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FIBARO System Home Center v5.021 Remote File Include XSS

Medium

Advisory ID

ZSL-2020-5563

Release Date

22 March 2020

Vendor

FIBAR GROUP S.A. - https://www.fibaro.com

Affected Version

Home Center 3, Home Center 2, Home Center Lite, 5.021.38, 4.580, 4.570, 4.540, 4.530, 4.510, 4.180

CVE

CVE-2020-36905

Tested On

Apache/2.2.16 (Debian), nginx/1.9.5, nginx/1.8.0, lighttpd/1.4.41

Summary

Imagine that you live in a house where everything happens by itself. FIBARO Smart Home takes care of your everyday comfort and safety of all family members and in the meantime, saves energy on every single occasion. All this is possible thanks to Home Center 2 smart home HUB. Home Center 2 is an indispensable part of the FIBARO System without which the rest devices of home automation would be only beautiful objects. The smart home HUB collects and analyzes information about devices, communicates them with each other and thus directs the operation of the entire system and takes care of its security.

Description

The smart home solution is vulnerable to a remote Cross-Site Scripting triggered via a Remote File Inclusion issue by including arbitrary client-side dynamic scripts (JavaScript, VBScript) due to the undocumented proxy API and its url GET parameter. This allows hijacking the current session of the user or changing the look of the page by changing the HTML.

Proof of Concept

fibaro_rfixss.txtTXT

Disclosure Timeline

04.02.2020Vulnerability discovered.

15.02.2020Vendor contacted.

17.02.2020Vendor responds asking more details.

17.02.2020Sent details to the vendor.

20.02.2020Asked vendor for status update.

24.02.2020Vendor forwards the case to the technicians.

06.03.2020Asked vendor for status update.

21.03.2020No response from the vendor.

22.03.2020Public security advisory released.