CVE-2021-21680: XXE vulnerability in Jenkins Nested View Plugin
Summary
CVE-2021-21680: XXE vulnerability in Jenkins Nested View Plugin. Affects org.jenkins-ci.plugins:nested-view versions < 1.21. Fixed in 1.21. How to fix ↓
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Background
The Jenkins Nested View Plugin is a Maven package that provides functionality for creating nested views in Jenkins. It allows users to organize their Jenkins views in a hierarchical structure, making it easier to manage and navigate through large numbers of views. The plugin is widely used in Jenkins installations and is an integral part of many Jenkins workflows.
Vulnerability Detail
The Nested View Plugin version 1.20 and earlier is vulnerable to an XML External Entity (XXE) attack. This vulnerability arises from the plugin's failure to configure its XML transformer to prevent XXE attacks. As a result, an attacker with the ability to configure views in Jenkins can exploit this vulnerability by crafting a malicious view XML definition that includes external entities. By doing so, the attacker can extract sensitive information from the Jenkins controller or perform server-side request forgery. The vulnerability has been assigned a CVSS score of 7.1, indicating a high severity level.
How To Fix
Minimum fixed version
1.21
This is the first release that contains the fix.
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Workaround
There is no known workaround for this vulnerability. It is essential to update the Nested View Plugin to the latest version to ensure the security of the Jenkins installation.
Conclusion
The XXE vulnerability in the Jenkins Nested View Plugin poses a significant security risk to Jenkins installations. It allows attackers to extract sensitive information or perform server-side request forgery. To mitigate this vulnerability, it is crucial to update the plugin to version 1.21 or later. Additionally, it is recommended to regularly monitor for vulnerabilities using tools like Vulert to ensure the ongoing security of your Jenkins environment.
See every vulnerability recorded for org.jenkins-ci.plugins:nested-view →
FAQ
An XML External Entity (XXE) vulnerability is a type of attack that exploits the ability of XML parsers to process external entities. By including malicious external entities in XML input, an attacker can manipulate the parsing process to disclose sensitive information or perform other malicious actions.
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, including the Jenkins Nested View Plugin. Simply provide your pom.xml file to the Vulert Playground, and it will analyze your dependencies and notify you if any vulnerabilities are detected.
While there is no specific known exploit for this vulnerability, it is crucial to address it promptly to prevent potential attacks. By upgrading to the latest version of the Nested View Plugin, you can mitigate the risk of exploitation.
There have been no reported incidents related to this vulnerability at the time of this advisory. However, it is essential to stay proactive and update the plugin to ensure the security of your Jenkins installation.
For further support on vulnerability remediation or any other security concerns, you can reach out to info@devnack.com. Our team of experts is available to assist you in securing your Jenkins installation.
Related vulnerabilities
Recent vulnerabilities recorded for org.jenkins-ci.plugins:nested-view.
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