-----BEGIN PGP SIGNED MESSAGE-----
Advisory ID: SYSS-2016-059
Product: Microsoft Wireless Desktop 2000
Affected Version(s): Ver. A
Tested Version(s): Ver. A
Vulnerability Type: Insufficient Verification of Data Authenticity (CWE-345)
Mouse Spoofing Attack
Risk Level: Medium
Solution Status: Open
Manufacturer Notification: 2016-06-28
Solution Date: -
Public Disclosure: 2016-07-29
CVE Reference: Not yet assigned
Authors of Advisory: Matthias Deeg and Gerhard Klostermeier (SySS GmbH)
Microsoft Wireless Desktop 2000 is a wireless desktop set consisting of
a mouse and a keyboard.
The manufacturer describes the product as follows (see ):
"This keyboard features Advanced Encryption Standard (AES) technology,
which is designed to help protect your information by encrypting your
keystrokes. Each keyboard is permanently paired with its receiver at
the factory - no key information is ever shared over the air."
Due to unencrypted and unauthenticated mouse data communication, the
wireless desktop set Microsoft Wireless Desktop 2000 is prone to mouse
The SySS GmbH found out that the mouse of the wireless desktop set
Microsoft Wireless Desktop 2000 is prone to spoofing attacks, as the
mouse data communication is unencrypted and unauthenticated.
An attacker can analyze the unencrypted mouse data packets of the 2.4
GHz radio communication sent by the mouse to the receiver (USB dongle)
in order to learn the used protocol. By knowing the used mouse data
protocol, it is possible to spoof mouse actions like mouse movements or
mouse clicks by sending forged data packets.
Thus, an attacker is able to remotely control the mouse pointer of a
target system that is operated with the wireless desktop set Microsoft
Wireless Desktop 2000. If the graphical user interface of the victim's
system is unlocked, an attacker can for example send a list of mouse
actions that start the virtual on-screen keyboard of the operating
system and execute arbitrary commands in the context of the currently
logged in user, for instance a download and execute attack vector.
As the attacker may not have an unobstructed view to the target system's
screen and may know the used operating system, the screen resolution, or
the current mouse settings, this kind mouse spoofing attack is based on
heuristics. But concerning an unlocked and unattended system, an
attacker can simply try different attack vectors for different target
system configurations sequentially.
Proof of Concept (PoC):
The SySS GmbH could successfully perform mouse spoofing attacks against
a target system operated with the wireless desktop set Microsoft
Wireless Desktop 2000 using an in-house developed software tool in
combination with the USB radio dongle Crazyradio PA (see ).
The manufacturer Microsoft responded to the reported security issue that
this behavior is by design and that there will be no security update.
2016-06-28: Vulnerability reported to manufacturer
2016-06-28: Manufacturer acknowledges e-mail with SySS security advisory
2016-07-22: Statement from manufacturer concerning reported security
2016-07-29: Public release of the security advisory
 Product website for Microsoft Wireless Desktop 2000
 Product website for Crazyradio PA
 SySS Security Advisory SYSS-2016-059
 SySS Responsible Disclosure Policy
This security vulnerability was found by Matthias Deeg and Gerhard
Klostermeier of the SySS GmbH.
E-Mail: matthias.deeg (at) syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Matthias_Deeg.asc
Key fingerprint = D1F0 A035 F06C E675 CDB9 0514 D9A4 BF6A 34AD 4DAB
E-Mail: gerhard.klostermeier (at) syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Gerhard_Klostermeier.asc
Key fingerprint = 8A9E 75CC D510 4FF6 8DB5 CC30 3802 3AAB 573E B2E7
The information provided in this security advisory is provided "as is"
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible. The
latest version of this security advisory is available on the SySS Web
Creative Commons - Attribution (by) - Version 3.0
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
-----END PGP SIGNATURE-----