CVE-2020-2324: XXE vulnerability in Jenkins CVS Plugin
Summary
CVE-2020-2324: XXE vulnerability in Jenkins CVS Plugin. Affects org.jenkins-ci.plugins:cvs versions < 2.17. Fixed in 2.17. How to fix ↓
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Background
The Jenkins CVS Plugin is a Maven package that provides integration between Jenkins and CVS repositories. It allows users to manage and automate build processes using CVS as the version control system. The plugin enables Jenkins to interact with CVS repositories, perform checkouts, and retrieve changelogs.
The vulnerability identified as CVE-2020-2324 is an XML External Entity (XXE) vulnerability present in CVS Plugin versions 2.16 and earlier. These versions do not configure their XML parser to prevent XXE attacks. As a result, an attacker who can control an agent process can exploit this vulnerability to make Jenkins parse a specially crafted changelog file. This file can contain external entities that extract sensitive information from the Jenkins controller or enable server-side request forgery.
To address this issue, CVS Plugin version 2.17 has been released, which disables external entity resolution for its XML parser.
Vulnerability Detail
The XXE vulnerability in Jenkins CVS Plugin (CVE-2020-2324) arises from the lack of proper configuration of the XML parser in versions 2.16 and earlier. This vulnerability allows an attacker with control over an agent process to manipulate a changelog file and exploit external entities to extract sensitive information or perform server-side request forgery. The impact of this vulnerability can be severe, as it can lead to unauthorized access to sensitive data or enable further attacks on the Jenkins infrastructure.
How To Fix
Minimum fixed version
2.17
This is the first release that contains the fix.
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Workaround
As a temporary workaround, users can disable the Jenkins CVS Plugin if it is not essential for their build processes. Disabling the plugin will remove the vulnerability from the system. To disable the plugin, navigate to the 'Manage Plugins' section in Jenkins, select the 'Installed' tab, locate the CVS Plugin, and uncheck the checkbox next to it. After disabling the plugin, it is recommended to monitor for any updates or patches that address the vulnerability and re-enable the plugin once a fix is available.
Conclusion
The XXE vulnerability in Jenkins CVS Plugin (CVE-2020-2324) poses a significant risk to Jenkins installations using versions 2.16 and earlier. 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 2.17 or later, which disables external entity resolution. Alternatively, users can temporarily disable the plugin if it is not essential for their build processes. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The XXE vulnerability in Jenkins CVS Plugin can allow an attacker to extract sensitive information from the Jenkins controller or perform server-side request forgery. This can lead to unauthorized access to confidential data or enable further attacks on the Jenkins infrastructure.
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 CVS Plugin XXE vulnerability, using only the pom.xml file.
Yes, a temporary workaround is to disable the Jenkins CVS Plugin if it is not essential for your build processes. This will remove the vulnerability from the system. However, it is recommended to monitor for updates or patches and re-enable the plugin once a fix is available.
The CVSS score of the Jenkins CVS Plugin XXE vulnerability is 7.1, indicating a high severity level.
For more information about the Jenkins CVS Plugin XXE vulnerability (CVE-2020-2324), you can refer to the GitHub Security Advisory database (https://github.com/github/advisory-database) or contact the Jenkins community for assistance.
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