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Cross-site Scripting occurrences in Adminlte
AdminLTE is a Pi-hole Dashboard for stats and configuration. In affected versions inserting code like `` in the field marked with "Domain to look for" and hitting enter (or clicking on any of the buttons) will execute the script. The user must be logged in to use this vulnerability. Usually only administrators have login access to pi-hole, minimizing the risks. Users are advised to upgrade. There are no known workarounds for this issue. (2022-07-07, CVE-2022-31029)
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>