CVE-2021-39206 Explained : Impact and Mitigation

Pomerium is an open source identity-aware access proxy based on Envoy. This CVE highlights vulnerabilities that could lead to incorrect routing or authorization decisions.

Understanding CVE-2021-39206

Pomerium's vulnerability allows for wrong authorization or routing decisions due to vulnerabilities in Envoy.

What is CVE-2021-39206?

Pomerium, an access proxy, is affected when using path prefix-based policies, allowing incorrect authorization or routing decisions.

The Impact of CVE-2021-39206

CVSS Score: 8.6 (High Severity)
Confidentiality Impact: High
Attack Vector: Network
Scope: Changed
The vulnerabilities in Envoy may lead to incorrect routing or authorization policy decisions.

Technical Details of CVE-2021-39206

The technical details of this CVE provide insight into the vulnerability, affected systems, and exploitation mechanisms.

Vulnerability Description

Envoy vulnerabilities CVE-2021-32777 and CVE-2021-32779 result in incorrect authorization or routing decisions

Affected Systems and Versions

Product: Pomerium
Vendor: Pomerium
Versions:
= 0.11.0, < 0.14.8

= 0.15.0, < 0.15.1

Exploitation Mechanism

The vulnerabilities can be exploited with specially crafted requests in path prefix-based policies

Mitigation and Prevention

Mitigation steps are crucial to prevent exploitation and ensure system security.

Immediate Steps to Take

Upgrade to Pomerium v0.14.8 or v0.15.1 with patched vulnerabilities
Remove any path prefix-based policies

Long-Term Security Practices

Regularly update Pomerium and Envoy versions
Implement least privilege access policies

Patching and Updates

Deploy security patches from Pomerium to ensure system integrity