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CVE-2021-21638 : Security Advisory and Response

Learn about CVE-2021-21638, a CSRF vulnerability in Jenkins Team Foundation Server Plugin versions before 5.157.1. Understand the impact, technical details, and mitigation steps.

A detailed overview of the CSRF vulnerability in Jenkins Team Foundation Server Plugin 5.157.1 and earlier versions.

Understanding CVE-2021-21638

This CVE describes a Cross-Site Request Forgery (CSRF) vulnerability in the Jenkins Team Foundation Server Plugin, allowing attackers to access a specified URL using obtained credentials.

What is CVE-2021-21638?

CVE-2021-21638 is a CSRF vulnerability in Jenkins Team Foundation Server Plugin versions earlier than 5.157.1. Attackers can exploit this flaw to connect to a specific URL with acquired credentials.

The Impact of CVE-2021-21638

This vulnerability enables malicious actors to gather stored credentials in Jenkins by manipulating user interaction and executing unauthorized actions remotely.

Technical Details of CVE-2021-21638

A look into the specifics of the vulnerability, affected systems, and how it can be exploited.

Vulnerability Description

The CSRF flaw in Jenkins TF Server Plugin allows attackers to access specified URLs using user credentials obtained through other means, compromising Jenkins stored data.

Affected Systems and Versions

Jenkins TF Server Plugin versions less than or equal to 5.157.1 are impacted by this vulnerability.

Exploitation Mechanism

Malicious entities can exploit this vulnerability by manipulating user sessions to perform unauthorized actions through CSRF attacks.

Mitigation and Prevention

Measures to address and prevent the exploitation of CVE-2021-21638.

Immediate Steps to Take

Jenkins users should update the TF Server Plugin to a patched version to mitigate the CSRF vulnerability and enhance security.

Long-Term Security Practices

Employ security best practices such as employing secure coding standards, implementing robust authentication mechanisms, and continuous security monitoring.

Patching and Updates

Regularly monitor for security advisories and apply patches promptly to ensure the protection of Jenkins instances.

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