Sinvr 3 Video Server Cross-site Scripting

A vulnerability has been identified in Control Center Server (CCS) (All versions < V1.5.0). The web interface of the Control Center Server (CCS) contains a reflected Cross-site Scripting (XSS) vulnerability that could allow an unauthenticated remote attacker to steal sensitive data or execute administrative actions on behalf of a legitimate administrator of the CCS web interface. (2020-03-10, CVE-2019-19293)

A vulnerability has been identified in Control Center Server (CCS) (All versions < V1.5.0). The web interface of the Control Center Server (CCS) contains multiple stored Cross-site Scripting (XSS) vulnerabilities in several input fields. This could allow an authenticated remote attacker to inject malicious JavaScript code into the CCS web application that is later executed in the browser context of any other user who views the relevant CCS web content. (2020-03-10, CVE-2019-19294)

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>