Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation
Résumé
Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation
Description d'origine
La description telle que publiée par la source (souvent en anglais).
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Paquets affectés
Références
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- patch github.com