Executive Summary

This vulnerability exists in the WooCommerce Filter Plus plugin for WordPress (versions up to and including 1.1.5). It is caused by a missing capability check on certain AJAX actions ('filter_save_settings' and 'add_filter_options'), which allows unauthenticated attackers to modify the plugin's settings and create arbitrary filter options without proper authorization.

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Impact Analysis

An attacker can exploit this vulnerability to change the plugin's settings and add arbitrary filter options without authentication. This unauthorized modification could lead to unexpected behavior on the website, potentially affecting the user experience or the integrity of product filtering, but it does not directly impact confidentiality or availability.

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Mitigation Strategies

To mitigate this vulnerability, immediately update the WooCommerce – Filter Plus plugin to a version later than 1.1.5 where the missing capability checks on 'filter_save_settings' and 'add_filter_options' AJAX actions are fixed. If an update is not available, restrict access to these AJAX actions by implementing proper capability checks or disabling the plugin until a patch is released.

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Compliance Impact

The provided information does not specify how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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Detection Guidance

This vulnerability can be detected by monitoring for unauthorized or unauthenticated AJAX requests to the WordPress site targeting the endpoints related to the Filter Plus plugin's AJAX actions: 'filter_save_settings' and 'add_filter_options'. Specifically, look for HTTP POST requests to admin-ajax.php with the action parameter set to either 'filter_save_settings' or 'add_filter_options' coming from unauthenticated users. Example commands to detect such attempts include using curl to test the endpoints or using network monitoring tools to filter such requests. Example curl commands to test the vulnerability (replace example.com with your domain): 1. Check 'filter_save_settings' action: curl -X POST https://example.com/wp-admin/admin-ajax.php -d "action=filter_save_settings" 2. Check 'add_filter_options' action: curl -X POST https://example.com/wp-admin/admin-ajax.php -d "action=add_filter_options" Additionally, you can use tools like tcpdump or Wireshark to filter HTTP POST requests to admin-ajax.php with these action parameters. Monitoring web server logs for POST requests to admin-ajax.php with these actions from unauthenticated IPs can also help detect exploitation attempts. [3]

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