CVE-2023-4812 : Vulnerability Insights and Analysis

This CVE-2023-4812 pertains to an improper access control vulnerability in GitLab that affects various versions of the software. The vulnerability allows bypassing the required CODEOWNERS approval by adding changes to a previously approved merge request.

Understanding CVE-2023-4812

This section delves into the details of the CVE-2023-4812 vulnerability in GitLab.

What is CVE-2023-4812?

The CVE-2023-4812 vulnerability in GitLab is categorized as an improper access control flaw (CWE-284). It impacts GitLab EE versions starting from 15.3 before 16.5.6, versions starting from 16.6 before 16.6.4, and versions starting from 16.7 before 16.7.2.

The Impact of CVE-2023-4812

The vulnerability in GitLab can have a significant impact as it allows unauthorized bypassing of the required CODEOWNERS approval, potentially leading to unauthorized access or modifications within the GitLab environment.

Technical Details of CVE-2023-4812

In this section, we will explore the technical aspects of CVE-2023-4812 vulnerability in GitLab.

Vulnerability Description

The vulnerability arises from a flaw in access control mechanisms in GitLab EE versions, enabling malicious actors to evade the necessary CODEOWNERS approval process.

Affected Systems and Versions

Vendor: GitLab
Product: GitLab
Affected Versions:
Version 15.3 (less than 16.5.6)
Version 16.6 (less than 16.6.4)
Version 16.7 (less than 16.7.2)

Exploitation Mechanism

By exploiting this vulnerability, attackers can bypass CODEOWNERS approval through unauthorized changes to previously approved merge requests, potentially gaining unauthorized access.

Mitigation and Prevention

Protecting systems from CVE-2023-4812 is crucial to maintain security within GitLab environments.

Immediate Steps to Take

Upgrade GitLab to versions 16.7.2, 16.6.4, 16.5.6, or newer to mitigate the vulnerability.
Review and monitor access controls and permissions within GitLab to prevent unauthorized changes.

Long-Term Security Practices

Implement a robust access control policy within GitLab to ensure proper authorization for all actions.
Regularly update and patch GitLab installations to address any security vulnerabilities promptly.

Patching and Updates

Ensure timely installation of security updates and patches released by GitLab to address known vulnerabilities and enhance overall system security.