CVE-2020-13311 Explained : Impact and Mitigation

A vulnerability in GitLab versions before 13.1.10, 13.2.8, and 13.3.4 allows a parser attack on the Wiki functionality, hindering user access.

Understanding CVE-2020-13311

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

What is CVE-2020-13311?

The vulnerability found in GitLab versions before 13.1.10, 13.2.8, and 13.3.4 allows a parser attack on the Wiki feature, preventing users from accessing it via the interface.

The Impact of CVE-2020-13311

CVSS Base Score: 4.3 (Medium Severity)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Availability Impact: Low
Confidentiality Impact: None
Integrity Impact: None
Scope: Unchanged

Technical Details of CVE-2020-13311

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from improper input validation in GitLab, affecting versions before 13.1.10, 13.2.8, and 13.3.4.

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

The vulnerability allows attackers to execute a parser attack on the Wiki functionality, blocking user access through the interface.

Mitigation and Prevention

To address CVE-2020-13311, follow these mitigation strategies:

Immediate Steps to Take

Upgrade GitLab to versions 13.1.10, 13.2.8, or 13.3.4 or later to eliminate the vulnerability.
Monitor GitLab security advisories for updates and patches.

Long-Term Security Practices

Regularly update GitLab to the latest versions to ensure security patches are applied.
Conduct security assessments and audits to identify and address vulnerabilities promptly.

Patching and Updates

Apply security patches provided by GitLab promptly to protect against known vulnerabilities.