CVE-2020-8664 : Exploit Details and Defense Strategies

CNCF Envoy through 1.13.0 has incorrect Access Control when using SDS with Combined Validation Context. This vulnerability could allow the 'static' part of the validation context to not be applied, despite being visible in the active config dump.

Understanding CVE-2020-8664

CNCF Envoy through version 1.13.0 is susceptible to incorrect Access Control when utilizing SDS with Combined Validation Context.

What is CVE-2020-8664?

CNCF Envoy through version 1.13.0 is affected by a vulnerability that may result in the 'static' part of the validation context not being applied, even though it is visible in the active config dump.

The Impact of CVE-2020-8664

The vulnerability could potentially allow unauthorized access due to incorrect Access Control settings, posing a security risk to systems using CNCF Envoy.

Technical Details of CVE-2020-8664

CNCF Envoy through version 1.13.0 is affected by a specific vulnerability.

Vulnerability Description

The issue arises when using SDS with Combined Validation Context, leading to the 'static' part of the validation context not being correctly applied.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by utilizing the same secret (e.g., trusted CA) across multiple resources alongside the combined validation context.

Mitigation and Prevention

Steps to address and prevent the CVE-2020-8664 vulnerability.

Immediate Steps to Take

Update CNCF Envoy to version 1.13.1 or later to mitigate the vulnerability.
Implement proper access control measures and restrict access to sensitive resources.

Long-Term Security Practices

Regularly review and update access control configurations.
Monitor and audit access to critical resources to detect any unauthorized activities.

Patching and Updates

Stay informed about security advisories and updates from CNCF Envoy.