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Cross-site Scripting occurrences in Call Recording
ZOOM International Call Recording 6.3.1 suffers from multiple authenticated stored XSS vulnerabilities via the phoneNumber field in the (1) User Edit or (2) User Add form, (3) name field in the Role Add form, (4) name or number field in the Edit Group form, (5) tagKey or tagValue field in the Recording Rules Configuration, or (6) txt_69735:/VemailAddress/value or txt_75767:/VemailFrom/value field in callrec/config. (2020-04-27, CVE-2019-18223)
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>