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Cross-site Scripting occurrences in Espace Desktop
There is a stored cross-site scripting (XSS) vulnerability in Huawei eSpace Desktop V300R001C00 and V300R001C50 version. Due to the insufficient validation of the input, an authenticated, remote attacker could exploit this vulnerability to send abnormal messages to the system and perform a XSS attack. A successful exploit could cause the eSpace Desktop to hang up, and the function will restore to normal after restarting the eSpace Desktop. (2018-06-01, CVE-2018-7976)
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>