CVE-2020-2249: Credentials stored in plain text by Jenkins tfs Plugin
Summary
CVE-2020-2249: Credentials stored in plain text by Jenkins tfs Plugin. Affects org.jenkins-ci.plugins:tfs versions < 5.157.1. No fix is published. How to fix ↓
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Background
The Jenkins tfs Plugin is a Maven package (org.jenkins-ci.plugins:tfs) that provides integration between Jenkins and Microsoft Team Foundation Server (TFS). It allows Jenkins to interact with TFS repositories, build definitions, and work items. The plugin is widely used in software development pipelines to automate build and deployment processes. However, versions 5.157.1 and earlier of the plugin suffer from a vulnerability that stores a webhook secret in plain text in the global configuration file hudson.plugins.tfs.TeamPluginGlobalConfig.xml on the Jenkins controller. This secret can be accessed by attackers with file system access to the Jenkins controller.
Vulnerability Detail
The vulnerability in the Jenkins tfs Plugin arises from the insecure storage of a webhook secret in plain text. This secret is stored in the global configuration file, which can be accessed by attackers with file system access to the Jenkins controller. By obtaining the secret, an attacker can potentially impersonate the TFS server and perform unauthorized actions within the Jenkins environment. This could lead to unauthorized code execution, data leakage, or disruption of the build and deployment processes. The vulnerability has a CVSS score of 3.3, indicating a low severity.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround provided for this vulnerability. The recommended solution is to upgrade the Jenkins tfs Plugin to a secure version.
Conclusion
The Jenkins tfs Plugin vulnerability (CVE-2020-2249) exposes the webhook secret in plain text, allowing attackers with file system access to potentially impersonate the TFS server and perform unauthorized actions within the Jenkins environment. To mitigate this risk, it is crucial to upgrade the plugin to a secure version (5.157.2 or later). Additionally, following security best practices for Jenkins can further enhance the overall security posture of the environment. For more information and support on vulnerability remediation, contact DevNack.com.
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FAQ
The vulnerability allows attackers with file system access to the Jenkins controller to obtain the webhook secret stored in plain text. With this secret, an attacker can potentially impersonate the TFS server and perform unauthorized actions within the Jenkins environment.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your Jenkins environment is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities, using just the pom.xml file.
There is no known exploit publicly available for this vulnerability at the time of this report. However, it is important to apply the recommended fix to mitigate the risk of unauthorized access.
In addition to upgrading the Jenkins tfs Plugin, it is recommended to follow security best practices for Jenkins, such as restricting file system access to authorized personnel, regularly monitoring and auditing the Jenkins controller, and implementing strong access controls.
For further support on vulnerability remediation, you can reach out to info@devnack.com. They can provide guidance and assistance in addressing this vulnerability.
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