CVE-2021-21699 : Exploit Details and Defense Strategies
Learn about CVE-2021-21699 affecting Jenkins Active Choices Plugin 2.5.6 and earlier versions. Attackers exploiting this cross-site scripting vulnerability can execute malicious scripts. Find mitigation steps and preventive measures here.
Jenkins Active Choices Plugin 2.5.6 and earlier versions are affected by a stored cross-site scripting (XSS) vulnerability. Attackers with Job/Configure permission can exploit this issue by not escaping the parameter name of reactive parameters and dynamic reference parameters.
Understanding CVE-2021-21699
This section provides detailed insights into the CVE-2021-21699 vulnerability.
What is CVE-2021-21699?
CVE-2021-21699 is a stored cross-site scripting (XSS) vulnerability affecting Jenkins Active Choices Plugin versions 2.5.6 and earlier. Attackers with Job/Configure permission can exploit this issue by taking advantage of unescaped parameter names.
The Impact of CVE-2021-21699
The vulnerability allows attackers to execute malicious scripts in the context of a user's web session, potentially leading to sensitive data theft or unauthorized actions within the application.
Technical Details of CVE-2021-21699
In this section, we delve into the technical aspects of CVE-2021-21699.
Vulnerability Description
The vulnerability arises from the failure to escape the parameter name of reactive parameters and dynamic reference parameters in Jenkins Active Choices Plugin, enabling attackers to inject and execute malicious scripts.
Affected Systems and Versions
Jenkins Active Choices Plugin versions 2.5.6 and earlier are impacted by this vulnerability.
Exploitation Mechanism
To exploit CVE-2021-21699, attackers with Job/Configure permission can input crafted input that contains malicious scripts, bypassing the inadequate input validation mechanisms.
Mitigation and Prevention
This section outlines the steps to mitigate and prevent exploitation of CVE-2021-21699.
Immediate Steps to Take
Users are advised to update Jenkins Active Choices Plugin to a version beyond 2.5.6 to prevent exploitation of this vulnerability. It is crucial to restrict Job/Configure permissions to trusted entities only.
Long-Term Security Practices
Implement strict input validation mechanisms, conduct regular security audits, and educate users on safe coding practices to enhance overall application security.
Patching and Updates
Stay informed about security advisories and promptly apply patches released by Jenkins project to address security vulnerabilities and enhance the resilience of the application.