{"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\/en\/blog\/news\/uyazvimost-v-realizacziyah-protokola-http-2-uproshhayushhaya-provedenie-dos-atak","title":{"rendered":"A vulnerability in HTTP\/2 protocol implementations that simplifies the execution of DoS attacks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A new attack technique has been introduced for HTTP\/2 protocol implementations, simplifying the execution of denial-of-service attacks by exhausting server resources. The vulnerability is codenamed MadeYouReset and allows an attacker to flood the server with a large number of requests through manipulation of HTTP\/2 control frames, bypassing established limits. <\/p>\n

The crux of the issue is that a client can create a very large number of concurrently processed streams, regardless of the SETTINGS_MAX_CONCURRENT_STREAMS limit, resetting each stream at the initial stage. Such resets allow the client to send a new request in the established HTTP\/2 connection without needing to wait for a response from server<\/a> and it can immediately direct a large, continuous stream of requests, as permitted by the bandwidth of the communication channel. <\/p>\n

The client no longer depends on the delays between sending a request and receiving a response (RTT, round-trip time) and can conduct an attack with minimal overhead, while the server continues to expend resources on processing incoming requests. For example, the server allocates data structures for new streams, parses the request, unpacks headers, and matches the URL to resources. In attacks on reverse proxies, the attack may spread to backends to which the proxy can redirect requests before they are reset. <\/p>\n

The vulnerability resembles the previously known Rapid Reset issue (CVE-2023-44487) and is caused by a discrepancy between the reset logic defined in the HTTP\/2 protocol specification and that implemented in end products. The specification allows for stream resets by both the client and the server at any time, but in many HTTP\/2 implementations,servers<\/a> after such a reset, the request continues to be processed. The key distinction of the new attack is that the request processing reset is initiated by the server, rather than through the client sending a frame with the RST_STREAM flag. <\/p>\n

A server-initiated reset occurs when incorrect requests are received, but such requests are discarded immediately without initiating full processing or passing to the backend. To achieve a complete request processing cycle, an attacker may first send a valid HTTP request, followed by an incorrect sequence of HTTP\/2 control frames. This activity will lead the server to start processing the request fully, but then due to an error while processing the subsequent frames, it will reset the stream (changing the stream with the valid request to RST_STREAM state).

\"A<\/center> <\/p>\n

The problem has been confirmed in HTTP servers such as Apache Tomcat, Netty, Eclipse Jetty, Fastly, Varnish, Lighttpd, and Zephyr RTOS. The issue also manifests on Mozilla's websites and server services. Apache httpd, Apache Traffic Server, Node.js, LiteSpeed, and HAProxy are not affected by the problem. The status of the vulnerability in nginx remains undetermined.
\n
Source: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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