CVE-2021-21664 : Exploit Details and Defense Strategies

A security vulnerability in Jenkins XebiaLabs XL Deploy Plugin version 10.0.1 and earlier could allow attackers with specific permissions to access URLs with arbitrary credentials. This CVE was published on June 10, 2021, by Jenkins project.

Understanding CVE-2021-21664

This CVE identifies an incorrect permission check issue that could lead to unauthorized access.

What is CVE-2021-21664?

CVE-2021-21664 is a security flaw in Jenkins XebiaLabs XL Deploy Plugin versions before 10.0.1, allowing attackers with specific permissions to connect to a specified URL with obtained credentials.

The Impact of CVE-2021-21664

The vulnerability could be exploited by attackers with Generic Create permission to capture sensitive credentials stored in Jenkins, leading to potential data breaches.

Technical Details of CVE-2021-21664

This section provides a deeper insight into the vulnerability.

Vulnerability Description

The flaw involves an incorrect permission check that enables attackers to use arbitrary credentials to access URLs.

Affected Systems and Versions

Jenkins XebiaLabs XL Deploy Plugin versions including 7.5.9 up to 10.0.1 are impacted by this vulnerability.

Exploitation Mechanism

Attackers with Generic Create permission can exploit this vulnerability by connecting to a specific URL with acquired credentials.

Mitigation and Prevention

Understanding the necessary steps to secure your systems.

Immediate Steps to Take

Update the Jenkins XebiaLabs XL Deploy Plugin to version 10.0.1 or later.
Monitor and review user permissions within Jenkins to restrict unauthorized access.

Long-Term Security Practices

Conduct regular security audits and vulnerability assessments on your Jenkins environment.
Educate users on best security practices to prevent unauthorized access.

Patching and Updates

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