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Zabbix 5.0.0 Stored XSS via URL Widget Iframe

CVE Category Price Severity
CVE-2020-15803 CWE-79 $5,000 High
Author Risk Exploitation Type Date
Expliot High Remote 2020-12-04
CVSS EPSS EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L 0.0212 0.95

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020120027

Below is a copy:

Zabbix 5.0.0 Stored XSS via URL Widget Iframe
# 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).

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