CVE-2021-21640 : What You Need to Know

Jenkins 2.286 and earlier, LTS 2.277.1 and earlier versions have a vulnerability that allows attackers with View/Create permission to create views with invalid or already-used names.

Understanding CVE-2021-21640

This CVE affects the Jenkins project, impacting specific versions of Jenkins.

What is CVE-2021-21640?

CVE-2021-21640 is a security vulnerability in Jenkins versions 2.286 and earlier, LTS 2.277.1 and earlier, where the system fails to properly validate newly created view names, enabling attackers to create views with unauthorized names.

The Impact of CVE-2021-21640

The vulnerability could be exploited by malicious users with View/Create permissions to create views with names that could potentially disrupt the system's functionality or compromise security.

Technical Details of CVE-2021-21640

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Jenkins 2.286 and earlier, LTS 2.277.1 and earlier do not adequately verify the legitimacy of newly created view names, allowing users to generate views with names that are already in use or invalid.

Affected Systems and Versions

The affected systems include versions of Jenkins up to 2.286 and LTS up to 2.277.1.

Exploitation Mechanism

Attackers with View/Create permissions can exploit this vulnerability by creating views using unauthorized or duplicate names.

Mitigation and Prevention

To safeguard your system from CVE-2021-21640, consider the following mitigation strategies.

Immediate Steps to Take

Ensure that users with View/Create permissions adhere to naming conventions to prevent the creation of views with unauthorized names.

Long-Term Security Practices

Regularly review and update access permissions to limit the risk of unauthorized actions within Jenkins environments.

Patching and Updates

Keep Jenkins updated with the latest patches and versions to mitigate known vulnerabilities and enhance system security.