CVE-2020-2106 Explained : Impact and Mitigation

Jenkins Code Coverage API Plugin 1.1.2 and earlier versions are affected by a stored XSS vulnerability due to improper handling of filenames in coverage reports.

Understanding CVE-2020-2106

This CVE identifies a security issue in Jenkins Code Coverage API Plugin versions 1.1.2 and below.

What is CVE-2020-2106?

This vulnerability allows users with job configuration permissions to exploit a stored XSS vulnerability by manipulating the coverage report filenames.

The Impact of CVE-2020-2106

The vulnerability could be exploited by malicious users to execute arbitrary scripts within the context of the Jenkins application, potentially leading to unauthorized actions.

Technical Details of CVE-2020-2106

Jenkins Code Coverage API Plugin is susceptible to a stored XSS vulnerability due to inadequate filename escaping.

Vulnerability Description

The plugin fails to properly escape filenames in coverage reports, enabling attackers to inject malicious scripts.

Affected Systems and Versions

Product: Jenkins Code Coverage API Plugin
Vendor: Jenkins project
Versions Affected: <= 1.1.2 (unspecified version type)

Exploitation Mechanism

Attackers with the ability to modify job configurations can exploit this vulnerability by manipulating coverage report filenames.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2020-2106.

Immediate Steps to Take

Upgrade Jenkins Code Coverage API Plugin to a patched version.
Restrict job configuration permissions to trusted users.
Monitor and review job configurations for any unauthorized changes.

Long-Term Security Practices

Regularly update Jenkins and its plugins to the latest secure versions.
Implement security training for users with job configuration privileges.

Patching and Updates

Ensure timely installation of security patches and updates provided by Jenkins to mitigate the vulnerability.