CVE-2017-1000393 : Security Advisory and Response

Jenkins users with specific versions and permissions were exposed to a vulnerability allowing the execution of arbitrary shell commands on the master node.

Understanding CVE-2017-1000393

This CVE highlights a security issue in Jenkins versions 2.73.1 and earlier, as well as 2.83 and earlier, affecting users with agent creation or modification authorization.

What is CVE-2017-1000393?

Users with the ability to create or modify agents in Jenkins could configure a launch method named 'Launch agent via execution of command on master,' enabling the execution of shell commands on the master node.

The Impact of CVE-2017-1000393

This vulnerability allowed unauthorized users to run arbitrary shell commands on the master node, potentially leading to unauthorized access and malicious activities.

Technical Details of CVE-2017-1000393

Jenkins versions 2.73.1 and earlier, 2.83 and earlier were affected by this vulnerability.

Vulnerability Description

The issue allowed users to execute shell commands on the master node through a specific launch method, bypassing normal security restrictions.

Affected Systems and Versions

Jenkins versions 2.73.1 and earlier
Jenkins versions 2.83 and earlier

Exploitation Mechanism

Users with agent creation or modification permissions could exploit the vulnerability by configuring the 'Launch agent via execution of command on master' method.

Mitigation and Prevention

Steps to address and prevent the CVE-2017-1000393 vulnerability.

Immediate Steps to Take

Upgrade Jenkins to a patched version that addresses the vulnerability.
Restrict permissions for agent creation and modification to trusted users only.

Long-Term Security Practices

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

Patching and Updates

Ensure timely installation of security patches and updates for Jenkins to mitigate known vulnerabilities.