CVE-2021-22241 Explained : Impact and Mitigation

An issue has been discovered in GitLab CE/EE that impacts all versions starting from 14.0, allowing for the exploitation of a stored cross-site scripting vulnerability through a specifically crafted default branch name.

Understanding CVE-2021-22241

This CVE impacts GitLab, specifically versions greater than or equal to 14.0 and less than 14.1.2, as well as versions greater than or equal to 14.0 and less than 14.0.7.

What is CVE-2021-22241?

CVE-2021-22241 is a vulnerability in GitLab that enables attackers to execute a stored cross-site scripting attack by utilizing a specially designed default branch name.

The Impact of CVE-2021-22241

The impact of this vulnerability is rated as high severity due to its ability to compromise confidentiality and integrity, with a CVSS base score of 8.7.

Technical Details of CVE-2021-22241

This section provides more insight into the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from improper neutralization of input during web page generation ('cross-site scripting') in GitLab, leading to the execution of malicious scripts.

Affected Systems and Versions

GitLab versions starting from 14.0 up to version 14.1.2 and 14.0.7 are impacted by this vulnerability.

Exploitation Mechanism

Attackers exploit this vulnerability by creating a specially crafted default branch name to inject and execute malicious scripts.

Mitigation and Prevention

To safeguard your systems from CVE-2021-22241, follow these essential mitigation steps and long-term security practices.

Immediate Steps to Take

Update GitLab to versions 14.1.2 or 14.0.7 to patch the vulnerability.
Monitor for any suspicious activities related to branch names or script injections on your GitLab instances.

Long-Term Security Practices

Regularly update GitLab to the latest versions to ensure the inclusion of security patches and enhancements.
Conduct security audits and penetration testing to identify and mitigate potential vulnerabilities.

Patching and Updates

Stay informed about security advisories from GitLab and promptly apply recommended patches and updates to protect your systems effectively.