CVE-2019-10406 Explained : Impact and Mitigation

Jenkins 2.196 and earlier, as well as LTS 2.176.3 and earlier, had a stored cross-site scripting (XSS) vulnerability due to unrestricted values set as the Jenkins URL in the global configuration.

Understanding CVE-2019-10406

This CVE affects Jenkins instances with specific versions, allowing attackers with Overall/Administer permission to exploit a stored XSS vulnerability.

What is CVE-2019-10406?

Versions of Jenkins before 2.196 and LTS versions before 2.176.3 lacked proper filtering on Jenkins URL values, enabling a stored XSS vulnerability.

The Impact of CVE-2019-10406

The vulnerability could be exploited by malicious users with Overall/Administer permission, potentially leading to unauthorized access, data theft, or further attacks.

Technical Details of CVE-2019-10406

Jenkins 2.196 and earlier, LTS 2.176.3 and earlier were affected by this vulnerability.

Vulnerability Description

The issue stemmed from the lack of restrictions on values set as the Jenkins URL, allowing for stored XSS attacks.

Affected Systems and Versions

Product: Jenkins
Vendor: Jenkins project
Versions: 2.196 and earlier, LTS 2.176.3 and earlier

Exploitation Mechanism

Attackers with Overall/Administer permission could exploit the vulnerability by injecting malicious scripts via the Jenkins URL.

Mitigation and Prevention

It is crucial to take immediate steps to secure Jenkins instances and prevent exploitation.

Immediate Steps to Take

Update Jenkins to the latest patched version immediately.
Restrict Overall/Administer permissions to trusted users only.
Regularly monitor Jenkins configurations for unauthorized changes.

Long-Term Security Practices

Implement strict input validation and output encoding in Jenkins configurations.
Educate users on safe URL handling practices to prevent XSS attacks.

Patching and Updates

Apply security patches and updates provided by Jenkins promptly to address the vulnerability and enhance system security.