CVE-2017-1000504 : Exploit Details and Defense Strategies

A potential issue concerning the order of command execution during the initialization process has been identified in Jenkins versions 2.94 and earlier, as well as 2.89.1 and earlier. This issue, known as a race condition, occurs shortly after Jenkins starts up. While the message indicating that Jenkins is preparing to work may no longer be displayed, it is possible that the Cross-Site Request Forgery (CSRF) protection is not fully functional during this small timeframe.

Understanding CVE-2017-1000504

This CVE involves a race condition in Jenkins that could lead to the wrong order of command execution during initialization.

What is CVE-2017-1000504?

A race condition during Jenkins 2.94 and earlier; 2.89.1 and earlier startup could result in the wrong order of execution of commands during initialization. There is a very short window of time after startup during which Jenkins may no longer show the 'Please wait while Jenkins is getting ready to work' message but Cross-Site Request Forgery (CSRF) protection may not yet be effective.

The Impact of CVE-2017-1000504

Allows for potential manipulation of command execution order during Jenkins initialization
CSRF protection may not be fully functional during a specific timeframe after startup

Technical Details of CVE-2017-1000504

This section provides technical insights into the vulnerability.

Vulnerability Description

The vulnerability involves a race condition in Jenkins versions 2.94 and earlier, as well as 2.89.1 and earlier, affecting the order of command execution during initialization.

Affected Systems and Versions

Jenkins versions 2.94 and earlier
Jenkins versions 2.89.1 and earlier

Exploitation Mechanism

The issue occurs shortly after Jenkins starts up, creating a small timeframe where the command execution order may be incorrect, and CSRF protection may not be fully operational.

Mitigation and Prevention

Protecting systems from CVE-2017-1000504 is crucial to maintaining security.

Immediate Steps to Take

Update Jenkins to the latest version available
Monitor Jenkins startup closely for any unusual behavior
Implement additional security measures to mitigate CSRF vulnerabilities

Long-Term Security Practices

Regularly update Jenkins and all associated plugins
Conduct security audits to identify and address vulnerabilities proactively

Patching and Updates

Apply patches provided by Jenkins to address the race condition vulnerability