CVE-2021-21657 : Vulnerability Insights and Analysis

Jenkins Filesystem Trigger Plugin version 0.40 and earlier are vulnerable to XML external entity (XXE) attacks due to improper XML parser configuration.

Understanding CVE-2021-21657

This CVE record describes a vulnerability in Jenkins Filesystem Trigger Plugin that allows attackers to exploit XML external entity (XXE) attacks.

What is CVE-2021-21657?

The vulnerability in Jenkins Filesystem Trigger Plugin version 0.40 and earlier arises from the lack of proper configuration in its XML parser, leaving it susceptible to XXE attacks.

The Impact of CVE-2021-21657

Exploitation of this vulnerability can lead to unauthorized access, sensitive data exposure, and potential further attacks on affected systems.

Technical Details of CVE-2021-21657

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

Jenkins Filesystem Trigger Plugin versions 0.40 and earlier fail to secure against XML external entity (XXE) attacks due to an improperly configured XML parser.

Affected Systems and Versions

The impacted systems are those running Jenkins Filesystem Trigger Plugin with versions less than or equal to 0.40.

Exploitation Mechanism

Attackers can leverage the XXE vulnerability to manipulate XML input and gain unauthorized access to sensitive data within the affected systems.

Mitigation and Prevention

Mitigation steps and best practices to enhance the security posture.

Immediate Steps to Take

Users are advised to update the Jenkins Filesystem Trigger Plugin to a version that addresses the XXE vulnerability immediately.

Long-Term Security Practices

Regularly updating plugins and ensuring XML parser configurations adhere to security best practices can help prevent such vulnerabilities.

Patching and Updates

Stay informed about security advisories and apply patches promptly to safeguard against known vulnerabilities.