CVE-2020-2206: Reflected XSS vulnerability in Jenkins VncRecorder Plugin
Summary
CVE-2020-2206: Reflected XSS vulnerability in Jenkins VncRecorder Plugin. Affects org.jenkins-ci.plugins:vncrecorder versions < 1.35. Fixed in 1.35. How to fix ↓
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Background
The Jenkins VncRecorder Plugin is a Maven package that provides functionality for recording VNC sessions in Jenkins. It allows users to capture and replay VNC sessions for debugging purposes. The plugin integrates with the Jenkins CI/CD platform, enabling users to easily record and analyze VNC sessions within their Jenkins pipelines. However, versions 1.25 and earlier of the VncRecorder Plugin are vulnerable to a reflected cross-site scripting (XSS) attack.
Vulnerability Detail
The VncRecorder Plugin versions 1.25 and earlier do not properly escape a parameter value in the checkVncServ form validation endpoint output. This allows an attacker to inject malicious scripts into the output, which will be executed when viewed by other users. The vulnerability can be exploited by tricking a user into visiting a specially crafted URL that contains the malicious script. As a result, the attacker can perform actions on behalf of the victim, potentially leading to unauthorized access, data theft, or other malicious activities. The vulnerability has a CVSS score of 6.1, indicating a moderate severity level.
How To Fix
Minimum fixed version
1.35
This is the first release that contains the fix.
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Workaround
If upgrading to version 1.35 is not immediately feasible, a temporary workaround is to disable or restrict access to the affected functionality. This can be achieved by removing or disabling the VncRecorder Plugin from the Jenkins installation. However, this workaround may impact the ability to record and analyze VNC sessions within Jenkins pipelines.
Conclusion
The Jenkins VncRecorder Plugin versions 1.25 and earlier are vulnerable to a reflected XSS attack. To mitigate this vulnerability, it is recommended to upgrade to version 1.35 or later. Alternatively, users can temporarily disable or restrict access to the affected functionality. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows an attacker to execute arbitrary scripts in the context of other users, potentially leading to unauthorized access, data theft, or other malicious activities.
You can use the Vulert 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.
While there is no specific known exploit for this vulnerability, it is important to address it promptly to prevent potential attacks.
A temporary workaround is to disable or restrict access to the affected functionality by removing or disabling the VncRecorder Plugin. However, this may impact the ability to record and analyze VNC sessions within Jenkins pipelines.
You can find more information about this vulnerability in the GitHub Advisory Database (https://github.com/github/advisory-database/advisories/GHSA-fq52-6cjf-jw59).
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