CVE-2020-13303 : Security Advisory and Response

A vulnerability in GitLab versions before 13.1.10, 13.2.8, and 13.3.4 allows unauthorized access to private repositories within public projects due to improper permission verification.

Understanding CVE-2020-13303

This CVE involves an improper authorization issue in GitLab, impacting versions prior to 13.1.10, 13.2.8, and 13.3.4.

What is CVE-2020-13303?

CVE-2020-13303 is a security vulnerability found in GitLab versions before 13.1.10, 13.2.8, and 13.3.4, enabling unauthorized users to reach private repositories within public projects.

The Impact of CVE-2020-13303

CVSS Base Score: 7.1 (High Severity)
Attack Vector: Network
Confidentiality Impact: High
Integrity Impact: Low
Privileges Required: Low
Scope: Unchanged
User Interaction: None
Attack Complexity: Low
Availability Impact: None

Technical Details of CVE-2020-13303

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from improper permission validation in GitLab, allowing unauthorized users to access private repositories in public projects.

Affected Systems and Versions

Affected Product: GitLab
Vendor: GitLab
Vulnerable Versions:
=1.0, <13.1.10

=13.2, <13.2.8

=13.3, <13.3.4

Exploitation Mechanism

Unauthorized users exploit the lack of proper permission checks to gain access to private repositories within public projects.

Mitigation and Prevention

Protect your systems from CVE-2020-13303 with these mitigation strategies.

Immediate Steps to Take

Upgrade GitLab to versions 13.1.10, 13.2.8, or 13.3.4 or newer.
Monitor repository access for unauthorized activities.
Implement least privilege access controls.

Long-Term Security Practices

Regularly review and update permission settings.
Conduct security training for users on access control best practices.

Patching and Updates

Apply security patches promptly.
Stay informed about security advisories from GitLab.