{"id":140668,"date":"2025-08-14T11:12:07","date_gmt":"2025-08-14T09:12:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-realizacziyah-protokola-http-2-uproshhayushhaya-provedenie-dos-atak"},"modified":"2025-08-14T11:12:07","modified_gmt":"2025-08-14T09:12:07","slug":"uyazvimost-v-realizacziyah-protokola-http-2-uproshhayushhaya-provedenie-dos-atak","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-realizacziyah-protokola-http-2-uproshhayushhaya-provedenie-dos-atak","title":{"rendered":"Vulnerabilit\u00e0 nelle implementazioni del protocollo HTTP\/2 che facilitano l'esecuzione di attacchi DoS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata presentata una nuova tecnica di attacco alle implementazioni del protocollo HTTP\/2, che semplifica la conduzione di attacchi per provocare un'interruzione del servizio tramite il consumo delle risorse del server. La vulnerabilit\u00e0 \u00e8 stata soprannominata MadeYouReset e consente, attraverso la manipolazione dei frame di controllo HTTP\/2, di inondare il server con un gran numero di richieste, eludendo i vincoli impostati.     <\/p>\n<p>Il problema principale \u00e8 che il cliente pu\u00f2 creare un numero molto elevato di flussi elaborati simultaneamente, indipendentemente dal limite SETTINGS_MAX_CONCURRENT_STREAMS, resettando ogni flusso all'inizio. Questo reset fa s\u00ec che per inviare una nuova richiesta nella connessione stabilita HTTP\/2 non sia necessario attendere una risposta da <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-los-angeles\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3975\">server<\/a> e si pu\u00f2 immediatamente inviare un grande flusso continuo di richieste, fino al limite della capacit\u00e0 di banda disponibile.       <\/p>\n<p>Il cliente smette di dipendere dai ritardi tra l'invio della richiesta e la ricezione della risposta (RTT, round-trip time) e pu\u00f2 condurre un attacco con costi marginali, mentre il server continua a spendere risorse per elaborare le richieste in arrivo. Ad esempio, il server effettua l'allocazione delle strutture dati per i nuovi flussi, l'analisi della richiesta, la decompressione dell'intestazione e il confronto dell'URL con la risorsa. In un attacco ai proxy reversi, l'attacco pu\u00f2 espandersi ai backend verso i quali il proxy riesce a reindirizzare la richiesta prima del suo reset.    <\/p>\n<p>La vulnerabilit\u00e0 ricorda un problema gi\u00e0 noto come Rapid Reset (CVE-2023-44487) ed \u00e8 causata da una divergenza nella logica di reset dei flussi, definita nella specifica del protocollo HTTP\/2 e implementata nei prodotti finali. Nella specifica \u00e8 prevista la possibilit\u00e0 di resettare il flusso dal client e dal server in qualsiasi momento, ma in molte implementazioni HTTP\/2,<a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1779\">server<\/a> dopo tale reset la richiesta continua a essere elaborata. La principale differenza del nuovo attacco \u00e8 che il reset dell'elaborazione della richiesta avviene su iniziativa del server e non tramite l'invio da parte del client di un frame con il flag RST_STREAM.     <\/p>\n<p>Il riavvio per iniziativa del server avviene quando vengono ricevute richieste non valide, ma tali richieste vengono scartate immediatamente senza avviare un'elaborazione completa e senza essere trasmesse al backend. Per completare il ciclo di elaborazione della richiesta, l'attaccante potrebbe iniziare inviando una richiesta HTTP valida, seguita da una sequenza non valida di frame di controllo HTTP\/2. Tale attivit\u00e0 porter\u00e0 il server a iniziare a elaborare la richiesta, ma a causa di un errore nell'elaborazione dei frame successivi, il flusso verr\u00e0 resettato (portando il flusso con la richiesta valida allo stato RST_STREAM).    <center><img decoding=\"async\" alt=\"Vulnerabilit\u00e0 nelle implementazioni del protocollo HTTP\/2 che facilitano l&#039;esecuzione di attacchi DoS\" src=\"\/wp-content\/uploads\/2025\/08\/3d278bdbd71f2845b0b29436ab30e8fb.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>La presenza del problema \u00e8 stata confermata nei server HTTP Apache Tomcat, Netty, Eclipse Jetty, Fastly, varnish, lighttpd, Zephyr RTOS. Il problema si manifesta anche sui siti e servizi server di Mozilla. Apache httpd, Apache Traffic Server, Node.js, LiteSpeed e HAProxy non sono vulnerabili al problema. Lo stato della vulnerabilit\u00e0 in nginx non \u00e8 stato determinato.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63726\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u043d\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 HTTP\/2, \u0443\u043f\u0440\u043e\u0449\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0430\u0442\u0430\u043a \u0434\u043b\u044f \u0432\u044b\u0437\u043e\u0432\u0430 \u043e\u0442\u043a\u0430\u0437\u0430 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f MadeYouReset \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u043c\u0438 \u043a\u0430\u0434\u0440\u0430\u043c\u0438 HTTP\/2 \u043d\u0430\u0432\u043e\u0434\u043d\u0438\u0442\u044c \u0441\u0435\u0440\u0432\u0435\u0440 \u0431\u043e\u043b\u044c\u0448\u0438\u043c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e\u043c \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0432 \u043e\u0431\u0445\u043e\u0434 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043a\u043b\u0438\u0435\u043d\u0442 \u043c\u043e\u0436\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043e\u0447\u0435\u043d\u044c \u0431\u043e\u043b\u044c\u0448\u043e\u0435 \u0447\u0438\u0441\u043b\u043e \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c\u044b\u0445 \u043f\u043e\u0442\u043e\u043a\u043e\u0432, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":140669,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-140668","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u043d\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 HTTP\/2, \u0443\u043f\u0440\u043e\u0449\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435 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