CVE-2024-30255

MEDIUM

HTTP/2: CPU exhaustion due to CONTINUATION frame flood

Title source: CVE List
Search associated code STIX 2.1 vulnerability STIX 2.1 with PoCs

Record summary

CVE-2024-30255 has a selected CVSS score of 5.3 (medium); EIP currently links 2 repository PoCs.

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.

Description source: CVE List

Exploitation context

Available material

Repository PoCs
2

CISA SSVC decision

ExploitationNone
AutomatableYes
Technical impactPartial

CISA Coordinator · SSVC 2.0.3 · Evaluated Apr 8, 2024 · Source: CVE List

Affected products and versions

1
ProductSourceVersion range

envoy

Browse envoyproxy / envoy

Default status: unknown

CVE List1.29.0 to < 1.29.3affected
1.28.0 to < 1.28.2affected
1.27.0 to < 1.27.4affected
Before 1.26.8affected
>= 1.29.0, < 1.29.3affected
>= 1.28.0, < 1.28.2affected
>= 1.27.0, < 1.27.4affected
< 1.26.8affected

Proofs of concept

2

Repository PoCs

GitHublockness-Ko/CVE-2024-27316Repository PoCby lockness-Ko18Not analyzed6 files

22.2 KiB · linked to 6 vulnerabilities

GitHub
PoC details
GitHubblackmagic2023/Envoy-CPU-Exhaustion-Vulnerability-PoCRepository PoCby blackmagic20233Not analyzed2 files

2.8 KiB

GitHub
PoC details

References

4