CVE-2024-30255 Information

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.

Reference

https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm