SugarCRM Enterprise 9.0.0 - Cross-Site Scripting

# Exploit Title: 0Day UnauthenticatedXSS SugarCRM Enterprise
# Google Dork: N/A
# Date: 11.08.2019
# Exploit Author: Ilca Lucian Florin
# Vendor Homepage: https://www.sugarcrm.com
# Version: 9.0.0
# Tested on: Windows 7 / Internet Explorer 11 / Google Chrome 76
# CVE : 2019-14974

The application fails to sanitize user input on https://sugarcrm-qms.XXX.com/mobile/error-not-supported-platform.html and reflect the input directly in the HTTP response, allowing the hacker to exploit the vulnerable parameter and have malicious content executed in the victim's browser.

Steps to reproduce:

1.Attacker will craft a malicious payload and create a legitimate link with the payload included;
2. Attacker will send the link to the victim;
3. Upon clicking on the link, the malicious payload will be reflected in the response and executed in the victim’s browser.

The behavior can be observed by visiting the following URL:

https://server/mobile/error-not-supported-platform.html?desktop_url=javascript:alert(document.cookie);//itms://

Clicking on FULL VERSION OF WEBSITE will trigger the XSS.

Impact statement:

Although requiring user interaction, reflected XSS impact might range from web defacement to stealing user info and full account takeover, depending on the circumstances.

Recommendation:

Always ensure to validate parameters input and encode the output.