CVE-2023-45288

EIP tracks 1 public exploit for CVE-2023-45288. PoCs published by hex0punk.

AI-analyzed exploit summary This repository contains a functional proof-of-concept exploit for CVE-2023-45288, a CONTINUATION flood vulnerability in HTTP/2 implementations. The code demonstrates the vulnerability by sending excessive CONTINUATION frames to a target server, causing resource exhaustion.

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.