Mc Works64 Cross-site Scripting

Cross-site Scripting vulnerability in Mitsubishi Electric MC Works64 versions 4.04E (10.95.210.01) and prior and ICONICS MobileHMI versions 10.96.2 and prior allows a remote unauthenticated attacker to gain authentication information of an MC Works64 or MobileHMI and perform any operation using the acquired authentication information, by injecting a malicious script in the URL of a monitoring screen delivered from the MC Works64 server or MobileHMI server to an application for mobile devices and leading a legitimate user to access this URL. (2022-01-21, CVE-2022-23127)

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>