CVE-2020-13289 : Exploit Details and Defense Strategies

A vulnerability was discovered in GitLab versions before 13.1.10, 13.2.8, and 13.3.4, allowing acceptance of an invalid username when 2FA is activated.

Understanding CVE-2020-13289

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

What is CVE-2020-13289?

The vulnerability in GitLab versions before 13.1.10, 13.2.8, and 13.3.4 allows acceptance of invalid usernames when 2FA is active.

The Impact of CVE-2020-13289

CVSS Base Score: 5.4 (Medium Severity)
Attack Vector: Network
Attack Complexity: Low
Confidentiality Impact: Low
Integrity Impact: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Availability Impact: None

Technical Details of CVE-2020-13289

Vulnerability Description

The vulnerability allows acceptance of invalid usernames under certain conditions when 2FA is enabled in affected GitLab versions.

Affected Systems and Versions

Affected Product: GitLab
Vendor: GitLab
Vulnerable Versions:
=8.7, <13.1.10

=13.2, <13.2.8

=13.3, <13.3.4

Exploitation Mechanism

The vulnerability can be exploited by submitting an invalid username when 2FA is activated in the specified GitLab versions.

Mitigation and Prevention

Immediate Steps to Take

Update GitLab to versions 13.1.10, 13.2.8, or 13.3.4 or later to mitigate the vulnerability.
Disable 2FA until the system is patched to prevent exploitation.

Long-Term Security Practices

Regularly monitor and apply security updates for GitLab to address potential vulnerabilities.
Implement multi-factor authentication best practices to enhance account security.

Patching and Updates

Apply the latest patches and updates provided by GitLab to ensure the security of the system.