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Cross-site Scripting occurrences in Emc Elastic Cloud Storage
Dell EMC ECS versions prior to 3.4.0.1 contain an XSS vulnerability. A remote authenticated malicious user could exploit this vulnerability to store malicious HTML or JavaScript code in a trusted application data store. When victim users access the data store through their browsers, the malicious code gets executed by the web browser in the context of the vulnerable web application. (2020-02-06, CVE-2020-5317)
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>