CVE-2024-23324 Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata
Attackers can bypass external authentication in Envoy proxy by sending invalid UTF-8 metadata when failure_mode_allow is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-23324?
CVE-2024-23324 is a high-severity authentication bypass vulnerability in Envoyproxy Envoy, published on 9 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-20
Which versions are affected by CVE-2024-23324?
1 open source package ship an affected version, including envoy. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
envoy Bitnami | From 1.26.0 | 1.26.7, 1.27.3, 1.28.1, 1.29.1 |
Products include Envoyproxy Envoy.
How do I fix CVE-2024-23324?
Upgrade envoy to a fixed version for your release line: 1.26.7, 1.27.3, 1.28.1 or 1.29.1.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2024-23324 being exploited?
There is no known exploitation of CVE-2024-23324 in the wild and no public exploit code.
Other vulnerabilities in Envoyproxy Envoy
Sources
Also known as BIT-envoy-2024-23324, GHSA-gq3v-vvhj-96j6.