CVE-2019-10401 Explained : Impact and Mitigation
Learn about CVE-2019-10401 affecting Jenkins versions prior to 2.196 and LTS 2.176.3. Find out how users with specific permissions can exploit a stored XSS vulnerability in the f:expandableTextBox form control.
Jenkins 2.196 and LTS 2.176.3 and earlier versions are affected by a stored XSS vulnerability in the f:expandableTextBox form control, allowing users with specific permissions to exploit the issue.
Understanding CVE-2019-10401
This CVE identifies a security vulnerability in Jenkins versions prior to 2.196 and LTS 2.176.3.
What is CVE-2019-10401?
Prior to Jenkins 2.196 and LTS 2.176.3, the f:expandableTextBox form control had a vulnerability that allowed users with permission to define its contents to exploit a stored XSS vulnerability. The issue occurred when the content was interpreted as HTML upon expansion.
The Impact of CVE-2019-10401
The vulnerability could be exploited by users with permission to define the form control's content, potentially leading to stored XSS attacks.
Technical Details of CVE-2019-10401
Jenkins 2.196 and earlier, LTS 2.176.3 and earlier versions are susceptible to this vulnerability.
Vulnerability Description
The f:expandableTextBox form control in affected Jenkins versions interprets content as HTML when expanded, creating a stored XSS risk for users with specific permissions.
Affected Systems and Versions
- Product: Jenkins
- Vendor: Jenkins project
- Vulnerable Versions: 2.196 and earlier, LTS 2.176.3 and earlier
Exploitation Mechanism
Users with permission to define the form control's content, typically in Job/Configure settings, can exploit the vulnerability by inserting malicious content that gets interpreted as HTML.
Mitigation and Prevention
It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-10401.
Immediate Steps to Take
- Upgrade Jenkins to a non-vulnerable version (2.196 or later, LTS 2.176.3 or later).
- Restrict access to the affected form control to authorized users only.
- Regularly monitor and audit configurations for any unauthorized changes.
Long-Term Security Practices
- Educate users on secure coding practices to prevent XSS vulnerabilities.
- Implement a robust permission management system to control access to critical functionalities.
Patching and Updates
- Apply security patches provided by Jenkins to fix the vulnerability.
- Stay informed about security advisories and updates from Jenkins project.