CVE-2019-10317: Jenkins SiteMonitor Plugin SSL/TLS Certificate Validation Bypass
Summary
CVE-2019-10317: Jenkins SiteMonitor Plugin globally and unconditionally disables SSL/TLS certificate validation. Affects org.jvnet.hudson.plugins:sitemonitor versions < 0.6. Fixed in 0.6. How to fix ↓
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Background
The Jenkins SiteMonitor Plugin is a Maven-based package that provides functionality for monitoring the availability and response time of websites. It is commonly used in Jenkins controllers to ensure the proper functioning of external sites. However, prior to version 0.6, the plugin had a vulnerability that globally and unconditionally disabled SSL/TLS certificate validation for the entire Jenkins controller JVM. This meant that any SSL/TLS errors were ignored, potentially exposing the controller to man-in-the-middle attacks or other security risks.
Vulnerability Detail
The vulnerability (CVE-2019-10317) in the Jenkins SiteMonitor Plugin allowed SSL/TLS certificate validation to be disabled without any checks or conditions. This meant that even if a website's SSL/TLS certificate was invalid or compromised, the plugin would still consider the site as valid and functioning properly. This vulnerability could be exploited by attackers to intercept or manipulate the communication between the Jenkins controller and external sites, leading to potential data breaches or unauthorized access. The severity of this vulnerability is rated as MODERATE with a CVSS score of 6.5.
How To Fix
Minimum fixed version
0.6
This is the first release that contains the fix.
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Workaround
If upgrading the Jenkins SiteMonitor Plugin is not immediately feasible, a temporary workaround can be implemented by manually validating SSL/TLS certificates for each site check. This can be achieved by modifying the plugin's source code to include certificate validation logic or by using a custom script that performs certificate validation before invoking the plugin's functionality. However, it is strongly recommended to upgrade to the latest version of the plugin as soon as possible to ensure long-term security.
Conclusion
The Jenkins SiteMonitor Plugin prior to version 0.6 had a vulnerability that disabled SSL/TLS certificate validation for the entire Jenkins controller JVM. This could lead to potential security risks and unauthorized access. To mitigate this vulnerability, it is crucial to upgrade the plugin to version 0.6 or later, which introduces an opt-in option for SSL/TLS error handling. Additionally, manual validation of SSL/TLS certificates can be used as a temporary workaround. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
This vulnerability allows SSL/TLS certificate validation to be bypassed, potentially exposing the Jenkins controller to man-in-the-middle attacks or unauthorized access to external sites.
You can use Vulert's playground (https://vulert.com/scanner) to check if your application is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities using just the pom.xml file, without requiring access to the code or installation.
Yes, upgrading the Jenkins SiteMonitor Plugin to version 0.6 or later fixes this vulnerability by introducing an opt-in option for SSL/TLS error handling.
Yes, you can manually validate SSL/TLS certificates for each site check by modifying the plugin's source code or using a custom script. However, upgrading to the latest version of the plugin is strongly recommended.
The severity of this vulnerability is rated as MODERATE with a CVSS score of 6.5.
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