CVE-2020-2220 : What You Need to Know

Jenkins 2.244 and earlier, LTS 2.235.1 and earlier versions are affected by a stored cross-site scripting vulnerability due to improper handling of agent names in the build time trend page.

Understanding CVE-2020-2220

This CVE affects Jenkins instances that have not properly escaped agent names, leading to a security risk.

What is CVE-2020-2220?

CVE-2020-2220 is a vulnerability in Jenkins versions 2.244 and earlier, LTS 2.235.1 and earlier, allowing stored cross-site scripting attacks.

The Impact of CVE-2020-2220

The vulnerability could be exploited by attackers to inject malicious scripts into Jenkins pages, potentially leading to unauthorized access or data theft.

Technical Details of CVE-2020-2220

Jenkins 2.244 and earlier, LTS 2.235.1 and earlier are susceptible to stored cross-site scripting due to unescaped agent names.

Vulnerability Description

The issue arises from the failure to properly escape agent names in the build time trend page, enabling attackers to execute malicious scripts.

Affected Systems and Versions

Jenkins versions <= 2.244
LTS versions <= 2.235.1

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts into Jenkins pages through unescaped agent names.

Mitigation and Prevention

It is crucial to take immediate steps to secure Jenkins instances and prevent potential attacks.

Immediate Steps to Take

Update Jenkins to the latest patched version that addresses the vulnerability.
Implement input validation and output encoding to mitigate cross-site scripting risks.

Long-Term Security Practices

Regularly monitor and audit Jenkins configurations for security vulnerabilities.
Educate users on secure coding practices to prevent cross-site scripting attacks.

Patching and Updates

Apply security patches promptly to ensure Jenkins is protected against known vulnerabilities.