CVE-2021-32777

 

Published at: - 24-08-2021 11:15

Last modified: - 15-06-2022 05:50

Total changes: - 7

Description

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions when ext-authz extension is sending request headers to the external authorization service it must merge multiple value headers according to the HTTP spec. However, only the last header value is sent. This may allow specifically crafted requests to bypass authorization. Attackers may be able to escalate privileges when using ext-authz extension or back end service that uses multiple value headers for authorization. A specifically constructed request may be delivered by an untrusted downstream peer in the presence of ext-authz extension. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to the ext-authz extension to correctly merge multiple request header values, when sending request for authorization.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h
• https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history

 

Keywords

NVD

 

CVE-2021-32777

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures