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Cross-site Scripting occurrences in Ipswitch Ws Ftp Server

In Progress WS_FTP Server prior to version 8.7.3, multiple reflected cross-site scripting (XSS) vulnerabilities exist in the administrative web interface. It is possible for a remote attacker to inject arbitrary JavaScript into a WS_FTP administrator's web session. This would allow the attacker to execute code within the context of the victim's browser. (2022-08-02, CVE-2022-36967)

Why Cross-site Scripting can be dangerous

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>

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