CVE-2020-2289 : Exploit Details and Defense Strategies

Jenkins Active Choices Plugin 2.4 and earlier versions are vulnerable to stored cross-site scripting (XSS) attacks due to improper input neutralization.

Understanding CVE-2020-2289

Jenkins Active Choices Plugin versions 2.1 to 2.4 are affected by a stored XSS vulnerability that can be exploited by attackers with Job/Configure permission.

What is CVE-2020-2289?

This CVE refers to a security flaw in Jenkins Active Choices Plugin versions 2.4 and earlier, allowing attackers to execute stored cross-site scripting attacks.

The Impact of CVE-2020-2289

The vulnerability enables malicious actors with Job/Configure permission to inject and execute arbitrary scripts within the context of the affected Jenkins instance, potentially leading to unauthorized actions.

Technical Details of CVE-2020-2289

Jenkins Active Choices Plugin vulnerability details.

Vulnerability Description

The issue arises from the plugin's failure to properly escape the name and description of build parameters, facilitating XSS attacks.

Affected Systems and Versions

Jenkins Active Choices Plugin version 2.1 (custom)
Jenkins Active Choices Plugin versions up to 2.4

Exploitation Mechanism

Attackers with Job/Configure permission can exploit the vulnerability by injecting malicious scripts into build parameters, leading to XSS attacks.

Mitigation and Prevention

Protect your systems from CVE-2020-2289.

Immediate Steps to Take

Upgrade Jenkins Active Choices Plugin to a patched version.
Restrict Job/Configure permissions to trusted users.
Regularly monitor and audit Jenkins configurations for unauthorized changes.

Long-Term Security Practices

Implement input validation mechanisms to sanitize user inputs.
Educate users on secure coding practices to prevent XSS vulnerabilities.
Stay informed about security advisories and promptly apply patches.

Patching and Updates

Ensure timely installation of security patches and updates for Jenkins and its plugins to address known vulnerabilities.