{"id":82929,"date":"2020-05-26T19:42:01","date_gmt":"2020-05-26T17:42:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/rangeamp-seriya-atak-na-cdn-manipuliruyushhaya-http-zagolovkom-range"},"modified":"2020-05-26T19:42:01","modified_gmt":"2020-05-26T17:42:01","slug":"rangeamp-seriya-atak-na-cdn-manipuliruyushhaya-http-zagolovkom-range","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/rangeamp-seriya-atak-na-cdn-manipuliruyushhaya-http-zagolovkom-range","title":{"rendered":"RangeAmp \u2014 t\u00e1mad\u00e1sok sorozata a CDN-en, amely manipul\u00e1lja a HTTP Range fejl\u00e9cet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Peking Egyetem, Qinghua Egyetem \u00e9s a Dallas-i Texas Egyetem kutat\u00f3csoportja <noindex><a rel=\"nofollow\" href=\"https:\/\/www.liubaojun.org\/uploads\/1\/1\/8\/3\/118316462\/dsn_2020.pdf\">felt\u00e1rta<\/a><\/noindex> \u00daj DoS-t\u00e1mad\u00e1si oszt\u00e1ly &#8212; RangeAmp, amely az HTTP-fejl\u00e9c felhaszn\u00e1l\u00e1s\u00e1n alapul <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc7233\">Tartom\u00e1ny<\/a><\/noindex> a tartalomszolg\u00e1ltat\u00f3 h\u00e1l\u00f3zatokon (CDN) t\u00f6rt\u00e9n\u0151 forgalomfokoz\u00e1s megszervez\u00e9s\u00e9hez. A m\u00f3dszer l\u00e9nyege, hogy a Range-fejl\u00e9cek feldolgoz\u00e1s\u00e1nak saj\u00e1toss\u00e1gai miatt sok CDN-n\u00e9l a t\u00e1mad\u00f3 egy b\u00e1jt adhat meg egy nagy f\u00e1jlhoz, de a CDN teljes f\u00e1jlt vagy jelent\u0151sen nagyobb adatblokkokat t\u00f6lt le a c\u00e9lkiszolg\u00e1l\u00f3r\u00f3l a gyors\u00edt\u00f3t\u00e1rhoz. Az ezen a t\u00e1mad\u00e1son \u00e1tfoly\u00f3 forgalom fokoz\u00f3d\u00e1s\u00e1nak m\u00e9rt\u00e9ke a CDN-t\u0151l f\u00fcgg\u0151en 724 \u00e9s 43330 k\u00f6z\u00f6tt v\u00e1ltozik, ami felhaszn\u00e1lhat\u00f3 egy CDN t\u00falterhel\u00e9s\u00e9re vagy a c\u00e9loldal s\u00e1vsz\u00e9less\u00e9g\u00e9nek cs\u00f6kkent\u00e9s\u00e9re.<\/p>\n<p><center><img decoding=\"async\" alt=\"RangeAmp - a CDN-eket c\u00e9lz\u00f3 t\u00e1mad\u00e1sok sorozata, amely manipul\u00e1lja a Range HTTP fejl\u00e9cet\" src=\"\/wp-content\/uploads\/2020\/05\/45a7b48e01885f8ae50c3549e3293b12.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>A Range-fejl\u00e9c lehet\u0151s\u00e9get ad a kliensnek, hogy meghat\u00e1rozza a f\u00e1jl azon poz\u00edci\u00f3tartom\u00e1nyait, amelyeket le szeretne t\u00f6lteni a teljes f\u00e1jl helyett. P\u00e9ld\u00e1ul a kliens megadhatja a &#171;Range: bytes=0-1023&#187; \u00e9rt\u00e9ket, \u00e9s a szerver csak az els\u0151 1024 b\u00e1jtot fogja \u00e1tadni. Ez a lehet\u0151s\u00e9g k\u00fcl\u00f6n\u00f6sen nagy f\u00e1jlok let\u00f6lt\u00e9sekor hasznos &#8212; a felhaszn\u00e1l\u00f3 meg\u00e1ll\u00edthatja a let\u00f6lt\u00e9st, majd folytathatja azt a megszak\u00edtott poz\u00edci\u00f3b\u00f3l. A &#171;bytes=0-0&#187; megad\u00e1sakor a szabv\u00e1ny el\u0151\u00edrja, hogy az els\u0151 b\u00e1jtot kell \u00e1tadni, a &#171;bytes=-1&#187; pedig az utols\u00f3t, a &#171;bytes=1-&#187; pedig az 1. b\u00e1jt\u00f3l a f\u00e1jl v\u00e9g\u00e9ig. Lehet\u0151v\u00e9 tehet\u0151 t\u00f6bb tartom\u00e1ny \u00e1tvitele egy fejl\u00e9cben, p\u00e9ld\u00e1ul &#171;Range: bytes=0-1023,8192-10240&#187;.<\/p>\n<p>Egy m\u00e1sodik t\u00e1mad\u00e1si lehet\u0151s\u00e9get is javasoltak, amely a h\u00e1l\u00f3zati terhel\u00e9s n\u00f6vel\u00e9s\u00e9re ir\u00e1nyul, amikor a forgalmat egy m\u00e1sik CDN-en kereszt\u00fcl ir\u00e1ny\u00edtj\u00e1k, amely proxyk\u00e9nt m\u0171k\u00f6dik (p\u00e9ld\u00e1ul amikor a Cloudflare m\u0171k\u00f6dik front-endk\u00e9nt (FCDN), m\u00edg a b\u00e1zis CDN (BCDN) az Akamai). Ez a m\u00f3dszer hasonl\u00edt az els\u0151 t\u00e1mad\u00e1shoz, de a CDN-h\u00e1l\u00f3zatokon bel\u00fcl lokaliz\u00e1l\u00f3dik, \u00e9s lehet\u0151v\u00e9 teszi a forgalom feler\u0151s\u00edt\u00e9s\u00e9t m\u00e1s CDN-eken kereszt\u00fcl, fokozva ezzel az infrastrukt\u00far\u00e1ra nehezed\u0151 terhel\u00e9st \u00e9s cs\u00f6kkentve a szolg\u00e1ltat\u00e1s min\u0151s\u00e9g\u00e9t.  <\/p>\n<p>Az elk\u00e9pzel\u00e9s az, hogy a t\u00e1mad\u00f3 Range-k\u00e9r\u00e9seket ir\u00e1ny\u00edt a CDN-hez t\u00f6bb tartom\u00e1ny sz\u00e1m\u00e1ra, p\u00e9ld\u00e1ul &#171;bytes=0-,0-,0-&#8230;&#187;, &#171;bytes=1-,0-,0-&#8230;&#187; vagy &#171;bytes=-1024,0-,0-&#8230;&#187;. A k\u00e9r\u00e9sek sz\u00e1mos &#171;0-&#171; tartom\u00e1nyt tartalmaznak, amelyek azt jelentik, hogy a f\u00e1jlt a nulladik poz\u00edci\u00f3t\u00f3l a v\u00e9g\u00e9ig le kell adni. A tartom\u00e1nyok helytelen feldolgoz\u00e1sa miatt, amikor az els\u0151 CDN a m\u00e1sodikhoz ir\u00e1ny\u00edt, minden &#171;0-&#187; tartom\u00e1nyra a teljes f\u00e1jlt adj\u00e1k \u00e1t (a tartom\u00e1nyok nem aggreg\u00e1l\u00f3dnak, hanem sorrendben kezel\u0151dnek), ha az eredetileg elk\u00fcld\u00f6tt t\u00e1mad\u00f3i k\u00e9r\u00e9sben duplik\u00e1ci\u00f3 \u00e9s \u00e1tfed\u00e9s van a tartom\u00e1nyok k\u00f6z\u00f6tt. A forgalom feler\u0151s\u00edt\u00e9s\u00e9nek m\u00e9rt\u00e9ke ebben a t\u00e1mad\u00e1sban 53 \u00e9s 7432 k\u00f6z\u00f6tt mozog.<\/p>\n<p><center><img decoding=\"async\" alt=\"RangeAmp - a CDN-eket c\u00e9lz\u00f3 t\u00e1mad\u00e1sok sorozata, amely manipul\u00e1lja a Range HTTP fejl\u00e9cet\" src=\"\/wp-content\/uploads\/2020\/05\/981161394221a0548a04ec5961081c27.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>A kutat\u00e1s sor\u00e1n 13 CDN viselked\u00e9s\u00e9t tanulm\u00e1nyozt\u00e1k &#8212;<br \/>\nAkamai, Alibaba Cloud, Azure, CDN77, CDNsun, Cloudflare, CloudFront, Fastly, G-Core Labs, Huawei Cloud, KeyCDN, StackPath \u00e9s Tencent Cloud. Az \u00f6sszes vizsg\u00e1lt CDN engedett az els\u0151 t\u00e1mad\u00e1st a v\u00e9gs\u0151 szerver ellen. A m\u00e1sodik CDN elleni t\u00e1mad\u00e1sra 6 szolg\u00e1ltat\u00e1s volt \u00e9rz\u00e9keny, amelyek k\u00f6z\u00fcl n\u00e9gy a t\u00e1mad\u00e1s front-endjek\u00e9nt (CDN77, CDNsun, Cloudflare \u00e9s StackPath), m\u00edg h\u00e1rom a backend szerepl\u0151jek\u00e9nt (Akamai, Azure \u00e9s StackPath) m\u0171k\u00f6dhetett. A legnagyobb fokoz\u00e1s az Akamai \u00e9s StackPath eset\u00e9n tapasztalhat\u00f3, amelyek lehet\u0151v\u00e9 teszik, hogy a Range fejl\u00e9cben t\u00f6bb mint 10 ezer tartom\u00e1nyt adjanak meg. A CDN-ek tulajdonosait k\u00f6r\u00fclbel\u00fcl 7 h\u00f3nappal ezel\u0151tt \u00e9rtes\u00edtett\u00e9k a sebezhet\u0151s\u00e9gekr\u0151l, \u00e9s a nyilv\u00e1nos nyilv\u00e1noss\u00e1gra hozatal pillanat\u00e1ban 12 a 13 CDN-b\u0151l orvosolta a felmer\u00fclt probl\u00e9m\u00e1kat, vagy jelezte, hogy k\u00e9szen \u00e1ll az orvosl\u00e1sra (csak a StackPath szolg\u00e1ltat\u00e1s nem reag\u00e1lt).<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53026\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u041f\u0435\u043a\u0438\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430, \u0423\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0426\u0438\u043d\u0445\u0443\u0430 \u0438 \u0422\u0435\u0445\u0430\u0441\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432 \u0414\u0430\u043b\u043b\u0430\u0441\u0435 \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u043a\u043b\u0430\u0441\u0441 DoS-\u0430\u0442\u0430\u043a &#8212; RangeAmp, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 HTTP-\u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u0430 Range \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0443\u0441\u0438\u043b\u0435\u043d\u0438\u044f \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u0447\u0435\u0440\u0435\u0437 \u0441\u0435\u0442\u0438 \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 (CDN). \u0421\u0443\u0442\u044c \u043c\u0435\u0442\u043e\u0434\u0430 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u0438\u0437-\u0437\u0430 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 Range-\u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u043e\u0432 \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 CDN \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043c\u043e\u0436\u0435\u0442 \u0437\u0430\u043f\u0440\u043e\u0441\u0438\u0442\u044c \u0447\u0435\u0440\u0435\u0437 CDN \u043e\u0434\u0438\u043d \u0431\u0430\u0439\u0442 \u0438\u0437 \u0431\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430, \u043d\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":82930,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-82929","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u041f\u0435\u043a\u0438\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430, \u0423\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0426\u0438\u043d\u0445\u0443\u0430 \u0438 \u0422\u0435\u0445\u0430\u0441\u0441\u043a\u043e\u0433\u043e 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