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Cross-site Scripting occurrences in Authentication Agent For Web
RSA Authentication Agent version 8.0.1 and earlier for Web for both IIS and Apache Web Server are affected by a cross-site scripting vulnerability. The attackers could potentially exploit this vulnerability to execute arbitrary HTML or JavaScript code in the user's browser session in the context of the affected website. (2018-03-30, CVE-2018-1233)
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>