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CVE-2021-21686 Explained : Impact and Mitigation

Learn about CVE-2021-21686 affecting Jenkins versions 2.318 and earlier, LTS 2.303.2 and earlier. Explore its impact, technical details, and mitigation strategies.

A detailed overview of CVE-2021-21686 focusing on the impact, technical details, and mitigation strategies.

Understanding CVE-2021-21686

This section provides insight into the vulnerability and its implications.

What is CVE-2021-21686?

The vulnerability lies in the file path filters in the agent-to-controller security subsystem of Jenkins versions 2.318 and earlier, LTS 2.303.2 and earlier. It allows operations to traverse symbolic links to directories outside the permitted ones.

The Impact of CVE-2021-21686

The vulnerability can be exploited to access unauthorized directories through path traversal, potentially leading to unauthorized data disclosure or manipulation.

Technical Details of CVE-2021-21686

Explore the specifics of the vulnerability in this section.

Vulnerability Description

File path filters in Jenkins versions 2.318 and earlier, LTS 2.303.2 and earlier do not properly canonicalize paths, enabling symbolic link traversal to restricted directories.

Affected Systems and Versions

The vulnerability affects Jenkins versions 2.318 and below, as well as LTS 2.303.2 and earlier.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging symbolic links to navigate to directories outside the intended scope.

Mitigation and Prevention

Discover strategies to mitigate the risks associated with CVE-2021-21686.

Immediate Steps to Take

It is crucial to update Jenkins to a patched version that addresses the path traversal vulnerability. Additionally, restrict access and permissions to essential directories.

Long-Term Security Practices

Implement strict path restrictions, regularly monitor and audit file system accesses, and educate users on secure coding practices to prevent similar issues.

Patching and Updates

Stay informed about security advisories from Jenkins project and promptly apply patches and updates to secure your systems against known vulnerabilities.

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