CVE-2018-1000866 Explained : Impact and Mitigation

A vulnerability called sandbox bypass has been identified in Pipeline: Groovy Plugin versions 2.59 and earlier. This vulnerability allows attackers to execute arbitrary code on the Jenkins master JVM.

Understanding CVE-2018-1000866

This CVE involves a sandbox bypass vulnerability in Jenkins Pipeline: Groovy Plugin versions 2.59 and earlier.

What is CVE-2018-1000866?

The vulnerability allows attackers with specific permissions to execute arbitrary code on the Jenkins master JVM.

The Impact of CVE-2018-1000866

Exploiting this vulnerability can lead to unauthorized code execution on the Jenkins master JVM, potentially compromising the entire Jenkins environment.

Technical Details of CVE-2018-1000866

This section provides technical details about the vulnerability.

Vulnerability Description

The vulnerability exists in the files SandboxTransformer.java and SandboxCpsTransformer.java, allowing attackers with Job/Configure permission or unauthorized attackers with SCM commit privileges to execute arbitrary code.

Affected Systems and Versions

Pipeline: Groovy Plugin versions 2.59 and earlier

Exploitation Mechanism

Attackers with Job/Configure permission or unauthorized attackers with SCM commit privileges can exploit this vulnerability to execute arbitrary code on the Jenkins master JVM.

Mitigation and Prevention

Protect your systems from CVE-2018-1000866 with the following steps:

Immediate Steps to Take

Update Jenkins to the latest version
Restrict Job/Configure permissions
Monitor Jenkins pipelines for unauthorized activities

Long-Term Security Practices

Regularly review and update Jenkins security configurations
Educate users on secure Jenkins pipeline practices

Patching and Updates

Apply security patches provided by Jenkins