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Cross-site Scripting occurrences in Dsknet
An issue was discovered in DSK DSKNet 2.16.136.0 and 2.17.136.5. The new menu option within the general Parameters page is vulnerable to stored XSS. The attacker can create a menu option, make it visible to every application user, and conduct session hijacking, account takeover, or malicious code delivery, with the final goal of achieving client-side code execution. (2022-07-18, CVE-2022-24692)
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>