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Cross-site Scripting occurrences in Spectrum Power 3
A vulnerability has been identified in Spectrum Power 3 (Corporate User Interface) (All versions <= v3.11), Spectrum Power 4 (Corporate User Interface) (Version v4.75), Spectrum Power 5 (Corporate User Interface) (All versions < v5.50), Spectrum Power 7 (Corporate User Interface) (All versions <= v2.20). The web server could allow Cross-Site Scripting (XSS) attacks if unsuspecting users are tricked into accessing a malicious link. User interaction is required for a successful exploitation. The user does not need to be logged into the web interface in order for the exploitation to succeed.At the stage of publishing this security advisory no public exploitation is known. (2019-07-11, CVE-2019-10933)
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>