CVE-2020-13340 : What You Need to Know

An issue has been discovered in GitLab affecting versions prior to 13.2.10, 13.3.7, and 13.4.2, leading to Stored XSS in CI Job Log.

Understanding CVE-2020-13340

This CVE involves a Stored Cross-Site Scripting (XSS) vulnerability in GitLab, impacting versions before 13.2.10, 13.3.7, and 13.4.2.

What is CVE-2020-13340?

CVE-2020-13340 is a security flaw in GitLab that allows attackers to inject malicious scripts into CI Job Logs, potentially leading to unauthorized access or data manipulation.

The Impact of CVE-2020-13340

The vulnerability has a CVSS base score of 8.7 (High severity) with significant impacts on confidentiality, integrity, and user interaction.

Technical Details of CVE-2020-13340

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The issue involves improper neutralization of input during web page generation, specifically a Stored XSS in the CI Job Log functionality of GitLab.

Affected Systems and Versions

Product: GitLab
Versions Affected:
=12.4, <13.2.10

=13.3, <13.3.7

=13.4, <13.4.2

Exploitation Mechanism

The vulnerability can be exploited by an attacker who can interact with the affected system via a network connection, requiring low privileges but user interaction.

Mitigation and Prevention

Protecting systems from CVE-2020-13340 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update GitLab to versions 13.2.10, 13.3.7, or 13.4.2 to eliminate the vulnerability.
Monitor and review CI Job Logs for any suspicious activities.

Long-Term Security Practices

Implement input validation mechanisms to prevent XSS attacks.
Conduct regular security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Regularly apply security patches and updates provided by GitLab to ensure the system's security integrity.