Pentest Limited Security Advisory

WIDCOMM Bluetooth Connectivity Software Buffer Overflows

Advisory Details
----------------
Title: WIDCOMM Bluetooth Connectivity Software Buffer Overflows
Announcement date: 11 August 2004
Advisory Reference: ptl-2004-03
CVE Name: CAN-2004-0775
Products: WIDCOMM Bluetooth Connectivity Software
Vulnerability Type : Buffer Overflow
Vendor-URL: http://www.widcomm.com
Vendor-Status: Fixed in release 3.0
Remotely Exploitable: Yes
Locally Exploitable: N/A
Advisory URL: http://www.pentest.co.uk/documents/ptl-2004-03.html

Vulnerability Description
--------------------------
WIDCOMM's products provides a full range of Bluetooth connectivity
solutions for PCs, PDAs, mobile phones, headsets, digital cameras,
access points, and various output devices.

An unauthenticated remote attacker can submit various malformed service
requests via Bluetooth, triggering a buffer overflow and executing
arbitrary code on the vulnerable device.

On Windows platforms this allows arbitrary code execution under the
context of the currently logged on user account.


Vulnerable Versions
--------------------

WIDCOMM supply their Bluetooth Communications software to other
companies to allow them to integrate Bluetooth technology into their
devices. They also supply Bluetooth SDK's to enable developers to create
applications that use Bluetooth. Therefore it may not be immediately
apparent that you are using the WIDCOMM Bluetooth software and version
numbers may vary.

WIDCOMM's website (http://www.widcomm.com/Partners/index.asp) reports
the following companies as customers or partners with WIDCOMM:

Logitech
Samsung Electro-Mechanics
Sony
Texas Instruments
Compaq Computer Corporation
Dell
National Semiconductor
Matsushita Electric Industrial Co., Ltd.
Wistron NeWeb Corporation
TDK Systems Europe
Zeevo
Cambridge Silicon Radio
Billionton
Broadcom Corporation
LG Innotek
MSI
Fujitsu Siemens Computers
Philips
Silicon Wave
Seiko Instruments Inc.
TECOM
Plantronics
Mobilian
Fujitsu Media Devices Limited
OKI Electric Industry Co. Ltd.
FIC
Costar
Brother
Alcatel
Atmel
Conexant Systems, Inc.
Microtune
OSK


Pentest Limited have tested for the reported vulnerabilities against
BTStackServer version 1.3.2.7 and 1.4.2.10  on both Windows XP and
Windows 98 which ships with MSI Bluetooth Dongles. We have also tested
this against an HP IPAQ 5450 running WinCE 3.0 with Bluetooth software
version 1.4.1.03.

Pentest Limited have also written a proof of concept exploit for Windows
XP.

Whilst the above platforms are the only platforms tested and confirmed
to be exploitable by Pentest Limited, discussions with the vendor lead
us to believe that are all versions prior to version BTW & BT-CE/PPC 3.0
are affected by this vulnerability.

WIDCOMM has not confirmed whether BT-PPC/Phone Edition, BT-Smartphone,
BTE-Mobile or BTE are vulnerable.


Vendor Status
--------------
WIDCOMM:
14-11-2003 - Initial Pentest Limited Notification
14-11-2003 - Notification acknowledged by WIDCOMM, request more detail
20-11-2003 - Pentest notify WIDCOMM of another vulnerability
06-01-2004 - Pentest send chase up Email without reply
13-01-2004 - Another email
13-01-2004 - WIDCOMM reply saying they are still working on it
21-01-2004 - Pentest email WIDCOMM that they have written a POC exploit
23-01-2004 - WIDCOMM reply saying they have resolved issue and fix
       will be available in next release.
10-02-2004 - Pentest ask for an update on expected release date
11-02-2004 - WIDCOMM plan February/early March realease date
29-03-2004 - Pentest ask for update
12-05-2004 - Pentest ask for update
12-07-2004 - Pentest send chase up Email without reply
26-07-2004 - Pentest ask whether a patches will be released for older 
versions
03-08-2004 - WIDCOMM respond. No date set for new release and no patch
       will be made available for older versions.


Fix
---

Until version 3 of the WIDCOMM software becomes available from WIDCOMM
or their customers/partners Pentest Limited recommend that end users
stop using the vulnerable WIDCOMM Bluetooth software or set their
Bluetooth device configuration to be non-discoverable or hidden. This
will not stop the device from being vulnerable but it may limit the
exposure.


Credit
------

These vulnerabilities were discovered by Mark Rowe and Matt Moore from
Pentest Limited.