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Cross-site Scripting occurrences in Commerce Webservices 2.0
Due to a lack of proper input validation, SAP Commerce Webservices 2.0 (Swagger UI) - versions 1905, 2005, 2105, 2011, 2205, allows malicious inputs from untrusted sources, which can be leveraged by an attacker to execute a DOM Cross-Site Scripting (XSS) attack. As a result, an attacker may be able to steal user tokens and achieve a full account takeover including access to administrative tools in SAP Commerce. (2022-12-13, CVE-2022-41266)
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>