LIXIL Satis Toilet Hard-Coded Bluetooth PIN

`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/  
  
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