Executive Summary

This vulnerability is a cross-site request forgery (CSRF) issue found in the Jenkins Priority Sorter Plugin version 936.v2c01c6b_84449 and earlier. It allows attackers to overwrite the global job priority configuration in Jenkins.

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Impact Analysis

An attacker exploiting this vulnerability can change the global job priority settings in Jenkins without authorization. This could disrupt the normal job scheduling and execution priorities, potentially causing delays or resource misallocation in your Jenkins environment.

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Detection Guidance

This vulnerability affects Jenkins Priority Sorter Plugin version 936.v2c01c6b_84449 and earlier. To detect if your system is vulnerable, you should check the installed version of the Priority Sorter Plugin in your Jenkins instance.

• Access your Jenkins server and navigate to Manage Jenkins > Manage Plugins > Installed tab.
• Look for the Priority Sorter Plugin and verify its version number.
• Alternatively, you can use Jenkins CLI or API to query the installed plugins and their versions.
• Example CLI command to list plugins and versions: java -jar jenkins-cli.jar -s http://your-jenkins-server/ list-plugins
• Check for any unusual changes or overwrites in the global job priority configuration, which could indicate exploitation.

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Mitigation Strategies

To mitigate this vulnerability, you should immediately update the Jenkins Priority Sorter Plugin to a version later than 936.v2c01c6b_84449 where the issue is fixed.

• Go to Manage Jenkins > Manage Plugins > Updates tab and update the Priority Sorter Plugin.
• If an update is not immediately available, restrict access to Jenkins to trusted users only to prevent CSRF attacks.
• Enable CSRF protection in Jenkins if it is not already enabled.
• Review and monitor global job priority configurations for unauthorized changes.

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