CVE-2020-2228: Improper authorization in Jenkins GitLab Authentication Plugin
Summary
CVE-2020-2228: GitLab Authentication Plugin 1.5 and earlier does not differentiate between user names and hierarchical group names when performing authorization. Affects org.jenkins-ci.plugins:gitlab-oauth versions < 1.6. Fixed in 1.6. How to fix ↓
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Background
The Jenkins GitLab Authentication Plugin is a plugin for the Jenkins automation server that allows users to authenticate using their GitLab credentials. It integrates Jenkins with GitLab, enabling users to log in to Jenkins using their GitLab accounts. The plugin provides a seamless authentication experience and simplifies user management for organizations using both Jenkins and GitLab. However, versions 1.5 and earlier of the plugin suffer from an improper authorization vulnerability.
Vulnerability Detail
The vulnerability in the Jenkins GitLab Authentication Plugin arises from a failure to differentiate between user names and hierarchical group names during authorization. This means that an attacker with permissions to create groups in GitLab can exploit this flaw to gain the privileges granted to another user or group. By creating a group with the same base name as a user, the attacker can trick the plugin into granting them the same privileges as that user or group. This can lead to unauthorized access, privilege escalation, and potential data breaches.
How To Fix
Minimum fixed version
1.6
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 apply the recommended fix by upgrading to the latest version of the GitLab Authentication Plugin.
Conclusion
The Jenkins GitLab Authentication Plugin versions 1.5 and earlier suffer from an improper authorization vulnerability that allows an attacker to gain unauthorized access and potentially escalate privileges. To mitigate this vulnerability, it is crucial to upgrade to version 1.6 or later of the plugin. There are no known workarounds, and it is recommended to apply the fix promptly to ensure the security of your Jenkins installation. For further support and assistance, please contact DevNack.com.
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FAQ
This vulnerability allows an attacker with permissions to create groups in GitLab to gain unauthorized access and potentially escalate their privileges. It can lead to unauthorized actions, data breaches, and compromise the integrity of the Jenkins automation server.
You can use the Vulert Playground at Vulert Scanner to check if your Jenkins installation is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities, using just the pom.xml file to assess the presence of vulnerabilities.
There are no known public exploits for this vulnerability at the time of this report. However, it is crucial to apply the recommended fix promptly to mitigate the risk of exploitation.
No, there is no known workaround for this vulnerability. Upgrading to the latest version of the GitLab Authentication Plugin is the recommended solution.
For further support and assistance with vulnerability remediation, you can contact info@devnack.com. Our team of experts will be happy to assist you.
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