CVE-2021-21618 : Security Advisory and Response
Learn about CVE-2021-21618, a stored cross-site scripting (XSS) vulnerability in Jenkins Repository Connector Plugin versions <= 2.0.2. Understand the impact, technical details, and mitigation steps.
Jenkins Repository Connector Plugin 2.0.2 and earlier versions have a stored cross-site scripting (XSS) vulnerability. Attackers with Item/Configure permission can exploit this issue.
Understanding CVE-2021-21618
This CVE relates to a security vulnerability found in Jenkins Repository Connector Plugin versions 2.0.2 and earlier.
What is CVE-2021-21618?
The vulnerability in Jenkins Repository Connector Plugin allows attackers with specific permissions to execute stored cross-site scripting attacks.
The Impact of CVE-2021-21618
This vulnerability can be exploited by malicious actors with the Item/Configure permission, potentially leading to unauthorized access and data manipulation.
Technical Details of CVE-2021-21618
This section dives into the specific technical aspects of the CVE.
Vulnerability Description
Jenkins Repository Connector Plugin versions 2.0.2 and earlier fail to properly escape parameter names and descriptions for past builds, creating an opportunity for stored cross-site scripting attacks.
Affected Systems and Versions
The affected systems include installations running Jenkins Repository Connector Plugin versions 2.0.2 and earlier.
Exploitation Mechanism
Attackers with Item/Configure permission can exploit this vulnerability to inject malicious scripts into parameters, leading to XSS attacks.
Mitigation and Prevention
To safeguard your systems from CVE-2021-21618, follow the mitigation and preventive measures below.
Immediate Steps to Take
- Upgrade Jenkins Repository Connector Plugin to a version beyond 2.0.2 to eliminate the vulnerability.
- Restrict access permissions to minimize the impact of potential attacks.
Long-Term Security Practices
- Regularly update and patch all plugins and software components within your Jenkins environment.
- Implement a robust security policy to control permissions and access levels effectively.
Patching and Updates
Stay informed about security advisories and updates from Jenkins to address vulnerabilities promptly.