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Cross-site Scripting occurrences in 2fa Enterprise Server
A stored and reflected cross-site scripting (XSS) vulnerability in WiKID 2FA Enterprise Server through 4.2.0-b2047 allow remote attackers to inject arbitrary web script or HTML via /WiKIDAdmin/adm_usrs.jsp. The usr parameter is vulnerable: the reflected cross-site scripting occurs immediately after the user is created. The malicious script is stored and will be executed whenever /WiKIDAdmin/adm_usrs.jsp is visited. (2019-10-17, CVE-2019-17120)
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>