CVE-2024-32974: envoy Use-After-Free — Exploit

Description

Envoy is a cloud-native, open source edge and service proxy. A crash was observed in `EnvoyQuicServerStream::OnInitialHeadersComplete()` with following call stack. It is a use-after-free caused by QUICHE continuing push request headers after `StopReading()` being called on the stream. As after `StopReading()`, the HCM's `ActiveStream` might have already be destroyed and any up calls from QUICHE could potentially cause use after free.

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CVSS v3.1 Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
envoyproxy	envoy	< 1.27.6
envoyproxy	envoy	1.28.0 — 1.28.4
envoyproxy	envoy	1.29.0 — 1.29.5
envoyproxy	envoy	1.30.0 — 1.30.2

References

Exploits

https://github.com/envoyproxy/envoy/security/advisories/GHSA-mgxp-7hhp-8299 https://github.com/envoyproxy/envoy/security/advisories/GHSA-mgxp-7hhp-8299

Frequently Asked Questions

What is CVE-2024-32974? +

Envoy is a cloud-native, open source edge and service proxy. A crash was observed in `EnvoyQuicServerStream::OnInitialHeadersComplete()` with following call stack. It is a use-after-free caused by QUICHE continuing push request headers after `StopReading()` being called on the stream. As after `StopReading()`, the HCM's `ActiveStream` might have already be destroyed and any up calls from QUICHE could potentially cause use after free. It has a CVSS v3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2024-32974? +

CVE-2024-32974 has a CVSS v3.1 score of 5.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-32974? +

CVE-2024-32974 affects products from envoyproxy, specifically: envoy. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-32974? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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