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Cross-site Scripting occurrences in Attendance Management System
Attendance Management System 1.0 is affected by a Cross Site Scripting (XSS) vulnerability. The value of the FirstRecord request parameter is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The attacker can access the system, by using the XSS-reflected method, and then can store information by injecting the admin account on this system. (2021-12-26, CVE-2021-44598)
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>