Authentication Bypass in SimpleUI via AjaxAdmin

Executive Summary

This vulnerability affects the SimpleUI library's AjaxAdmin class, which registers custom AJAX endpoints without enforcing Django admin authentication. Attackers can send POST requests to these endpoints with action names and selected items, executing admin actions without proper authorization. The issue occurs because the endpoints do not verify authentication, staff status, or action permissions before executing actions.

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Detection Guidance

Check for unauthorized POST requests to /ajax or /layer endpoints in your Django admin interface. Monitor logs for requests to these paths with action parameters. Use tools like curl to test if actions can be executed without authentication: curl -X POST http://<target>/ajax -d 'action=<action_name>&selected=1'

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Impact Analysis

An attacker could exploit this to perform unauthorized actions such as data export, modification, or destructive bulk operations if the application has registered such actions. This could lead to data breaches, unauthorized changes, or system disruptions.

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Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection requirements and HIPAA's security rules for protected health information. Non-compliance may result in legal penalties, fines, or reputational damage.

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Mitigation Strategies

Apply the suggested fix by wrapping custom views with Django admin's admin_view decorator in get_urls(). Ensure action authorization by checking self.get_actions(request) before execution. Reject unsafe HTTP methods and preserve Django admin's CSRF protection.

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