Ecostruxure Power Monitoring Expert Cross-site Scripting

A CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability exists that could allow an authenticated attacker to view data, change settings, or impact availability of the software when the user visits a page containing the injected payload. Affected Product: EcoStruxure Power Monitoring Expert (Versions 2020 and prior) (2022-02-04, CVE-2022-22804)

A CWE-79: Improper Neutralization of Input During Web Page Generation vulnerability exists in EcoStruxureª and SmartStruxureª Power Monitoring and SCADA Software (see security notification for version information) that could allow an attacker to perform actions on behalf of the authorized user when accessing an affected webpage. (2020-12-01, CVE-2020-7546)

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>