CVE-2021-22261 Explained : Impact and Mitigation

A stored Cross-Site Scripting vulnerability in the Jira integration in all GitLab versions starting from 13.9 before 14.0.9, all versions starting from 14.1 before 14.1.4, and all versions starting from 14.2 before 14.2.2 allows an attacker to execute arbitrary JavaScript code on the victim's behalf via malicious Jira API responses.

Understanding CVE-2021-22261

This CVE involves a stored Cross-Site Scripting vulnerability in GitLab's Jira integration, affecting multiple versions of GitLab software.

What is CVE-2021-22261?

The CVE-2021-22261 vulnerability allows attackers to run arbitrary JavaScript code on a victim's device by manipulating Jira API responses within specific GitLab versions.

The Impact of CVE-2021-22261

The impact of this vulnerability is rated as HIGH, with a CVSSv3.1 base score of 7.2. It can lead to unauthorized access, data theft, and manipulation of sensitive information.

Technical Details of CVE-2021-22261

This section outlines the technical aspects of the CVE to provide a deeper understanding of the issue.

Vulnerability Description

The vulnerability involves improper neutralization of input during web page generation, enabling cross-site scripting attacks on GitLab's Jira integration.

Affected Systems and Versions

GitLab versions between 13.9 and 14.2.2 are affected by this vulnerability, specifically versions 13.9 to 14.0.9, 14.1 to 14.1.4, and 14.2 to 14.2.2.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious Jira API responses that contain JavaScript code, which, when executed on the victim's device, can lead to unauthorized actions.

Mitigation and Prevention

To protect systems and data from CVE-2021-22261, immediate steps should be taken along with long-term security practices to prevent similar vulnerabilities in the future.

Immediate Steps to Take

Update GitLab to versions 14.0.9, 14.1.4, and 14.2.2 or newer to mitigate the vulnerability.
Monitor for any suspicious behavior indicating a potential exploitation of the CVE.

Long-Term Security Practices

Regularly update software and follow GitLab's security advisories for patch releases.
Educate users and developers about secure coding practices and the risks of cross-site scripting vulnerabilities.

Patching and Updates

Stay informed about security updates from GitLab and promptly apply patches to ensure protection against known vulnerabilities.