CVE-2023-41947 - Jenkins Frugal Testing Plugin Security Vulnerability Uncovered: Missing Permission Check Risks Unauthorized Access

The open-source automation server, Jenkins, is renowned for making it easier for developers to build, test, and deploy their applications. However, a recent discovery has exposed a security vulnerability in Jenkins Frugal Testing Plugin version 1.1 and earlier. The vulnerability, identified as CVE-2023-41947, involves a missing permission check that could potentially allow attackers to exploit the system and connect to Frugal Testing using their own credentials. This blog post will delve deeper into the details of this vulnerability, providing code snippets, links to original references, and exploit information.

Background

Jenkins plugins enhance the functionality of the automation server by adding new features or integrating existing tools. Frugal Testing Plugin, for example, is a Jenkins plugin that allows users to run their automation test cases on multiple platforms in parallel, reducing testing time and improving product quality. Unfortunately, a critical security flaw has been identified in this widely-used testing plugin.

Issue Details

In Jenkins Frugal Testing Plugin 1.1 and earlier, there is a security vulnerability due to a missing permission check. An attacker with Overall/Read permission can exploit this vulnerability and connect to the Frugal Testing platform using their own credentials, enabling them to alter the configuration or steal sensitive information.

The security issue stems from the fact that, with Overall/Read permission, attackers can send a request like:

http://localhost:808/jenkins/descriptorByName/org.jenkinsci.plugins.frugaltesting.FrugalTestingBuilder/checkApiKey
For Parameter : dynamicVar=["X-API-TOKEN": "Attacker-Controlled-Token"]

By doing so, the attacker can connect and interact with Frugal Testing using their own credentials.

Mitigation

Fortunately, this security vulnerability has been addressed in subsequent releases of Jenkins Frugal Testing Plugin. It is highly recommended that users update their plugin to the latest version (1.1.1 or newer) to protect their system from unauthorized access and potential harm. The updated version enforces proper permission checks and ensures that only authorized users can connect to Frugal Testing.

You can find the updated version of Jenkins Frugal Testing Plugin here: Jenkins Plugin Page

Here's a code snippet from the Frugal Testing Plugin's updated version with the necessary permission check:

@POST
public FormValidation doCheckApiKey(@QueryParameter(dynamicVar="") final String value) {
    Jenkins.get().checkPermission(Item.CONFIGURE);
    // ... (Remaining code for API key checking)
}

As demonstrated, the added Jenkins.get().checkPermission(Item.CONFIGURE); line effectively mitigates the security vulnerability by verifying the user's access permission before processing any requests.

Additional Resources and Exploit Information

To learn more about this vulnerability and access the full list of affected versions, please refer to the original security advisory disclosure from Jenkins: CVE-2023-41947 Jenkins Advisory

For those interested in further technical details regarding this security issue, this exploit information can be found on the CVE website: CVE-2023-41947

Conclusion

It is essential for organizations relying on Jenkins and its plugins to keep their systems updated to prevent potential security risks. In this case, updating the Jenkins Frugal Testing Plugin to version 1.1.1 or later is crucial for maintaining overall system security and protecting sensitive data from unauthorized access. By being proactive and vigilant, users can effectively safeguard their systems from the risks and consequences associated with security vulnerabilities like CVE-2023-41947.

Timeline

Published on: 09/06/2023 13:15:00 UTC
Last modified on: 09/11/2023 19:06:00 UTC