CVE-2020-13271 Explained : Impact and Mitigation

A Stored Cross-Site Scripting vulnerability in GitLab allowed the execution of arbitrary Javascript code in previous versions up to 13.0.1.

Understanding CVE-2020-13271

This CVE involves a Stored Cross-Site Scripting vulnerability in GitLab, impacting various versions.

What is CVE-2020-13271?

This vulnerability allowed attackers to execute arbitrary Javascript code through the blobs API in GitLab versions up to 13.0.1.

The Impact of CVE-2020-13271

CVSS Base Score: 6.1 (Medium Severity)
Attack Vector: Network
Attack Complexity: Low
User Interaction: Required
Scope: Changed
Confidentiality and Integrity Impact: Low
Privileges Required: None
Availability Impact: None

Technical Details of CVE-2020-13271

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability stems from improper neutralization of input during web page generation, leading to cross-site scripting in GitLab.

Affected Systems and Versions

Affected Product: GitLab
Vendor: GitLab
Vulnerable Versions:
<12.9.8

=12.10, <12.10.7

=13.0, <13.0.1

Exploitation Mechanism

The vulnerability could be exploited by injecting malicious Javascript code through the blobs API in GitLab.

Mitigation and Prevention

Protect your systems from CVE-2020-13271 with these mitigation strategies.

Immediate Steps to Take

Update GitLab to versions 12.9.8, 12.10.7, or 13.0.1 to patch the vulnerability.
Monitor and restrict user input to prevent XSS attacks.

Long-Term Security Practices

Regularly scan and audit your GitLab instance for vulnerabilities.
Educate developers on secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Stay informed about security updates from GitLab and apply patches promptly.