Prtg Network Monitor Cross-site Scripting

PRTG Network Monitor before 21.3.69.1333 allows stored XSS via an unsanitized string imported from a User Object in a connected Active Directory instance. (2021-09-13, CVE-2021-29643)

XSS exists in PRTG Network Monitor 20.1.56.1574 via crafted map properties. An attacker with Read/Write privileges can create a map, and then use the Map Designer Properties screen to insert JavaScript code. This can be exploited against any user with View Maps or Edit Maps access. (2020-06-23, CVE-2020-14073)

PRTG Network Monitor v7.1.3.3378 allows XSS via the /public/login.htm errormsg or loginurl parameter. NOTE: This product is discontinued. (2019-12-31, CVE-2019-9206)

PRTG Network Monitor v7.1.3.3378 allows XSS via the /search.htm searchtext parameter. NOTE: This product is discontinued. (2019-12-31, CVE-2019-9207)

PRTG before 19.1.49.1966 has Cross Site Scripting (XSS) in the WEBGUI. (2019-04-10, CVE-2018-14683)

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>