{"id":37095,"date":"2019-10-31T22:15:43","date_gmt":"2019-10-31T19:15:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/v-razlichnyh-realizatsiyah-protokola-http-2-vyyavleno-8-dos-uyazvimostej\/"},"modified":"2019-10-31T22:15:43","modified_gmt":"2019-10-31T19:15:43","slug":"v-razlichnyh-realizatsiyah-protokola-http-2-vyyavleno-8-dos-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/v-razlichnyh-realizatsiyah-protokola-http-2-vyyavleno-8-dos-uyazvimostej","title":{"rendered":"W r\u00f3\u017cnych implementacjach protoko\u0142u HTTP\/2 zidentyfikowano 8 luk DoS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Badacze z firm Netflix i Google <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Netflix\/security-bulletins\/blob\/master\/advisories\/third-party\/2019-002.md\">ujawnili<\/a><\/noindex>  w r\u00f3\u017cnych implementacjach protoko\u0142u HTTP\/2 zidentyfikowano osiem podatno\u015bci, kt\u00f3re mog\u0105 prowadzi\u0107 do odmowy us\u0142ugi poprzez wysy\u0142anie odpowiednio sformatowanych strumieni zapyta\u0144 sieciowych. Problemy te w r\u00f3\u017cnym stopniu dotycz\u0105 wi\u0119kszo\u015bci serwer\u00f3w HTTP obs\u0142uguj\u0105cych HTTP\/2 i prowadz\u0105 do wyczerpania dost\u0119pnej pami\u0119ci roboczej lub generowania zbyt du\u017cego obci\u0105\u017cenia procesora. Aktualizacje naprawiaj\u0105ce te luki s\u0105 ju\u017c dost\u0119pne w <noindex><a rel=\"nofollow\" href=\"http:\/\/mailman.nginx.org\/pipermail\/nginx-announce\/2019\/000247.html\">nginx 1.16.1\/1.17.3<\/a><\/noindex> i <noindex><a rel=\"nofollow\" href=\"http:\/\/blog.kazuhooku.com\/2019\/08\/h2o-version-226-230-beta2-released.html\">H2O 2.2.6<\/a><\/noindex>, ale na razie <noindex><a rel=\"nofollow\" href=\"http:\/\/www.apache.org\/dist\/httpd\/\">niedost\u0119pne<\/a><\/noindex> dla Apache httpd i <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kb.cert.org\/vuls\/id\/605641\/\">innych produkt\u00f3w<\/a><\/noindex>.<\/p>\n<p>Problemy s\u0105 wynikiem wprowadzonych w protokole HTTP\/2 komplikacji zwi\u0105zanych z u\u017cyciem struktur binarnych, systemem ograniczania strumieni danych w ramach po\u0142\u0105cze\u0144, mechanizmem priorytetyzacji strumieni oraz obecno\u015bci\u0105 komunikat\u00f3w kontrolnych podobnych do ICMP, dzia\u0142aj\u0105cych na poziomie po\u0142\u0105czenia HTTP\/2 (na przyk\u0142ad operacji ping, resetu i konfiguracji strumienia). Wiele implementacji nie ogranicza\u0142o odpowiednio strumienia komunikat\u00f3w kontrolnych, nieefektywnie organizowa\u0142o dzia\u0142anie kolejki priorytet\u00f3w podczas przetwarzania zapyta\u0144 lub stosowa\u0142o nieoptymalne realizacje algorytm\u00f3w sterowania przep\u0142ywem.<\/p>\n<p>Wi\u0119kszo\u015b\u0107 zidentyfikowanych metod ataku sprowadza si\u0119 do wysy\u0142ania do serwera okre\u015blonych zapyta\u0144, kt\u00f3re generuj\u0105 du\u017c\u0105 liczb\u0119 odpowiedzi. Je\u015bli klient nie odczytuje danych z gniazda i nie zrywa po\u0142\u0105czenia, kolejka buforowania odpowiedzi po stronie serwera nieustannie si\u0119 zape\u0142nia. Takie zachowanie generuje obci\u0105\u017cenie systemu zarz\u0105dzania kolejkami proces\u00f3w sieciowych i w zale\u017cno\u015bci od specyfiki implementacji prowadzi do wyczerpania dost\u0119pnej pami\u0119ci lub zasob\u00f3w CPU.<\/p>\n<p>Zidentyfikowane luki:<\/p>\n<ul>\n<li class=\"l\"> CVE-2019-9511 (Data Dribble) \u2014 atakuj\u0105cy \u017c\u0105da du\u017cej ilo\u015bci danych w kilku strumieniach, manipuluj\u0105c rozmiarem okna przesuwnego i priorytetem strumienia, zmuszaj\u0105c serwer do umieszczania danych w kolejce w blokach po 1 bajcie;\n<li class=\"l\">  CVE-2019-9512 (Ping Flood) \u2014 atakuj\u0105cy nieprzerwanie wysy\u0142a komunikaty ping przez po\u0142\u0105czenie HTTP\/2, inicjuj\u0105c zape\u0142nienie wewn\u0119trznej kolejki odpowiedzi po drugiej stronie;\n<li class=\"l\"> CVE-2019-9513 (Resource Loop) \u2014 atakuj\u0105cy tworzy kilka strumieni zapyta\u0144 i ci\u0105gle zmienia priorytet strumieni, powoduj\u0105c mieszanie drzewa priorytet\u00f3w;\n<li class=\"l\"> CVE-2019-9514 (Reset Flood) \u2014 atakuj\u0105cy tworzy kilka strumieni<br \/>\n i wysy\u0142a przez ka\u017cdy strumie\u0144 niepoprawne \u017c\u0105danie, powoduj\u0105c wysy\u0142anie przez serwer ramek RST_STREAM, ale ich nie przyjmuje do wype\u0142nienia kolejki odpowiedzi;<\/p>\n<li class=\"l\"> CVE-2019-9515 (Zalewanie ustawie\u0144) \u2014 atakuj\u0105cy wysy\u0142a strumie\u0144 pustych ramek \u00abSETTINGS\u00bb, na co serwer musi potwierdzi\u0107 otrzymanie ka\u017cdego \u017c\u0105dania;\n<li class=\"l\">  CVE-2019-9516 (Wycieki nag\u0142\u00f3wk\u00f3w o d\u0142ugo\u015bci 0) \u2014 atakuj\u0105cy wysy\u0142a strumie\u0144 nag\u0142\u00f3wk\u00f3w z zerow\u0105 nazw\u0105 i zerow\u0105 warto\u015bci\u0105, a serwer przydziela ka\u017cdemu nag\u0142\u00f3wkowi bufor w pami\u0119ci i nie zwalnia go do zako\u0144czenia sesji;\n<li class=\"l\">   CVE-2019-9517 (Wewn\u0119trzne buforowanie danych) \u2014 atakuj\u0105cy otwiera<br \/>\nprzesuwne okno HTTP\/2 do wysy\u0142ania danych przez serwer bez ogranicze\u0144, jednocze\u015bnie utrzymuj\u0105c okno TCP zamkni\u0119te, co uniemo\u017cliwia faktyczne zapisanie danych w gnie\u017adzie. Nast\u0119pnie atakuj\u0105cy wysy\u0142a \u017c\u0105dania wymagaj\u0105ce du\u017cej odpowiedzi;<\/p>\n<li class=\"l\"> CVE-2019-9518 (Zalewanie pustymi ramkami) \u2014 atakuj\u0105cy wysy\u0142a strumie\u0144 ramek typu DATA, HEADERS, CONTINUATION lub PUSH_PROMISE, ale z pust\u0105 zawarto\u015bci\u0105 i bez flagi zako\u0144czenia strumienia. Serwer marnuje czas na przetwarzanie ka\u017cdej ramki, nieproporcjonalnie do wykorzystanej przez atakuj\u0105cego przepustowo\u015bci.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51279\">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 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Netflix \u0438 Google \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0432 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 HTTP\/2 \u0432\u043e\u0441\u0435\u043c\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043e\u0442\u043a\u0430\u0437 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u043e\u0442\u043e\u043a\u0430 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0442\u043e\u0439 \u0438\u043b\u0438 \u0438\u043d\u043e\u0439 \u043c\u0435\u0440\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0442 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e HTTP-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0441 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u043e\u0439 HTTP\/2 \u0438 \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0442 \u043a \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u044e \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0447\u0435\u0433\u043e \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 \u043f\u0430\u043c\u044f\u0442\u0438 \u0438\u043b\u0438 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044e \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u043d\u0430 [&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-37095","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Netflix \u0438 Google \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0432 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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