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[SYSS-2016-066] Multi Kon Trade M2B GSM Wireless Alarm System - Missing Protection against Replay Attacks



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Advisory ID: SYSS-2016-066
Product: M2B GSM Wireless Alarm System
Manufacturer: Multi Kon Trade
Affected Version(s): Unspecified
Tested Version(s): Unspecified
Vulnerability Type: Missing Protection against Replay Attacks
Risk Level: Medium
Solution Status: Open
Manufacturer Notification: 2016-07-05
Solution Date: -
Public Disclosure: 2016-11-23
CVE Reference: Not yet assigned
Author of Advisory: Gerhard Klostermeier, SySS GmbH

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Overview:

The M2B GSM wireless alarm system by Multi Kon Trade (MKT) was tested
for possible security issues.

Some features of this alarm system as described by the manufacturer are
(see [1]):

* You will be noticed of any alarm by call or by SMS message.
* The alarm system has a battery which will last 6 to 8 hours in case
  of a blackout.
* You can pair up to 99 devices (sensors, remote control, etc.).
* You do not have to run any cables. Everything is wireless.
* It is possible to trigger alarms in case of fire, even if the
  alarm is disabled.
* It is possible to trigger the alarm with a delay.

Due to an insecure implementation of the used 433 MHz radio
communication, the wireless alarm system M2B GSM is vulnerable to
replay attacks.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Vulnerability Details:

SySS GmbH found out that the radio communication protocol used by the
M2B GSM wireless alarm system and its remote control is not protected
against replay attacks. Therefore, an attacker can record the radio
signal of a wireless remote control, for example using a software
defined radio, when the alarm system is disarmed by its owner, and play
it back at a later time in order to disable the alarm system at will.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Proof of Concept (PoC):

SySS GmbH build a small device that is able to perform replay attacks
against the 433 MHz radio communication of the M2B GSM wireless alarm
system, for example in order to arm and disarm the wireless remote
system in an unauthorized manner.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Solution:

Do not use the 433 MHz remote control to arm or disarm the system.
Instead it is recommended to use the app for iOS and Android smartphones
or to arm and disarm the system manually with the on-board keypad.
(Solution as suggested by the vendor.)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclosure Timeline:

2016-07-05: Vulnerability reported to manufacturer
2016-10-13: Response from the vendor with the solution on how to
            mitigate the risk
2016-11-23: Public release of security advisory

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

References:

[1] M2B GSM Wireless Alarm System, Multi Kon Trade
    http://multikontrade.de/GSM-Funk-Alarmanlage
[2] PT2260 Remote Control Encoder, Princeton Technology Corp.
    http://www.princeton.com.tw/Portals/0/Product/PT2260_4.pdf
[3] SySS Security Advisory SYSS-2016-066
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2016-066.txt
[4] SySS GmbH, SySS Responsible Disclosure Policy
    https://www.syss.de/en/news/responsible-disclosure-policy/

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Credits:

This security vulnerability was found by Gerhard Klostermeier of SySS
GmbH.

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

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclaimer:

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
site.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en

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