CVE-2021-21700: Stored XSS vulnerability in Jenkins Scriptler Plugin
Summary
CVE-2021-21700: Stored XSS vulnerability in Jenkins Scriptler Plugin. Affects org.jenkins-ci.plugins:scriptler versions < 3.4. Fixed in 3.4. How to fix ↓
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Background
The Jenkins Scriptler Plugin is a tool that allows users to define and manage scripts within the Jenkins automation server. It provides a user interface for creating, editing, and executing scripts that can be used for various tasks in the Jenkins environment. The plugin is widely used by developers and administrators to automate workflows and customize Jenkins functionality.
Vulnerability Detail
The Scriptler Plugin version 3.3 and earlier are affected by a stored cross-site scripting (XSS) vulnerability. This vulnerability arises from the plugin's failure to properly escape the name of scripts on the user interface when confirming their deletion. As a result, an attacker with the ability to create Scriptler scripts can exploit this vulnerability to inject malicious code into the Jenkins environment. This can lead to unauthorized access, data theft, and potential compromise of the entire Jenkins server.
How To Fix
Minimum fixed version
3.4
This is the first release that contains the fix.
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Workaround
If immediate upgrade to version 3.4 is not possible, users can mitigate the risk by implementing the following workaround:
- Disable the ability for users to create or modify Scriptler scripts.
- Regularly review and delete any existing Scriptler scripts that are not necessary.
By limiting the creation and modification of scripts and removing unnecessary scripts, the attack surface for this vulnerability can be reduced.
Conclusion
The Jenkins Scriptler Plugin version 3.3 and earlier are affected by a stored XSS vulnerability that can be exploited by attackers with the ability to create Scriptler scripts. Upgrading to version 3.4 or later is recommended to mitigate this vulnerability. In the meantime, users can implement the provided workaround to reduce the risk. For further support and assistance in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for org.jenkins-ci.plugins:scriptler →
FAQ
The vulnerability allows an attacker to execute arbitrary code within the Jenkins environment, potentially leading to unauthorized access, data theft, and compromise of the entire Jenkins server.
Users of Jenkins Scriptler Plugin versions 3.3 and earlier are affected by this vulnerability. It is recommended for all users of the plugin to upgrade to version 3.4 or later.
There are no known public exploits for this vulnerability at the time of this report. However, it is important to promptly apply the recommended fix to mitigate the risk.
No, this vulnerability requires an attacker to have the ability to create Scriptler scripts within the Jenkins environment. It cannot be exploited remotely without prior access.
There is no evidence of active exploitation of this vulnerability at the time of this report. However, it is crucial to apply the recommended fix to prevent potential future attacks.
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