CVE-2021-39937 : Vulnerability Insights and Analysis

A detailed overview of the GitLab vulnerability with CVE ID 2021-39937.

Understanding CVE-2021-39937

This section provides insights into the GitLab vulnerability marked with CVE ID 2021-39937.

What is CVE-2021-39937?

The vulnerability involves a collision in access memoization logic in various versions of GitLab CE/EE.
Affected versions include those before 14.3.6, between 14.4 and 14.4.4, and between 14.5 and 14.5.2.
It can lead to potential elevated privileges in groups and projects under specific circumstances.

The Impact of CVE-2021-39937

CVSS v3.1 severity: Medium
Base score: 5.9
Attack complexity: High
Attack vector: Network
Low confidentiality impact, high integrity impact

Technical Details of CVE-2021-39937

Insights into the technical aspects of the GitLab vulnerability.

Vulnerability Description

The issue pertains to improper access control within GitLab.

Affected Systems and Versions

GitLab versions <14.3.6, >=14.4, and <14.5.2 are vulnerable.

Exploitation Mechanism

The vulnerability may be exploited to gain elevated privileges in affected groups and projects.

Mitigation and Prevention

Suggestions for addressing the CVE-2021-39937 vulnerability.

Immediate Steps to Take

Update GitLab to version 14.3.6, 14.4.4, or 14.5.2 to mitigate the vulnerability.
Review and adjust project and group permissions in GitLab.
Monitor for any unauthorized access or activities in affected areas.

Long-Term Security Practices

Regularly update GitLab installations to the latest versions.
Conduct security audits to identify and address access control issues.

Patching and Updates

Stay informed about security patches and updates released by GitLab.