CVE-2019-16538 : Security Advisory and Response

A vulnerability in Jenkins Script Security Plugin 1.67 and earlier allowed attackers to execute arbitrary code in sandboxed scripts.

Understanding CVE-2019-16538

This CVE involves a sandbox bypass vulnerability in the Jenkins Script Security Plugin.

What is CVE-2019-16538?

Attackers could run arbitrary code in sandboxed scripts due to a flaw in handling default parameter expressions in closures.

The Impact of CVE-2019-16538

The vulnerability enabled attackers to execute unauthorized code within the Jenkins environment, potentially leading to system compromise.

Technical Details of CVE-2019-16538

The following technical aspects are associated with this CVE:

Vulnerability Description

The flaw in Jenkins Script Security Plugin 1.67 and earlier allowed for the execution of arbitrary code in sandboxed scripts.

Affected Systems and Versions

Product: Jenkins Script Security Plugin
Vendor: Jenkins project
Versions Affected: 1.67 and earlier

Exploitation Mechanism

The vulnerability was exploited by manipulating default parameter expressions in closures to execute unauthorized code.

Mitigation and Prevention

Steps to address and prevent exploitation of this vulnerability:

Immediate Steps to Take

Update Jenkins Script Security Plugin to a non-vulnerable version.
Monitor for any unauthorized script executions.

Long-Term Security Practices

Regularly review and update Jenkins plugins to the latest secure versions.
Implement strict code review processes for scripts and plugins.

Patching and Updates

Apply security patches promptly to Jenkins and associated plugins to mitigate known vulnerabilities.