CVE-2017-1000399 : Exploit Details and Defense Strategies

Jenkins versions 2.73.1 and 2.83 and earlier had a vulnerability in the remote API endpoint that exposed task details in the queue to unauthorized users. This issue has been addressed in newer versions.

Understanding CVE-2017-1000399

This CVE entry highlights a security vulnerability in Jenkins versions 2.73.1 and 2.83 and earlier related to the remote API endpoint.

What is CVE-2017-1000399?

Prior to versions 2.73.1 and 2.83 of Jenkins, the remote API endpoint exposed task details in the queue, including builds waiting to start, to users without proper authorization. This could reveal information about tasks inaccessible to the user due to permission restrictions.

The Impact of CVE-2017-1000399

This vulnerability could potentially lead to unauthorized access to sensitive information about tasks in the queue, compromising the confidentiality of the build process and potentially exposing critical data to unauthorized parties.

Technical Details of CVE-2017-1000399

This section delves into the technical aspects of the CVE.

Vulnerability Description

The Jenkins 2.73.1 and earlier, 2.83 and earlier remote API at /queue/item/(ID)/api displayed task information in the queue, even for tasks that the user lacked access to, such as due to Item/Read permission limitations. The issue has been fixed, restricting the API endpoint to authorized tasks only.

Affected Systems and Versions

Jenkins versions 2.73.1 and earlier
Jenkins versions 2.83 and earlier

Exploitation Mechanism

Unauthorized users could exploit this vulnerability by accessing the /queue/item/(ID)/api endpoint to gather information about tasks in the queue that they were not supposed to have access to.

Mitigation and Prevention

Protecting systems from CVE-2017-1000399 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Jenkins to versions 2.73.1 or 2.83 or later to mitigate the vulnerability.
Restrict access to the /queue/item/(ID)/api endpoint to authorized users only.

Long-Term Security Practices

Regularly update Jenkins to the latest versions to ensure security patches are applied promptly.
Implement least privilege access controls to restrict user permissions and access to sensitive endpoints.
Conduct regular security audits and vulnerability assessments to identify and address potential security gaps.

Patching and Updates

Ensure timely patching and updates for Jenkins to address known vulnerabilities and enhance overall system security.