{"id":39289,"date":"2019-10-31T22:29:21","date_gmt":"2019-10-31T19:29:21","guid":{"rendered":"https:\/\/prohoster.info\/blog\/ataka-cpdos-pozvolyayushhaya-sdelat-nedostupnymi-stranitsy-otdavaemye-cherez-cdn\/"},"modified":"2019-10-31T22:29:21","modified_gmt":"2019-10-31T19:29:21","slug":"ataka-cpdos-pozvolyayushhaya-sdelat-nedostupnymi-stranitsy-otdavaemye-cherez-cdn","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/ataka-cpdos-pozvolyayushhaya-sdelat-nedostupnymi-stranitsy-otdavaemye-cherez-cdn","title":{"rendered":"Ataque CPDoS, que permite hacer inaccesibles las p\u00e1ginas servidas a trav\u00e9s de CDN","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Investigadores de las universidades de Hamburgo y Colonia<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/\">desarrollaron<\/a><\/noindex> nuevas t\u00e9cnicas de ataque en redes de entrega de contenido y proxies de cach\u00e9 \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/paper\/Your_Cache_Has_Fallen__Cache_Poisoned_Denial_of_Service_Attack__Preprint_.pdf\">CPDoS<\/a><\/noindex> (Cache-Poisoned Denial-of-Service). El ataque permite lograr la denegaci\u00f3n de acceso a una p\u00e1gina mediante la contaminaci\u00f3n de la cach\u00e9. <\/p>\n<p>El problema est\u00e1 relacionado con el hecho de que los CDN almacenan en cach\u00e9 no solo las solicitudes exitosas, sino tambi\u00e9n las situaciones en las que el servidor http devuelve un error. Por lo general, en caso de problemas para generar solicitudes, el servidor emite un error 400 (Bad Request), siendo la excepci\u00f3n IIS, que devuelve un error 404 (Not Found) para encabezados demasiado grandes. El est\u00e1ndar permite almacenar en cach\u00e9 solo errores con c\u00f3digos 404 (Not Found), 405 (Method Not Allowed), 410 (Gone) y 501 (Not Implemented), pero algunos CDN tambi\u00e9n almacenan en cach\u00e9 respuestas con c\u00f3digo 400 (Bad Request), que depende de la solicitud enviada. <\/p>\n<p>Los atacantes pueden provocar un error de '400 Bad Request' en el recurso original al enviar una solicitud con encabezados HTTP espec\u00edficos. Estos encabezados no son considerados por el CDN, por lo que se almacenar\u00e1 en cach\u00e9 la informaci\u00f3n sobre la imposibilidad de acceder a la p\u00e1gina, y todas las dem\u00e1s solicitudes correctas de los usuarios hasta que expire el tiempo de espera pueden resultar en un error, a pesar de que el sitio original entregue el contenido sin problemas. <\/p>\n<p>Para forzar al servidor HTTP a devolver un error, se han propuesto tres variantes de ataque:  <\/p>\n<ul>\n<li class=\"l\"> HMO (HTTP Method Override) \u2014 un atacante puede sobrescribir el m\u00e9todo de solicitud original a trav\u00e9s de los encabezados 'X-HTTP-Method-Override', 'X-HTTP-Method' o 'X-Method-Override', que son admitidos por algunos servidores, pero no son considerados en el CDN. Por ejemplo, se puede cambiar el m\u00e9todo original 'GET' por el m\u00e9todo 'DELETE' que est\u00e1 prohibido en el servidor o un m\u00e9todo 'POST' que no es aplicable para contenido est\u00e1tico.\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/img\/HMO.png\"><img decoding=\"async\" alt=\"Ataque CPDoS, que permite hacer inaccesibles las p\u00e1ginas servidas a trav\u00e9s de CDN\" src=\"\/wp-content\/uploads\/2019\/10\/6449e613e38cfb3cb1f2f185921214e9.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<li class=\"l\"> HHO (HTTP Header Oversize) \u2014 un atacante puede ajustar el tama\u00f1o del encabezado de manera que supere el l\u00edmite del servidor original, pero no caiga bajo las restricciones del CDN. Por ejemplo, Apache httpd limita el tama\u00f1o del encabezado a 8 KB, mientras que el CDN Amazon Cloudfront permite encabezados de hasta 20 KB;<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/img\/HHO.png\"><img decoding=\"async\" alt=\"Ataque CPDoS, que permite hacer inaccesibles las p\u00e1ginas servidas a trav\u00e9s de CDN\" src=\"\/wp-content\/uploads\/2019\/10\/2bbefaff1f9b5b1b4e568801cd7ac7cd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<li class=\"l\"> HMC (HTTP Meta Character) \u2014 un atacante puede incluir caracteres especiales en la solicitud (\\n, \\r, \\a), los cuales son considerados inv\u00e1lidos en el servidor original, pero son ignorados en el CDN.\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/img\/HMC.png\"><img decoding=\"async\" alt=\"Ataque CPDoS, que permite hacer inaccesibles las p\u00e1ginas servidas a trav\u00e9s de CDN\" src=\"\/wp-content\/uploads\/2019\/10\/5e8426e93a48735796b600db00a5c99d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<\/ul>\n<p>El CDN CloudFront, utilizado en Amazon Web Services (AWS), fue el m\u00e1s afectado por el ataque. Actualmente, la compa\u00f1\u00eda Amazon ya ha solucionado el problema al prohibir el almacenamiento en cach\u00e9 de errores, pero a los investigadores les llev\u00f3 m\u00e1s de tres meses lograr que se implementara una protecci\u00f3n adicional. El problema tambi\u00e9n afect\u00f3 a Cloudflare, Varnish, Akamai, CDN77 y<br \/>\nFastly, pero el ataque a trav\u00e9s de ellos estaba limitado a servidores espec\u00edficos que utilizan IIS, ASP.NET, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pallets\/flask\">Flask<\/a><\/noindex> y <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/playframework\/play1\/issues\/1300\">Play 1<\/a><\/noindex>. <noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/paper\/Your_Cache_Has_Fallen__Cache_Poisoned_Denial_of_Service_Attack__Preprint_.pdf\">Se observa<\/a><\/noindex>, lo que potencialmente podr\u00eda afectar al 11% de los dominios del Departamento de Defensa de EE. UU., el 16% de las URL de la base de datos de HTTP Archive y aproximadamente el 30% de los 500 principales sitios seg\u00fan el ranking de Alexa.<\/p>\n<p>Como m\u00e9todo alternativo para bloquear ataques en el lado del sitio, se puede usar el encabezado 'Cache-Control: no-store', que proh\u00edbe la cach\u00e9 de las respuestas. En algunos CDN, como en<br \/>\n CloudFront y Akamai, se puede desactivar la cach\u00e9 de errores a nivel de configuraci\u00f3n del perfil. Tambi\u00e9n se pueden utilizar firewalls para aplicaciones web (WAF, Web Application Firewall) para protecci\u00f3n, pero deben implementarse en el lado del CDN antes de los hosts que realizan el almacenamiento en cach\u00e9.<\/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=51753\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0413\u0430\u043c\u0431\u0443\u0440\u0433\u0441\u043a\u043e\u0433\u043e \u0438 \u041a\u0451\u043b\u044c\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u043e\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u0430\u0442\u0430\u043a \u043d\u0430 \u0441\u0435\u0442\u0438 \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 \u0438 \u043a\u044d\u0448\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u043a\u0441\u0438 &#8212; CPDoS (Cache-Poisoned Denial-of-Service). \u0410\u0442\u0430\u043a\u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043e\u0442\u043a\u0430\u0437\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0435 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043a\u044d\u0448\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u0442\u0435\u043c, \u0447\u0442\u043e CDN \u043a\u044d\u0448\u0438\u0440\u0443\u044e\u0442 \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u044b, \u043d\u043e \u0438 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438, \u043a\u043e\u0433\u0434\u0430 http-\u0441\u0435\u0440\u0432\u0435\u0440 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u043e\u0448\u0438\u0431\u043a\u0443. \u041a\u0430\u043a \u043f\u0440\u0430\u0432\u0438\u043b\u043e, \u043f\u0440\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0445 \u0441 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":39290,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-39289","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 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