{"id":120072,"date":"2024-10-07T13:09:25","date_gmt":"2024-10-07T11:09:25","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah"},"modified":"2024-10-07T13:09:25","modified_gmt":"2024-10-07T11:09:25","slug":"uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah","title":{"rendered":"Una vulnerabilidad en CUPS ha demostrado ser \u00fatil para amplificar el tr\u00e1fico durante ataques DDoS.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>El grupo responsable de la seguridad de la red de entrega de contenido de Akamai ha identificado un vector de ataque adicional en el proceso cups-browsed, adem\u00e1s de su uso como uno de los eslabones en un exploit que conduce a la ejecuci\u00f3n de c\u00f3digo en el sistema. A trav\u00e9s del env\u00edo de solicitudes al proceso cups-browsed, que acepta conexiones sin restricciones en el puerto 631, se puede lograr el env\u00edo de datos a otro host, cuyo tama\u00f1o puede superar la solicitud original hasta 600 veces. Para comparaci\u00f3n, el factor de amplificaci\u00f3n para memcached puede alcanzar de 10 a 50 mil veces, NTP \u2014 556 veces, DNS \u2014 28-54, RIPv2 \u2014 21, SNMPv2 \u2014 6.       <\/p>\n<p>Esta caracter\u00edstica permite utilizar sistemas con cups-browsed como amplificadores de tr\u00e1fico durante la realizaci\u00f3n de ataques DDoS. El m\u00e9todo de ataque utilizando amplificadores de tr\u00e1fico se basa en que las solicitudes de las computadoras involucradas en el ataque DDoS no se dirigen directamente al sistema objetivo, sino a trav\u00e9s de un amplificador de tr\u00e1fico intermedio. Durante el escaneo de la red, se identificaron m\u00e1s de 198 mil sistemas vulnerables con CUPS, de los cuales el 34% (58 mil sistemas) resultaron ser aptos para amplificar el tr\u00e1fico en un ataque DDoS.        <\/p>\n<p>A diferencia de los m\u00e9todos de amplificaci\u00f3n de tr\u00e1fico que requieren el env\u00edo de paquetes UDP con una direcci\u00f3n de retorno falsificada de la v\u00edctima, el uso de cups-browsed permite prescindir de la suplantaci\u00f3n. El servicio cups-browsed tiene la capacidad incorporada de cargar un archivo PPD desde un origen arbitrario <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=\"3940\">servidores<\/a> en respuesta a una solicitud externa no autorizada, durante la cual el cliente env\u00eda una URL y cups-browsed intenta cargar el archivo PPD desde el servidor indicado.     <\/p>\n<p>Al enviar una solicitud para cargar un archivo PPD en cups-browsed, se puede conseguir la adici\u00f3n de un relleno adicional al valor \u00abIPP URI\u00bb, que puede alcanzar hasta 989 bytes. En este caso, en la llamada iniciada en cups-browsed, el valor \u00abIPP URI\u00bb se duplica \u2014 una vez en el encabezado HTTP, y otra vez dentro del cuerpo de la solicitud POST, y las solicitudes se repiten c\u00edclicamente despu\u00e9s de intentos fallidos de carga y retorno. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-prohoster\/\"   title=\"el servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3092\">el servidor<\/a> del c\u00f3digo de error 404.    <\/p>\n<p>En el 62% (35900) de los sistemas verificados, cups-browsed envi\u00f3 al menos 10 solicitudes TCP\/IPP\/HTTP a la sistema objetivo en respuesta a una sola solicitud UDP de origen. En promedio, para 58000 sistemas afectados, el n\u00famero de solicitudes repetidas fue de 45. En un escenario \u00f3ptimo, el env\u00edo de una solicitud de 30 bytes con 45 reintentos resultar\u00eda en el env\u00edo de 18000 bytes de datos al sistema objetivo, es decir, se observar\u00eda un aumento del tr\u00e1fico de 600 veces. En el peor de los casos, el aumento es de 108 veces.      <\/p>\n<p>Tambi\u00e9n se puede mencionar el reflejo por parte de la empresa Cloudflare de un ataque DDoS r\u00e9cord, en el que se dirigi\u00f3 un flujo de 3.8 terabits por segundo (2.14 mil millones de paquetes por segundo) hacia el sistema de la v\u00edctima. Se destaca que el ataque fue organizado utilizando un gran n\u00famero de enrutadores dom\u00e9sticos comprometidos de Asus y Mikrotik, as\u00ed como dispositivos DVR y servidores web, hackeados entre otras cosas con vulnerabilidades relativamente recientes.<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=62008\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430, \u043e\u0442\u0432\u0435\u0447\u0430\u044e\u0449\u0430\u044f \u0437\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c \u0441\u0435\u0442\u0438 \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 Akamai, \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u0435\u043a\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 cups-browsed, \u043f\u043e\u043c\u0438\u043c\u043e \u0435\u0433\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u0437 \u0437\u0432\u0435\u043d\u044c\u0435\u0432 \u0432 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0435, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u043c \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0427\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043a \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0443 cups-browsed, \u0431\u0435\u0437 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u044e\u0449\u0435\u043c\u0443 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u043d\u0430 631 \u043f\u043e\u0440\u0442\u0443, \u043c\u043e\u0436\u043d\u043e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0434\u0440\u0443\u0433\u043e\u0439 \u0445\u043e\u0441\u0442, \u0440\u0430\u0437\u043c\u0435\u0440 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0435\u0432\u044b\u0448\u0430\u0442\u044c [&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-120072","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=\"\u0413\u0440\u0443\u043f\u043f\u0430, \u043e\u0442\u0432\u0435\u0447\u0430\u044e\u0449\u0430\u044f \u0437\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c \u0441\u0435\u0442\u0438 \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 Akamai, \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u0435\u043a\u0442\u043e\u0440 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amplificar el tr\u00e1fico durante ataques DDoS | ProHoster","description":"El grupo responsable de la seguridad de la red de entrega de contenido Akamai identific\u00f3 un vector de ataque adicional en el proceso cups-browsed, adem\u00e1s de su uso como uno de los eslabones en el exploit que conduce a.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c 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