CVE-2020-2307: Exposure of Sensitive Information in Jenkins Kubernetes Plugin
Summary
CVE-2020-2307: Exposure of Sensitive Information to an Unauthorized Actor in Jenkins Kubernetes Plugin. Affects org.csanchez.jenkins.plugins:kubernetes across 4 version ranges.
< 1.21.6
>= 1.22.0, < 1.25.4.1
>= 1.26.0, < 1.26.5
>= 1.27.0, < 1.27.4
Fixed in 4 releases; the minimum fixed version depends on the release line you run. How to fix ↓
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Background
The Jenkins Kubernetes Plugin is a Maven package (org.csanchez.jenkins.plugins:kubernetes) that provides integration between Jenkins and Kubernetes, allowing users to dynamically create Jenkins agents in Kubernetes pods. This plugin offers features such as pod templates and container templates, which allow users to define the environment for running Jenkins jobs. However, versions prior to 1.27.4, 1.26.5, 1.25.4.1, and 1.21.6 of the plugin contain a vulnerability that exposes sensitive information to unauthorized actors.
Vulnerability Detail
The vulnerability in the Jenkins Kubernetes Plugin allows low-privilege users to access potentially sensitive environment variables of the Jenkins controller. This is achieved through a feature that replaces placeholders in pod template and container template fields with environment variable values. By exploiting this feature, an unauthorized actor can gain access to sensitive information stored in the Jenkins controller's environment variables. The impact of this vulnerability can vary depending on the sensitivity of the exposed information and the privileges of the affected Jenkins controller.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
< 1.21.61.21.6 -
>= 1.22.0, < 1.25.4.11.25.4.1 -
>= 1.26.0, < 1.26.51.26.5 -
>= 1.27.0, < 1.27.41.27.4
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability. However, users can mitigate the risk by ensuring that low-privilege users do not have access to the Jenkins controller's environment variables.
Conclusion
The Jenkins Kubernetes Plugin prior to versions 1.27.4, 1.26.5, 1.25.4.1, and 1.21.6 is vulnerable to exposure of sensitive information. This vulnerability allows low-privilege users to access potentially sensitive environment variables of the Jenkins controller. It is recommended to update the plugin to the patched version to mitigate the risk. For further support, you can contact DevNack.com.
See every vulnerability recorded for org.csanchez.jenkins.plugins:kubernetes →
FAQ
The impact of this vulnerability depends on the sensitivity of the exposed information and the privileges of the affected Jenkins controller. It could potentially lead to unauthorized access to sensitive data.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your Jenkins installation is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities, using just the pom.xml file.
There are no known exploits for this vulnerability at the time of this advisory. However, it is recommended to patch the plugin as soon as possible to mitigate the risk.
No, the recommended fix for this vulnerability is to update the Jenkins Kubernetes Plugin to the patched version.
For further support on vulnerability remediation, you can reach out to info@devnack.com.
References
Related vulnerabilities
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