Badminton Center Management System Cross-site Scripting

Badminton Center Management System 1.0 is vulnerable to Cross Site Scripting (XSS) via /bcms/classes/Master.php?f=save_court_rental. (2022-05-24, CVE-2022-30456)

A vulnerability, which was classified as problematic, was found in Badminton Center Management System. This affects the userlist module at /bcms/admin/?page=user/list. The manipulation of the argument username with the input 1 leads to an authenticated cross site scripting. Exploit details have been disclosed to the public. (2022-05-23, CVE-2022-1817)

Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.

The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:

https://server.com/confirmation?message=Transaction+Complete

what results in:

<span>Confirmation: Transaction Complete</span>

In that case the message can be modified to become a valid Javascript code, e.g.:

https://server.com/confirmation?message=<script>dangerous javascript code here</script>

and it will be executed locally by the user's browser with full access to the user's personal application/browser data:

<span>Confirmation: <script>dangerous javascript code here</script></span>