CVE-2020-2103 : Security Advisory and Response

Jenkins 2.218 and earlier, LTS 2.204.1 and earlier exposed session identifiers on a user's detail object in the whoAmI diagnostic page.

Understanding CVE-2020-2103

Jenkins vulnerability exposing session identifiers.

What is CVE-2020-2103?

CVE-2020-2103 is a vulnerability in Jenkins versions 2.218 and earlier, LTS 2.204.1 and earlier, where session identifiers were exposed on a user's detail object in the whoAmI diagnostic page.

The Impact of CVE-2020-2103

This vulnerability could allow attackers to access sensitive session information, potentially leading to unauthorized access or other security breaches.

Technical Details of CVE-2020-2103

Details of the vulnerability in Jenkins.

Vulnerability Description

Jenkins versions 2.218 and earlier, LTS 2.204.1 and earlier exposed session identifiers on a user's detail object in the whoAmI diagnostic page, potentially compromising user session security.

Affected Systems and Versions

Affected Versions: Jenkins <= 2.218, LTS <= 2.204.1
Products: Jenkins

Exploitation Mechanism

Attackers could exploit this vulnerability by accessing the whoAmI diagnostic page to retrieve session identifiers, potentially leading to unauthorized access.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2020-2103 vulnerability.

Immediate Steps to Take

Upgrade Jenkins to a non-vulnerable version above 2.218 or LTS 2.204.1.
Monitor user sessions for any suspicious activity.
Restrict access to the whoAmI diagnostic page.

Long-Term Security Practices

Regularly update Jenkins to the latest version to patch known vulnerabilities.
Implement strong authentication mechanisms and access controls.
Conduct regular security audits and penetration testing.

Patching and Updates

Apply security patches provided by Jenkins to address the vulnerability.