CVE-2021-21691 Explained : Impact and Mitigation

A critical CVE-2021-21691 has been identified in Jenkins project which allows attackers to create symbolic links without proper access control permission, affecting versions 2.318 and earlier, LTS 2.303.2 and earlier.

Understanding CVE-2021-21691

This section provides an overview of the vulnerability and its impact.

What is CVE-2021-21691?

The CVE-2021-21691 vulnerability in Jenkins allows unauthorized creation of symbolic links due to inadequate access control permission settings.

The Impact of CVE-2021-21691

By exploiting this vulnerability, attackers can manipulate symbolic links without the required 'symlink' agent-to-controller access control permission, potentially leading to unauthorized access and further malicious activities.

Technical Details of CVE-2021-21691

Explore the technical aspects of the CVE-2021-21691 vulnerability.

Vulnerability Description

The vulnerability enables the creation of symbolic links in Jenkins versions 2.318 and earlier, LTS 2.303.2 and earlier, bypassing access control measures.

Affected Systems and Versions

The affected versions include Jenkins 2.318 and prior, as well as LTS 2.303.2 and earlier, leaving instances susceptible to symlink attacks.

Exploitation Mechanism

Attackers can exploit this vulnerability by creating symbolic links without the necessary access control permission, potentially gaining unauthorized system access.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-21691.

Immediate Steps to Take

Administrators should apply immediate security measures to prevent unauthorized access and manipulation of symbolic links.

Long-Term Security Practices

Incorporate robust access control policies and regular security audits to maintain a secure Jenkins environment.

Patching and Updates

Ensure timely installation of security patches and updates provided by Jenkins project to address CVE-2021-21691 and enhance system security.