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CVE-2021-21636 Explained : Impact and Mitigation

Learn about CVE-2021-21636, a critical vulnerability in Jenkins Team Foundation Server Plugin allowing unauthorized access. Find mitigation steps and best practices for enhanced security.

A missing permission check in Jenkins Team Foundation Server Plugin 5.157.1 and earlier allows attackers with Overall/Read permission to enumerate credentials ID of credentials stored in Jenkins.

Understanding CVE-2021-21636

This CVE impacts Jenkins Team Foundation Server Plugin versions less than or equal to 5.157.1, allowing unauthorized access to credentials ID.

What is CVE-2021-21636?

The vulnerability in Jenkins Team Foundation Server Plugin permits attackers with Overall/Read permission to discover credentials ID stored in Jenkins, potentially leading to unauthorized access.

The Impact of CVE-2021-21636

Due to this vulnerability, malicious actors can exploit the permission check flaw to gain access to sensitive credential information, posing a significant security risk to Jenkins users and their data.

Technical Details of CVE-2021-21636

This section provides detailed technical information about the vulnerability.

Vulnerability Description

CVE-2021-21636 is classified under CWE-862 as a Missing Authorization vulnerability. It specifically affects Jenkins Team Foundation Server Plugin versions less than or equal to 5.157.1.

Affected Systems and Versions

The vulnerability impacts Jenkins Team Foundation Server Plugin versions less than or equal to 5.157.1.

Exploitation Mechanism

Attackers with Overall/Read permission can exploit this vulnerability to enumerate credentials ID of stored credentials in Jenkins, potentially leading to unauthorized access.

Mitigation and Prevention

To safeguard systems from CVE-2021-21636, prompt actions and long-term security measures are essential.

Immediate Steps to Take

Users are advised to update Jenkins Team Foundation Server Plugin to versions beyond 5.157.1 to mitigate the vulnerability. Additionally, reviewing and restricting permissions can help limit potential exploitation.

Long-Term Security Practices

Implementing a robust security policy, regular security training for users, and maintaining up-to-date software versions can enhance overall system security.

Patching and Updates

Regularly monitoring for security advisories and applying patches promptly is crucial to prevent exploitation of known vulnerabilities.

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