CVE-2020-2254 : Exploit Details and Defense Strategies

Jenkins Blue Ocean Plugin 1.23.2 and earlier versions contain a security vulnerability that could allow an attacker to read arbitrary files on the Jenkins controller file system.

Understanding CVE-2020-2254

This CVE affects the Jenkins Blue Ocean Plugin, specifically versions 1.23.2 and earlier.

What is CVE-2020-2254?

This CVE refers to an undocumented feature flag in Jenkins Blue Ocean Plugin that, when activated, permits an attacker with specific permissions to access files on the Jenkins controller system.

The Impact of CVE-2020-2254

The vulnerability could be exploited by an attacker with Job/Configure or Job/Create permissions to read sensitive files on the Jenkins controller, potentially leading to unauthorized access and data leakage.

Technical Details of CVE-2020-2254

Jenkins Blue Ocean Plugin 1.23.2 and earlier versions are susceptible to this security flaw.

Vulnerability Description

The issue arises from an undocumented feature flag that, when enabled, allows unauthorized file access on the Jenkins controller system.

Affected Systems and Versions

Product: Jenkins Blue Ocean Plugin
Vendor: Jenkins project
Vulnerable Versions: <= 1.23.2 (custom version), ! 1.19.2

Exploitation Mechanism

The vulnerability can be exploited by an attacker with Job/Configure or Job/Create permissions to read arbitrary files on the Jenkins controller file system.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2020-2254.

Immediate Steps to Take

Disable the undocumented feature flag in Jenkins Blue Ocean Plugin.
Monitor and restrict permissions for Job/Configure and Job/Create roles.

Long-Term Security Practices

Regularly update Jenkins and its plugins to the latest versions.
Implement least privilege access controls to limit file system access.

Patching and Updates

Apply patches or updates provided by Jenkins project to fix the vulnerability and enhance system security.