Date: Thu, 1 Aug 2013 23:48:27 +0000
From: Trustwave Advisories <TrustwaveAdvisories@...stwave.com>
To: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>
Subject: TWSL2013-020: Hard-Coded Bluetooth PIN
 Vulnerability in LIXIL Satis Toilet

Trustwave SpiderLabs Security Advisory TWSL2013-020:
Hard-Coded Bluetooth PIN Vulnerability in LIXIL Satis Toilet

Published: 08/01/13
Version: 1.0

Vendor: LIXIL Corporation
Product: Satis
Version affected: Unknown

Product description:
The Satis is a "smart" toilet. It is controlled using LIXIL's "My Satis"
Android application, which communicates with the toilet using Bluetooth.

Finding 1: Hard-Coded Bluetooth PIN
*****Credit: Daniel Crowley of Trustwave SpiderLabs
CVE: CVE-2013-4866
CWE: CWE-259

The "My Satis" Android application has a hard-coded Bluetooth PIN of "0000"
as can be seen in the following line of decompiled code from the
application:

BluetoothDevice localBluetoothDevice =
BluetoothManager.getInstance().execPairing(paramString, "0000")

As such, any person using the "My Satis" application can control any Satis
toilet. An attacker could simply download the "My Satis" application and
use it to cause the toilet to repeatedly flush, raising the water usage and
therefore utility cost to its owner.

Attackers could cause the unit to unexpectedly open/close the lid, activate
bidet or air-dry functions, causing discomfort or distress to user.

Vendor Response:
No response received.

Remediation Steps:
No patch currently exists for this issue.

Revision History:
06/14/13 - Attempt to contact vendor
07/10/13 - Attempt to contact vendor
07/12/13 - Attempt to contact  vendor
08/01/13 - Advisory published

References
1. http://www.lixil.co.jp/lineup/toiletroom/shower/satis/

About Trustwave:
Trustwave is the leading provider of on-demand and subscription-based
information security and payment card industry compliance management
solutions to businesses and government entities throughout the world. For
organizations faced with today's challenging data security and compliance
environment, Trustwave provides a unique approach with comprehensive
solutions that include its flagship TrustKeeper compliance management
software and other proprietary security solutions. Trustwave has helped
thousands of organizations--ranging from Fortune 500 businesses and large
financial institutions to small and medium-sized retailers--manage
compliance and secure their network infrastructure, data communications and
critical information assets. Trustwave is headquartered in Chicago with
offices throughout North America, South America, Europe, Africa, China and
Australia. For more information, visit https://www.trustwave.com

About Trustwave SpiderLabs:
SpiderLabs(R) is the advanced security team at Trustwave focused on
application security, incident response, penetration testing, physical
security and security research. The team has performed over a thousand
incident investigations, thousands of penetration tests and hundreds of
application security tests globally. In addition, the SpiderLabs Research
team provides intelligence through bleeding-edge research and proof of
concept tool development to enhance Trustwave's products and services.
https://www.trustwave.com/spiderlabs

Disclaimer:
The information provided in this advisory is provided "as is" without
warranty of any kind. Trustwave disclaims all warranties, either express or
implied, including the warranties of merchantability and fitness for a
particular purpose. In no event shall Trustwave or its suppliers be liable
for any damages whatsoever including direct, indirect, incidental,
consequential, loss of business profits or special damages, even if
Trustwave or its suppliers have been advised of the possibility of such
damages. Some states do not allow the exclusion or limitation of liability
for consequential or incidental damages so the foregoing limitation may not
apply.

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