CVE-2021-39901 Explained : Impact and Mitigation

CVE-2021-39901 is a vulnerability found in GitLab affecting versions between 11.10 and 14.4.1. This CVE allows group admins to access SCIM tokens through a specific endpoint.

Understanding CVE-2021-39901

CVE-2021-39901 involves an information exposure issue in GitLab, presenting a low severity threat.

What is CVE-2021-39901?

In all versions of GitLab CE/EE since version 11.10, an admin of a group can see the SCIM token of that group by visiting a specific endpoint.

The Impact of CVE-2021-39901

The vulnerability can result in an admin of a group accessing sensitive SCIM tokens, potentially leading to unauthorized information disclosure.

Technical Details of CVE-2021-39901

This section provides technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows group admins in GitLab to view SCIM tokens through a specific endpoint.

Affected Systems and Versions

Product: GitLab
Versions Affected: >=11.10, <14.2.6, >=14.3, <14.3.4, >=14.4, <14.4.1

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: High
Confidentiality Impact: Low
Integrity Impact: None
User Interaction: None

Mitigation and Prevention

To address CVE-2021-39901, follow the mitigation strategies below.

Immediate Steps to Take

Upgrade GitLab to a fixed version.
Restrict access to sensitive endpoints.

Long-Term Security Practices

Regularly monitor and audit group activities in GitLab.
Educate administrators about secure configuration practices.

Patching and Updates

Apply security patches promptly.