CVE-2019-1003024 : Exploit Details and Defense Strategies

The Jenkins Script Security Plugin versions 1.52 and earlier are vulnerable to a sandbox bypass, allowing attackers to execute arbitrary code on the Jenkins master JVM.

Understanding CVE-2019-1003024

This CVE involves a critical vulnerability in the Jenkins Script Security Plugin that can be exploited by attackers with specific permissions.

What is CVE-2019-1003024?

This vulnerability in the RejectASTTransformsCustomizer.java file enables attackers with Overall/Read permission to provide a Groovy script to an HTTP endpoint, leading to the execution of unauthorized code on the Jenkins master JVM.

The Impact of CVE-2019-1003024

The vulnerability poses a significant risk as it allows attackers to bypass the sandbox restrictions and execute malicious code on the Jenkins server, potentially compromising the entire system.

Technical Details of CVE-2019-1003024

This section provides detailed technical information about the CVE.

Vulnerability Description

The Jenkins Script Security Plugin versions 1.52 and earlier contain a sandbox bypass vulnerability in the RejectASTTransformsCustomizer.java file, enabling unauthorized code execution.

Affected Systems and Versions

Product: Jenkins Script Security Plugin
Vendor: Jenkins project
Vulnerable Versions: 1.52 and earlier

Exploitation Mechanism

Attackers with Overall/Read permission can provide a Groovy script to an HTTP endpoint.
This action can result in the execution of arbitrary code on the Jenkins master JVM.

Mitigation and Prevention

Protecting systems from CVE-2019-1003024 requires immediate action and long-term security practices.

Immediate Steps to Take

Update the Jenkins Script Security Plugin to a non-vulnerable version.
Restrict access permissions to prevent unauthorized users from providing scripts to HTTP endpoints.

Long-Term Security Practices

Regularly monitor and update Jenkins plugins to ensure the latest security patches are applied.
Implement strict access controls and least privilege principles to limit the impact of potential vulnerabilities.

Patching and Updates

Stay informed about security advisories from Jenkins and promptly apply recommended patches to mitigate known vulnerabilities.