Date: Mon, 20 Feb 2017 12:18:30 +0100
From: Matthias Deeg <matthias.deeg@...s.de>
To: <fulldisclosure@...lists.org>
Subject: [FD] [SYSS-2016-117] ABUS Secvest (FUAA50000) - Missing Protection
 against Replay Attacks

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Advisory ID: SYSS-2016-117
Product: ABUS Secvest (FUAA50000)
Manufacturer: ABUS
Affected Version(s): v1.01.00
Tested Version(s): v1.01.00
Vulnerability Type: Missing Protection against Replay Attacks
Risk Level: Medium
Solution Status: Open
Manufacturer Notification: 2016-11-28
Solution Date: -
Public Disclosure: 2017-02-20
CVE Reference: Not yet assigned
Author of Advisory: Matthias Deeg (SySS GmbH)

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

Overview:

ABUS Secvest (FUAA50000) is a wireless alarm system with different
features.

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

"
* Convenient operation via the app (Android/iOS), integrated web
  browser and also at the alarm panel
* For up to 50 users with freely selectable control options
  (code/chip key/remote control)
* Active intrusion protection in combination with additional mechatronic
  wireless window/door locks
* Video verification of alarms via email, push notifications or via the
  app
* Up to 48 individually identifiable wireless detectors, eight control
  panels, 50 remote controls
* Integrated dialling device
* VdS Home certified and EN 50131-1 Level 2
* Alarm verification via the integration of up to six IP cameras
* 32 additional wireless outputs for flexible event control
* Switching to monitoring station via protocols possible
"

Due to an insecure implementation of the used 868 MHz radio
communication, the wireless alarm system ABUS Secvest is vulnerable to
replay attacks.

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

Vulnerability Details:

SySS GmbH found out that the radio communication protocol used by the
ABUS Secvest wireless alarm system (FUAA50000) and its remote control
(FUBE50013) 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 could successfully perform a replay attack as described in the
previous section using a software-defined radio and disarm an ABUS
Secvest wireless alarm system in an unauthorized way.

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

Solution:

SySS GmbH is not aware of a solution for this reported security
vulnerability.

For further information please contact the manufacturer.

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

Disclosure Timeline:

2016-11-28: Vulnerability reported to manufacturer
2016-12-05: Vulnerability reported to manufacturer again
2016-12-06: Manufacturer responded to emails
2016-12-08: Exchanged further information with manufacturer
2017-02-07: Asked manufacturer for current status concerning the
            reported security issue
2017-02-20: Public release of security advisory

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

References:

[1] Product website for ABUS Secvest wireless alarm system

https://www.abus.com/eng/Home-Security/Alarm-systems/Secvest-wireless-alarm-system/Alarm-panels-and-kits/Secvest-Wireless-Alarm-System
[2] SySS Security Advisory SYSS-2016-117

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2016-117.txt
[3] SySS GmbH, SySS Responsible Disclosure Policy
    https://www.syss.de/en/news/responsible-disclosure-policy/
[4] Plusminus video: Von wegen sicher - Wie leicht Alarmanlagen zu
knacken sind

http://www.daserste.de/information/wirtschaft-boerse/plusminus/videos/von-wegen-sicher-wie-leicht-alarmanlagen-zu-knacken-sind-100.html

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

Credits:

This security vulnerability was found by Matthias Deeg of 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

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

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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