u00edmite de solicitudes) y llevar a cabo amplificadores de tr\u00e1fico para ataques DDoS.     <\/p>\n<p>Entre los protocolos, algunas implementaciones de los cuales son vulnerables, se mencionan DNS, NTP, TFTP, Echo (RFC862), Chargen (RFC864) y QOTD (RFC865). La existencia de una vulnerabilidad (CVE-2024-2169) ha sido confirmada en productos espec\u00edficos de empresas como Cisco, Microsoft, Broadcom, Brother, Honeywell (CVE-2024-1309) y MikroTik. Como medidas de mitigaci\u00f3n para bloquear estas vulnerabilidades, se recomienda habilitar en el firewall el bloqueo de suplantaci\u00f3n (uRPF), limitar el acceso a servicios UDP innecesarios y configurar un l\u00edmite de tasa de tr\u00e1fico (rate-limit y QoS).      <\/p>\n<p>Las vulnerabilidades se deben a la falta de protecci\u00f3n del protocolo UDP contra el spoofing de direcciones \u2014 en ausencia de medidas de protecci\u00f3n contra el spoofing en los enrutadores de tr\u00e1nsito, un atacante puede especificar en un paquete UDP la direcci\u00f3n IP de un servidor arbitrario y enviar ese paquete a otro servidor, que devolver\u00e1 la respuesta a la direcci\u00f3n falsa indicada. El m\u00e9todo de ataque consiste en crear una situaci\u00f3n de bucle de intercambio de paquetes entre servidores que utilizan implementaciones vulnerables del protocolo. Por ejemplo, en respuesta a un paquete recibido, el servidor objetivo puede enviar una respuesta con un c\u00f3digo de error, y el servidor cuya direcci\u00f3n fue falsificada por el atacante devolver\u00e1 su respuesta, que a su vez conllevar\u00e1 el retorno de un paquete con un c\u00f3digo de error. De este modo, <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1893\">servidores<\/a> comenzar\u00e1n a jugar entre s\u00ed los paquetes en \"ping-pong\" indefinidamente.    <center><img decoding=\"async\" alt=\"Ataque a ciertos protocolos basados en UDP, que provoca un ciclo de intercambio de paquetes\" src=\"\/wp-content\/uploads\/2024\/03\/26382437c9cda8b8361fad0167880772.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Es notable que este m\u00e9todo de ataque no es nuevo y en <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-dronten\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2577\">servidor<\/a> La sincronizaci\u00f3n horaria de ntpd ha eliminado una variante de ataque desde 2009 (CVE-2009-3563) en las versiones 4.2.4p8 y 4.2.5. El ataque consist\u00eda en enviar un paquete NTP con una direcci\u00f3n falsa y el flag MODE_PRIVATE activado, lo que hac\u00eda que el servidor objetivo devolviera una respuesta indicando la imposibilidad de utilizar el modo privado, manteniendo el flag MODE_PRIVATE activado en la respuesta. Por consiguiente, otro servidor tampoco pod\u00eda procesar dicho flag y devolv\u00eda su propia respuesta, lo que resultaba en un bucle en el intercambio de paquetes entre dos servidores NTP. Se public\u00f3 una advertencia sobre la posibilidad de llevar a cabo un ataque similar en el protocolo DNS ya en 1996.       <\/p>\n<p>Un escaneo global de direcciones en Internet ha mostrado que actualmente hay al menos 23,000 servidores TFTP vulnerables, 63,000 servidores DNS, 89,000 servidores NTP, 56,000 servicios Echo\/RFC862, 22,000 servicios Chargen\/RFC864 y 21,000 servicios QOTD\/RFC865. Se supone que, en el caso de los servidores NTP, la presencia de vulnerabilidades no corregidas est\u00e1 relacionada con el uso de versiones muy antiguas de ntpd, lanzadas antes de 2010. Los servicios Echo, Chargen y QOTD son inherentemente vulnerables debido a su arquitectura. La situaci\u00f3n con los servidores TFTP y DNS requiere atenci\u00f3n por parte de sus administradores. Los servidores atftpd y tftpd no est\u00e1n expuestos a este problema, ya que utilizan un n\u00famero de puerto de red de origen aleatorio al enviar respuestas. Entre los servidores DNS vulnerables se menciona dproxy-nexgen. En los productos de Microsoft, el problema se manifiesta en WDS (Servicios de Implementaci\u00f3n de Windows), mientras que en productos de Cisco, el problema est\u00e1 presente en los enrutadores de las series 2800 y 2970.<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60814\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043e\u0440\u0434\u0438\u043d\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0439 \u0446\u0435\u043d\u0442\u0440 CERT (\u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u043d\u0430\u044f \u0433\u0440\u0443\u043f\u043f\u0430 \u0440\u0435\u0430\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0430 \u0447\u0440\u0435\u0437\u0432\u044b\u0447\u0430\u0439\u043d\u044b\u0435 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438), \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0435 \u043e \u0441\u0435\u0440\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u043f\u0440\u0438\u043a\u043b\u0430\u0434\u043d\u044b\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0442\u0440\u0430\u043d\u0441\u043f\u043e\u0440\u0442\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b UDP. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0433\u0443\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043e\u0442\u043a\u0430\u0437\u0430 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0438\u0437-\u0437\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u0446\u0438\u043a\u043b\u0438\u0432\u0430\u043d\u0438\u044f \u043e\u0431\u043c\u0435\u043d\u0430 \u043f\u0430\u043a\u0435\u0442\u0430\u043c\u0438 \u043c\u0435\u0436\u0434\u0443 \u0434\u0432\u0443\u043c\u044f \u0445\u043e\u0441\u0442\u0430\u043c\u0438. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0435 \u043c\u043e\u0433\u0443\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u043e\u0439 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u0438 \u0441\u0435\u0442\u0438, \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":114453,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-114452","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=\"\u041a\u043e\u043e\u0440\u0434\u0438\u043d\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0439 \u0446\u0435\u043d\u0442\u0440 CERT (\u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u043d\u0430\u044f \u0433\u0440\u0443\u043f\u043f\u0430 \u0440\u0435\u0430\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0430 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\/>\n\t\t<meta property=\"article:published_time\" content=\"2024-03-20T10:25:49+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-03-20T10:25:49+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Ataque a ciertos protocolos basados en UDP que conduce a un bucle en el intercambio de paquetes | ProHoster","description":"El Centro de Coordinaci\u00f3n CERT (Grupo de Respuesta a Emergencias Inform\u00e1ticas) ha publicado una advertencia sobre una serie de vulnerabilidades en las implementaciones de varios protocolos de aplicaci\u00f3n que utilizan como transporte.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"es_ES","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0410\u0442\u0430\u043a\u0430 \u043d\u0430 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 UDP, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a 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