CVE-2020-2238 : Security Advisory and Response

Jenkins Git Parameter Plugin 0.9.12 and earlier versions are affected by a stored cross-site scripting (XSS) vulnerability. Attackers with Job/Configure permission can exploit this issue.

Understanding CVE-2020-2238

What is CVE-2020-2238?

Jenkins Git Parameter Plugin versions 0.9.12 and below are susceptible to stored XSS due to unescaped input in the repository field on the 'Build with Parameters' page.

The Impact of CVE-2020-2238

This vulnerability allows attackers with specific permissions to execute malicious scripts within the context of the affected Jenkins instance, potentially leading to unauthorized actions.

Technical Details of CVE-2020-2238

Vulnerability Description

The issue arises from the lack of proper input sanitization in the repository field, enabling attackers to inject and execute malicious scripts.

Affected Systems and Versions

Product: Jenkins Git Parameter Plugin
Vendor: Jenkins project
Versions Affected: <= 0.9.12

Exploitation Mechanism

Attackers with Job/Configure permission can input malicious scripts in the repository field, which are then executed within the Jenkins instance, posing a security risk.

Mitigation and Prevention

Immediate Steps to Take

Upgrade Jenkins Git Parameter Plugin to a version beyond 0.9.12 to mitigate the vulnerability.
Restrict Job/Configure permissions to trusted users only.

Long-Term Security Practices

Regularly review and update Jenkins plugins to ensure the latest security patches are applied.
Educate users on secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Apply security patches and updates promptly to address known vulnerabilities and enhance the overall security posture of the Jenkins environment.