CVE-2021-21608 : Security Advisory and Response

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier versions are affected by a cross-site scripting (XSS) vulnerability due to the lack of escaping button labels in the Jenkins UI. Attackers with the ability to control button labels can exploit this issue.

Understanding CVE-2021-21608

This section provides insights into the vulnerability and its impacts, along with technical details.

What is CVE-2021-21608?

CVE-2021-21608 is a vulnerability in Jenkins versions 2.274 and earlier, LTS 2.263.1 and earlier, allowing attackers to execute cross-site scripting attacks by manipulating button labels.

The Impact of CVE-2021-21608

The vulnerability poses a risk of unauthorized access and data manipulation to systems running affected versions of Jenkins, potentially compromising the integrity of user data and system operations.

Technical Details of CVE-2021-21608

Learn more about the specifics of the vulnerability in this section.

Vulnerability Description

The vulnerability arises from the failure to properly escape button labels in the Jenkins UI, enabling malicious actors to inject and execute arbitrary scripts within the context of the user's browser.

Affected Systems and Versions

Jenkins versions 2.274 and earlier, LTS 2.263.1 and earlier are confirmed to be impacted by this XSS vulnerability, emphasizing the importance of timely mitigation.

Exploitation Mechanism

By manipulating button labels in the Jenkins UI, threat actors can inject malicious scripts, leading to unauthorized script execution and potential data theft or system compromise.

Mitigation and Prevention

Discover the steps to mitigate and prevent the exploitation of CVE-2021-21608.

Immediate Steps to Take

Users are advised to update their Jenkins installations to non-vulnerable versions, implement security best practices, and monitor for any signs of unauthorized access or malicious activity.

Long-Term Security Practices

Incorporate secure coding practices, regular security assessments, and employee training to bolster the overall security posture and mitigate XSS vulnerabilities effectively.

Patching and Updates

Stay informed about security patches and updates released by Jenkins to address vulnerabilities promptly and secure your systems against potential exploits.