{"id":140668,"date":"2025-08-14T11:12:07","date_gmt":"2025-08-14T09:12:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-realizacziyah-protokola-http-2-uproshhayushhaya-provedenie-dos-atak"},"modified":"2025-08-14T11:12:07","modified_gmt":"2025-08-14T09:12:07","slug":"uyazvimost-v-realizacziyah-protokola-http-2-uproshhayushhaya-provedenie-dos-atak","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-realizacziyah-protokola-http-2-uproshhayushhaya-provedenie-dos-atak","title":{"rendered":"Vulnerabilidad en las implementaciones del protocolo HTTP\/2 que facilita la realizaci\u00f3n de ataques DoS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Se ha presentado una nueva t\u00e9cnica de ataque sobre las implementaciones del protocolo HTTP\/2, que simplifica la ejecuci\u00f3n de ataques de denegaci\u00f3n de servicio mediante el agotamiento de los recursos del servidor. La vulnerabilidad ha recibido el nombre en c\u00f3digo MadeYouReset y permite, a trav\u00e9s de manipulaciones de los frames de control de HTTP\/2, inundar al servidor con una gran cantidad de solicitudes eludiendo las restricciones establecidas.     <\/p>\n<p>La esencia del problema es que el cliente puede crear un n\u00famero muy grande de flujos procesados simult\u00e1neamente, independientemente del l\u00edmite SETTINGS_MAX_CONCURRENT_STREAMS, restableciendo cada flujo en la etapa inicial. Este tipo de restablecimiento provoca que, para enviar una nueva solicitud en la conexi\u00f3n HTTP\/2 establecida, el cliente no necesite esperar una respuesta de <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-los-angeles\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3975\">servidores<\/a> y puede enviar inmediatamente un gran flujo continuo de solicitudes, hasta donde lo permita el ancho de banda de la conexi\u00f3n.       <\/p>\n<p>El cliente deja de depender de los retrasos entre el env\u00edo de la solicitud y la recepci\u00f3n de la respuesta (RTT, tiempo de ida y vuelta) y puede llevar a cabo un ataque con costos m\u00ednimos, mientras que el servidor contin\u00faa gastando recursos en el procesamiento de las solicitudes entrantes. Por ejemplo, el servidor realiza la asignaci\u00f3n de estructuras de datos para nuevos flujos, el an\u00e1lisis de la solicitud, la descompresi\u00f3n de encabezados y la coincidencia de URL con el recurso. En un ataque a proxies inversos, el ataque puede propagarse a los backends a los que el proxy logre redirigir la solicitud antes de su restablecimiento.    <\/p>\n<p>La vulnerabilidad recuerda a un problema previamente conocido como Rapid Reset (CVE-2023-44487) y es causada por una discrepancia en la l\u00f3gica de restablecimiento de flujos, definida en la especificaci\u00f3n del protocolo HTTP\/2 y implementada en productos finales. La especificaci\u00f3n prev\u00e9 la posibilidad de que el flujo sea restablecido por el cliente y el servidor en cualquier momento, pero en muchas implementaciones de HTTP\/2,<a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1779\">servidores<\/a> despu\u00e9s de tal restablecimiento, la solicitud contin\u00faa siendo procesada. La principal diferencia del nuevo ataque es que el restablecimiento del procesamiento de la solicitud es llevado a cabo por iniciativa del servidor, y no mediante el env\u00edo por parte del cliente de un frame con la bandera RST_STREAM.     <\/p>\n<p>El reinicio por iniciativa del servidor ocurre al recibir solicitudes incorrectas, pero tales solicitudes se descartan de inmediato sin iniciar su procesamiento completo y sin ser enviadas al backend. Para lograr un ciclo completo de procesamiento de la solicitud, el atacante puede inicialmente enviar una solicitud HTTP correcta, seguida de una secuencia incorrecta de tramas de control HTTP\/2. Esta actividad llevar\u00e1 a que el servidor comience a procesar la solicitud de manera completa, pero luego, debido a un error en el procesamiento de las tramas subsiguientes, reiniciar\u00e1 el flujo (cambiando el flujo con la solicitud correcta al estado RST_STREAM).    <center><img decoding=\"async\" alt=\"Vulnerabilidad en las implementaciones del protocolo HTTP\/2 que facilita la realizaci\u00f3n de ataques DoS\" src=\"\/wp-content\/uploads\/2025\/08\/3d278bdbd71f2845b0b29436ab30e8fb.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Se ha confirmado la existencia del problema en los servidores HTTP Apache Tomcat, Netty, Eclipse Jetty, Fastly, Varnish, Lighttpd y Zephyr RTOS. El problema tambi\u00e9n se manifiesta en los sitios y servicios de servidor de Mozilla. Apache httpd, Apache Traffic Server, Node.js, LiteSpeed y HAProxy no son vulnerables al problema. El estado de la vulnerabilidad en nginx no est\u00e1 determinado.<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63726\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u043d\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 HTTP\/2, \u0443\u043f\u0440\u043e\u0449\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0430\u0442\u0430\u043a \u0434\u043b\u044f \u0432\u044b\u0437\u043e\u0432\u0430 \u043e\u0442\u043a\u0430\u0437\u0430 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f MadeYouReset \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u043c\u0438 \u043a\u0430\u0434\u0440\u0430\u043c\u0438 HTTP\/2 \u043d\u0430\u0432\u043e\u0434\u043d\u0438\u0442\u044c \u0441\u0435\u0440\u0432\u0435\u0440 \u0431\u043e\u043b\u044c\u0448\u0438\u043c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e\u043c \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0432 \u043e\u0431\u0445\u043e\u0434 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043a\u043b\u0438\u0435\u043d\u0442 \u043c\u043e\u0436\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043e\u0447\u0435\u043d\u044c \u0431\u043e\u043b\u044c\u0448\u043e\u0435 \u0447\u0438\u0441\u043b\u043e \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c\u044b\u0445 \u043f\u043e\u0442\u043e\u043a\u043e\u0432, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":140669,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-140668","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=\"\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u043d\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 HTTP\/2, \u0443\u043f\u0440\u043e\u0449\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0430\u0442\u0430\u043a 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