Zabbix 5.0.0 Cross Site Scripting

`# Exploit Title: Zabbix 5.0.0 - Stored XSS via URL Widget Iframe  
# Date: 8/11/2020  
# Exploit Author: Shwetabh Vishnoi  
# Vendor Homepage: https://www.zabbix.com/  
# Software Link: https://www.zabbix.com/download  
# Affected Version: Zabbix before 3.0.32rc1, 4.x before 4.0.22rc1, 4.1.x through 4.4.x before 4.4.10rc1, and 5.x before 5.0.2rc1  
# CVE : CVE-2020-15803  
  
Affected URL/endpoint(s):  
http://192.168.1.7/zabbix.php?sid=f7ca8c8270ce38c7&action=dashboard.widget.check  
  
Affected Param: <iframe src="http://localhost/hello.html" scrolling="auto"  
id="iframe" class="widget-url" width="100%" height="100%"></iframe>  
  
Description: The application contains a widget functionality within Global  
View Dashboard which can be used by a malicious admin to propagate stored  
cross site scripting attack. The “URL” widget iframe does not have any  
inbuilt restrictions for the content executing within.  
  
Impact: The malicious webpages within iframes can be used for hosting forms  
for Phishing, malware propagation, forced redirections etc.  
  
The affected Global View dashboard is displayed to all the users of the  
application, so all the users will be affected with this vulnerability.  
  
Reproduction Steps:  
1. Login to the application with Admin  
2. In Global View Dashboard, Add a widget  
3. Select Type – “URL”, fill any random values for Name, Refresh Interval.  
4. Now, in the URL parameter, enter a malicious URL.  
5. For demo purpose, I have hosted a web server on my machine and hosted a webpage http://localhost/hello.html. (Alternatively, you can use “ http://14.rs” to display popups.)  
6. The malicious webpage containing payload will be executed on the dashboard via iFrame.  
7. The executed content can redirect the user to a malicious page (We have used Bing page for redirection).  
  
`