CVE-2020-2257 : Vulnerability Insights and Analysis

Jenkins Validating String Parameter Plugin 2.4 and earlier versions are susceptible to a stored cross-site scripting (XSS) vulnerability due to inadequate user-controlled field escaping.

Understanding CVE-2020-2257

This CVE involves a security issue in the Jenkins Validating String Parameter Plugin that allows attackers with Job/Configure permission to exploit a stored XSS vulnerability.

What is CVE-2020-2257?

The vulnerability in Jenkins Validating String Parameter Plugin 2.4 and earlier versions enables attackers to execute malicious scripts through user-controlled fields, posing a risk of cross-site scripting attacks.

The Impact of CVE-2020-2257

The vulnerability can be exploited by attackers with specific permissions to inject and execute malicious scripts, potentially compromising the integrity and security of the Jenkins environment.

Technical Details of CVE-2020-2257

The technical aspects of the CVE provide insight into the vulnerability's description, affected systems, and the exploitation mechanism.

Vulnerability Description

Jenkins Validating String Parameter Plugin 2.4 and earlier versions lack proper escaping mechanisms for user-controlled fields, leading to a stored cross-site scripting vulnerability.

Affected Systems and Versions

Product: Jenkins Validating String Parameter Plugin
Vendor: Jenkins project
Versions Affected: <= 2.4
Version Type: Custom

Exploitation Mechanism

Attackers with Job/Configure permission can exploit the vulnerability by injecting malicious scripts into user-controlled fields, potentially executing unauthorized actions.

Mitigation and Prevention

To address CVE-2020-2257, immediate steps and long-term security practices are crucial for mitigating risks and enhancing system security.

Immediate Steps to Take

Upgrade Jenkins Validating String Parameter Plugin to a patched version above 2.4 to mitigate the vulnerability.
Restrict Job/Configure permissions to trusted users to limit the attack surface.

Long-Term Security Practices

Regularly monitor and audit Jenkins plugins for security vulnerabilities.
Educate users on secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by Jenkins to address known vulnerabilities.