Zabbix 5.0.0 Stored XSS via URL Widget Iframe

Risk: Low
Local: No
Remote: Yes

CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Exploit Title: Zabbix 5.0.0 - Stored XSS via URL Widget Iframe # Date: 8/11/2020 # Exploit Author: Shwetabh Vishnoi # Vendor Homepage: # Software Link: # 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): 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 “” 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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