CVE-2021-39934 : Exploit Details and Defense Strategies

This CVE article provides detailed information about a vulnerability in GitLab with improper access control allowing any project member to access email addresses.

Understanding CVE-2021-39934

This section aims to explain the nature and impact of CVE-2021-39934.

What is CVE-2021-39934?

CVE-2021-39934 is a vulnerability in GitLab versions that allows any project member to retrieve the service desk email address, impacting confidentiality and security.

The Impact of CVE-2021-39934

The vulnerability poses a medium threat with a CVSS v3.1 base score of 4.3 and low confidentiality impact due to improper access control.

Technical Details of CVE-2021-39934

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability involves an authorization bypass through a user-controlled key in GitLab, affecting versions from 12.10 to 14.5.2.

Affected Systems and Versions

Affected Product: GitLab
Versions: >=12.10, <14.3.6; >=14.4, <14.4.4; >=14.5, <14.5.2

Exploitation Mechanism

The vulnerability can be exploited by any project member to retrieve service desk email addresses due to improper access control in the affected GitLab versions.

Mitigation and Prevention

This section provides guidance on mitigating the CVE.

Immediate Steps to Take

Update GitLab to version 14.3.6, 14.4.4, or 14.5.2 to patch the vulnerability.
Monitor access to service desk email addresses and limit permissions.

Long-Term Security Practices

Regularly review and update access control policies in GitLab.
Conduct security training for project members on data confidentiality.

Patching and Updates

GitLab has released patches in versions 14.3.6, 14.4.4, and 14.5.2 to address the vulnerability.