Exploitation Research Plan: CVE-2025-14846 (SocialChamp CSRF)

1. Vulnerability Summary

The SocialChamp with WordPress plugin (versions <= 1.3.5) is vulnerable to Cross-Site Request Forgery (CSRF). The vulnerability exists because the function wpsc_settings_tab_menu (likely responsible for both rendering the settings page and processing its form submissions) fails to perform nonce validation using check_admin_referer() or wp_verify_nonce(). This allows an attacker to modify the plugin's configuration (e.g., API keys, default posting settings) by tricking a logged-in administrator into visiting a malicious webpage.

2. Attack Vector Analysis

• Vulnerable Endpoint: /wp-admin/admin.php?page=social-champ-settings (The slug social-champ-settings is inferred from the plugin name and standard conventions).
• Vulnerable Function: wpsc_settings_tab_menu
• HTTP Method: POST
• Authentication Requirement: Authenticated Administrator (to bypass current_user_can checks, which are typically present even when nonces are missing).
• Payload Carry: The payload is carried in the POST body as standard form fields (e.g., wpsc_api_key, wpsc_api_secret).
• Preconditions: The plugin must be installed and active. The victim must be a logged-in administrator.

3. Code Flow

1. Registration: The plugin registers a settings page using add_menu_page or add_submenu_page, designating wpsc_settings_tab_menu as the callback function.
2. Entry Point: When the administrator visits the settings page or submits the settings form, WordPress executes wpsc_settings_tab_menu.
3. Sink (Processing): Inside wpsc_settings_tab_menu, the code likely contains a block similar to:

   if ( isset( $_POST['wpsc_save_settings'] ) ) { // Inferred parameter
       update_option( 'wpsc_api_key', sanitize_text_field( $_POST['wpsc_api_key'] ) );
       // ... other settings ...
   }
   

4. The Flaw: There is no call to check_admin_referer() or wp_verify_nonce() before the update_option calls. While it might check current_user_can( 'manage_options' ), this check is inherently satisfied when an admin's browser processes a CSRF request.

4. Nonce Acquisition Strategy

No nonce is required.
The essence of CVE-2025-14846 is the total absence of nonce validation in the wpsc_settings_tab_menu function. To exploit this:

1. The attacker does not need to obtain a nonce.
2. The attacker simply omits any nonce parameters or provides arbitrary values.
3. If the plugin's form happens to include a nonce field for show, the backend logic ignores it, allowing the forged request to proceed.

5. Exploitation Strategy

The goal is to overwrite the SocialChamp API settings with attacker-controlled values.

Step 1: Discover Parameters

Navigate to the settings page as an admin and identify the exact POST parameter names and the menu slug.

• Action: Use browser_navigate to wp-admin/admin.php?page=social-champ-settings (or the correct slug found via wp menu list).
• Action: Use browser_eval to extract input names:
  browser_eval("Array.from(document.querySelectorAll('input[name]')).map(i => i.name)")

Step 2: Forge the CSRF Request

Once parameters are identified (assuming wpsc_api_key and wpsc_save_settings for this plan), construct a POST request.

• Tool: http_request
• URL: http://localhost:8080/wp-admin/admin.php?page=social-champ-settings
• Method: POST
• Headers:
  • Content-Type: application/x-www-form-urlencoded
  • Cookie: [Admin Session Cookies]
• Body:
  wpsc_api_key=ATTACKER_API_KEY&wpsc_save_settings=1 (Exact keys must be verified in Step 1).

6. Test Data Setup

1. Plugin Installation: Ensure auto-post-to-social-media-wp-to-social-champ version 1.3.5 is installed.
2. Admin User: Have an active admin session available for the http_request tool.
3. Initial State: (Optional) Set a dummy value for the settings first:
   wp option update wpsc_api_key "original_legit_key"

7. Expected Results

• HTTP Response: A 302 Redirect back to the settings page or a 200 OK with a "Settings Saved" message in the HTML.
• Internal State: The WordPress database option wpsc_api_key (or equivalent) should now contain ATTACKER_API_KEY.

8. Verification Steps

After the http_request is sent, verify the change via WP-CLI:

1. Check Options:
   wp option get wpsc_api_key
2. Compare: Confirm the output matches ATTACKER_API_KEY.

9. Alternative Approaches

If the settings are not processed in wpsc_settings_tab_menu directly but via admin-post.php:

• Endpoint: wp-admin/admin-post.php
• Payload: Include action=wpsc_save_settings (or similar) in the POST body.
• Validation: Check for the absence of _wpnonce verification in the function hooked to admin_post_wpsc_save_settings.

If the parameters are JSON-encoded (unlikely for a standard settings page):

• Content-Type: application/json
• Body: {"wpsc_api_key": "ATTACKER_API_KEY"}