CVE-2019-10394 : Exploit Details and Defense Strategies

The Jenkins Script Security Plugin version 1.62 and earlier had a vulnerability that allowed attackers to execute arbitrary code in sandboxed scripts.

Understanding CVE-2019-10394

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

What is CVE-2019-10394?

This vulnerability allowed attackers to execute arbitrary code in sandboxed scripts by exploiting the way property names were handled in property expressions.

The Impact of CVE-2019-10394

The vulnerability enabled a sandbox bypass technique, posing a significant security risk to systems using affected versions of the plugin.

Technical Details of CVE-2019-10394

The following technical details provide insight into the specifics of this CVE.

Vulnerability Description

The vulnerability in Jenkins Script Security Plugin 1.62 and earlier allowed for the execution of arbitrary code in sandboxed scripts due to improper handling of property names in property expressions.

Affected Systems and Versions

Product: Jenkins Script Security Plugin
Vendor: Jenkins project
Versions Affected: 1.62 and earlier

Exploitation Mechanism

The exploitation involved manipulating property names in property expressions on the left side of assignment expressions to execute arbitrary code in sandboxed scripts.

Mitigation and Prevention

To address and prevent the exploitation of CVE-2019-10394, consider the following steps:

Immediate Steps to Take

Update the Jenkins Script Security Plugin to a non-vulnerable version.
Monitor for any signs of unauthorized code execution.

Long-Term Security Practices

Regularly review and update security configurations.
Implement code review processes to detect and mitigate vulnerabilities.

Patching and Updates

Apply security patches and updates promptly to ensure protection against known vulnerabilities.