Serv-U FTP Server version 15.1.7 suffers from a persistent cross site scripting vulnerability leveraging the Email parameter.
514d8ebc96f062a481bd19ea5e4b5040# 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.