Serv-U FTP Server 15.1.7 Cross Site Scripting

`# Exploit Title: Stored Cross-Site Scripting  
# Date: 16/12/2019  
# Exploit Author: Cyb0r9  
# Vendor Homepage: https://www.serv-u.com/ <https://www.serv-u.com/>  
# Software Link: https://www.serv-u.com/downloads <https://www.serv-u.com/downloads>  
# Version: SOLARWIND Serv-U FTP Server v15.1.7  
# Tested on: Windows 10 x64  
# CVE : CVE-2019-19829  
  
# Overview  
  
The application is vulnerable to a XSS stored vulnerability.  
  
Vulnerable parameter : Email   
  
lacked input validation allowing Javascript code to be inserted and executed  
in the context the user's browser session either when the victim logs to the  
web client or browses to the Serv-U server login page.  
  
A privilege user could manipulate the affected parameter on an existing  
user's account so that Javascript is executed on the client's browser when  
the victim logs into his account.  
  
For example, a successful XSS attack could result in the attacker  
redirecting the user to a phishing/malicious site or performing actions as  
the victim on the Serv-U application.  
  
** Injection Point in user properties **  
  
* Email  
  
# Proof of concept  
  
1) Login as a user that has privileges to create or modify users.  
  
2) Create a new user and add the following payload into the "Email" parameter.  
  
Payload used : "'/><script>alert(7);</script>@gmail.com"'/></script><script>;alert(7);</script>  
  
3) Login as the victim user and observe popup alert.  
`