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Cross-site Scripting occurrences in Enterprise Resource Planning Point Of Sale System

Special characters of ERP POS customer profile page are not filtered in users’ input, which allow remote authenticated attackers can inject malicious JavaScript and carry out stored XSS (Stored Cross-site scripting) attacks, additionally access and manipulate customer’s information. (2021-05-07, CVE-2021-30170)

Special characters of ERP POS news page are not filtered in users’ input, which allow remote authenticated attackers can inject malicious JavaScript and carry out stored XSS (Stored Cross-site scripting) attacks, additionally access and manipulate customer’s information. (2021-05-07, CVE-2021-30171)

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>

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