Description (CNA)
Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, the Envoy RBAC (Role-Based Access Control) filter contains a logic vulnerability in how it validates HTTP headers when multiple values are present for the same header name. Instead of validating each header value individually, Envoy concatenates all values into a single comma-separated string. This behavior allows attackers to bypass RBAC policies—specifically "Deny" rules—by sending duplicate headers, effectively obscuring the malicious value from exact-match mechanisms. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| envoyproxy / envoy | affected >= 1.37.0, < 1.37.1; affected >= 1.36.0, < 1.36.5; affected >= 1.35.0, < 1.35.9; affected < 1.34.13 |
CWE
CWE-863
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-ghc4-35x6-crw5
- https://github.com/envoyproxy/envoy/commit/b6ba0b2294b98484fb0ed8556897d1073cc27867
ADP enrichment
No English description supplied.
No references supplied.