Unauthorized Shipping Method Modification in Colissimo Officiel WooCommerce Plugin

Executive Summary

The vulnerability exists in the Colissimo Officiel : Méthodes de livraison pour WooCommerce plugin for WordPress, specifically in versions up to and including 2.9.0. It is caused by a missing capability check in the updateShippingMethod() function, which is triggered by the wp_ajax_lpc_order_affect AJAX action.

Because the function does not verify the user's capabilities or perform nonce verification, an authenticated attacker with Subscriber-level access or higher can supply an order ID and modify the shipping method, pickup-point metadata, and shipping address of arbitrary WooCommerce orders, including those placed by other users.

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Impact Analysis

This vulnerability allows attackers with low-level authenticated access to modify shipment information on WooCommerce orders that they do not own. This can lead to unauthorized changes in shipping methods, pickup locations, and shipping addresses.

Such unauthorized modifications could result in orders being redirected, lost, or intercepted, potentially causing financial loss, customer dissatisfaction, and operational disruptions.

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Detection Guidance

This vulnerability involves unauthorized modification of WooCommerce order shipment data via the wp_ajax_lpc_order_affect AJAX action without proper capability or nonce checks.

To detect exploitation attempts on your system or network, you can monitor HTTP requests targeting the wp-admin/admin-ajax.php endpoint with the action parameter set to lpc_order_affect.

Example commands to detect suspicious activity include:

• Using grep on web server logs to find requests: grep 'action=lpc_order_affect' /var/log/apache2/access.log
• Using tcpdump or Wireshark to capture HTTP POST requests containing 'action=lpc_order_affect'.
• Checking for unexpected changes in WooCommerce order shipping data in the database, especially from users with Subscriber-level access.

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Mitigation Strategies

Immediate mitigation steps include:

• Update the Colissimo Officiel WooCommerce plugin to a version later than 2.9.0 where this vulnerability is fixed.
• If an update is not immediately possible, restrict access to the wp-admin/admin-ajax.php endpoint or specifically block requests with the action=lpc_order_affect parameter from users without proper privileges.
• Implement additional web application firewall (WAF) rules to detect and block unauthorized AJAX requests attempting to modify order shipment data.
• Review user roles and permissions to ensure that Subscriber-level users do not have unnecessary access.

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Compliance Impact

The vulnerability allows authenticated attackers with Subscriber-level access and above to modify shipment information of arbitrary WooCommerce orders, including those placed by other users.

This unauthorized modification of order data could potentially lead to violations of data integrity and confidentiality requirements found in standards like GDPR and HIPAA, as personal shipping information can be altered without proper authorization.

However, the provided information does not explicitly describe the direct impact on compliance with these regulations.

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