CVE-2024-30255
MEDIUMEnvoy < 1.26.8 - Denial of Service via HTTP/2 CONTINUATION Frame Flood
Title source: llmExploitation Summary
EIP tracks 2 public exploits for CVE-2024-30255. PoCs published by lockness-Ko, blackmagic2023.
AI-analyzed exploit summary This repository contains a functional Go-based proof-of-concept exploit for CVE-2024-27316, targeting HTTP/2 servers with a denial-of-service (DoS) attack via malformed headers. The exploit leverages HPACK header compression to flood the target with crafted headers, causing resource exhaustion.
Description
Envoy is a cloud-native, open source edge and service proxy. The HTTP/2 protocol stack in Envoy versions prior to 1.29.3, 1.28.2, 1.27.4, and 1.26.8 are vulnerable to CPU exhaustion due to flood of CONTINUATION frames. Envoy's HTTP/2 codec allows the client to send an unlimited number of CONTINUATION frames even after exceeding Envoy's header map limits. This allows an attacker to send a sequence of CONTINUATION frames without the END_HEADERS bit set causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic and culminating in denial of service through CPU exhaustion. Users should upgrade to version 1.29.3, 1.28.2, 1.27.4, or 1.26.8 to mitigate the effects of the CONTINUATION flood. As a workaround, disable HTTP/2 protocol for downstream connections.
Exploits (2)
This repository contains a functional Go-based proof-of-concept exploit for CVE-2024-27316, targeting HTTP/2 servers with a denial-of-service (DoS) attack via malformed headers. The exploit leverages HPACK header compression to flood the target with crafted headers, causing resource exhaustion.
This repository contains a functional Python script that demonstrates a CPU exhaustion vulnerability in Envoy by flooding the target with CONTINUATION frames. The PoC exploits a flaw in Envoy's HTTP/2 codec, which allows unlimited CONTINUATION frames even after exceeding header map limits.
References (4)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L