{"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\/sv\/blog\/news\/ataka-cpdos-pozvolyayushhaya-sdelat-nedostupnymi-stranitsy-otdavaemye-cherez-cdn","title":{"rendered":"CPDoS-attack som g\u00f6r sidor som levereras via CDN otillg\u00e4ngliga","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Forskare fr\u00e5n Hamburgs och K\u00f6lns universitet<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/\">har utvecklat<\/a><\/noindex> nya tekniker f\u00f6r attacker p\u00e5 inneh\u00e5llsleveransn\u00e4tverk och cache-proxyer \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). Attacken g\u00f6r det m\u00f6jligt att \u00e5stadkomma avbrott i \u00e5tkomsten till en sida genom att f\u00f6rorena cachen. <\/p>\n<p>Problemet \u00e4r relaterat till att CDN cachelagrar inte bara framg\u00e5ngsrika f\u00f6rfr\u00e5gningar, utan \u00e4ven situationer n\u00e4r http-servern returnerar ett fel. Vanligtvis, vid problem med att formulera f\u00f6rfr\u00e5gningar, ger servern ett fel 400 (Bad Request), med undantag f\u00f6r IIS som ger ett fel 404 (Not Found) f\u00f6r alltf\u00f6r stora rubriker. Standarden till\u00e5ter endast cachelagring av fel med koderna 404 (Not Found), 405 (Method Not Allowed), 410 (Gone) och 501 (Not Implemented), men vissa CDN cachelagrar \u00e4ven svar med kod 400 (Bad Request), som beror p\u00e5 den skickade f\u00f6rfr\u00e5gan. <\/p>\n<p>Angripare kan orsaka ett felmeddelande p\u00e5 den ursprungliga resursen \"400 Bad Request\" genom att skicka en f\u00f6rfr\u00e5gan med specifikt formatterade HTTP-huvuden. Dessa huvuden beaktas inte av CDN, vilket g\u00f6r att det sparas information om att sidan inte kan n\u00e5s och alla korrekta anv\u00e4ndarf\u00f6rfr\u00e5gningar tills timeouten l\u00f6per ut kan leda till ett felmeddelande, trots att den ursprungliga webbplatsen utan problem levererar inneh\u00e5llet. <\/p>\n<p>Tre alternativ f\u00f6r att tvinga HTTP-servern att returnera ett fel har f\u00f6reslagits:  <\/p>\n<ul>\n<li class=\"l\"> HMO (HTTP Method Override) \u2014 angriparen kan \u00e5sidos\u00e4tta den ursprungliga f\u00f6rfr\u00e5gningsmetoden via huvuden \"X-HTTP-Method-Override\", \"X-HTTP-Method\" eller \"X-Method-Override\", som st\u00f6ds av vissa servrar men inte beaktas i CDN. Till exempel kan man byta den ursprungliga metoden \"GET\" till den f\u00f6rbjudna metoden \"DELETE\" p\u00e5 servern, eller en metod \"POST\" som inte \u00e4r till\u00e4mplig f\u00f6r statiskt inneh\u00e5ll;\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/img\/HMO.png\"><img decoding=\"async\" alt=\"CPDoS-attack som g\u00f6r sidor som levereras via CDN otillg\u00e4ngliga\" 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 angriparen kan justera storleken p\u00e5 huvudet p\u00e5 s\u00e5 s\u00e4tt att det \u00f6verstiger gr\u00e4nsen f\u00f6r den ursprungliga servern, men inte omfattas av begr\u00e4nsningarna f\u00f6r CDN. Till exempel, Apache httpd begr\u00e4nsar storleken p\u00e5 huvudet till 8 KB, medan CDN Amazon Cloudfront till\u00e5ter huvuden upp till 20 KB;<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/img\/HHO.png\"><img decoding=\"async\" alt=\"CPDoS-attack som g\u00f6r sidor som levereras via CDN otillg\u00e4ngliga\" 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 angriparen kan infoga specialtecken (\n, \r, \t) i f\u00f6rfr\u00e5gan som anses vara ogiltiga p\u00e5 den ursprungliga servern, men ignoreras i CDN.\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/cpdos.org\/img\/HMC.png\"><img decoding=\"async\" alt=\"CPDoS-attack som g\u00f6r sidor som levereras via CDN otillg\u00e4ngliga\" src=\"\/wp-content\/uploads\/2019\/10\/5e8426e93a48735796b600db00a5c99d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<\/ul>\n<p>Den mest utsatta f\u00f6r attack visade sig vara CDN CloudFront, som anv\u00e4nds av Amazon Web Services (AWS). F\u00f6r n\u00e4rvarande har Amazon redan \u00e5tg\u00e4rdat problemet genom att f\u00f6rbjuda cachen av felmeddelanden, men det tog forskarna mer \u00e4n tre m\u00e5nader att f\u00e5 till st\u00e5nd ett skydd. Problemet drabbade ocks\u00e5 Cloudflare, Varnish, Akamai, CDN77 och<br \/>\nFastly, men attacken via dem \u00e4r begr\u00e4nsad till de m\u00e5ltj\u00e4nser d\u00e4r IIS, ASP.NET anv\u00e4nds, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/pallets\/flask\">Flask<\/a><\/noindex> och <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\">Det noterades<\/a><\/noindex>, vilket inneb\u00e4r att 11% av dom\u00e4nerna i USA:s F\u00f6rsvarsdepartement potentiellt kan vara utsatta f\u00f6r attack, 16% av URL:erna i HTTP Archive-databasen och cirka 30% av de 500 st\u00f6rsta webbplatserna enligt Alexa-rankingen.<\/p>\n<p>Som en metod f\u00f6r att kringg\u00e5 blockeringsattacker p\u00e5 webbplatsens sida kan man anv\u00e4nda headern \"Cache-Control: no-store\", som f\u00f6rhindrar cachning av svar. I vissa CDN, till exempel,<br \/>\n CloudFront och Akamai, kan man st\u00e4nga av cachning av felmeddelanden p\u00e5 profilinst\u00e4llningsniv\u00e5. F\u00f6r skydd kan man ocks\u00e5 anv\u00e4nda webbapplikationsbrandv\u00e4ggar (WAF, Web Application Firewall), men de m\u00e5ste implementeras p\u00e5 CDN-sidan f\u00f6re de hosts som utf\u00f6r cachning.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <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 5.0.4 - aioseo.com -->\n\t<meta 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