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Cross-site Scripting occurrences in Falling-fruit
A vulnerability has been found in falling-fruit and classified as problematic. This vulnerability affects unknown code. The manipulation leads to cross site scripting. The attack can be initiated remotely. The name of the patch is 15adb8e1ea1f1c3e3d152fc266071f621ef0c621. It is recommended to apply a patch to fix this issue. VDB-215446 is the identifier assigned to this vulnerability. (2022-12-13, CVE-2022-4456)
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>