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Date: Mon, 25 Mar 2019 08:04:23 GMT
Subject: [SYSS-2018-036]: ABUS Secvest Remote Control - Denial of Service
 - Uncontrolled Resource Consumption (CWE-400)

Hash: SHA512

Advisory ID: SYSS-2018-036
Product: ABUS Secvest Remote Control (FUBE50014, FUBE50015)
Manufacturer: ABUS
Affected Version(s): n/a
Tested Version(s): n/a
Vulnerability Type: Denial of Service - Uncontrolled Resource Consumption (CWE-400)
Risk Level: Low
Solution Status: Open
Manufacturer Notification: 2018-11-21
Solution Date: -
Public Disclosure: 2019-03-25
CVE Reference: CVE-2019-9860
Authors of Advisory: Matthias Deeg (SySS GmbH), Thomas Detert



ABUS Secvest FUBE50014 and FUBE50015 are wireless remote controls for
the ABUS Secvest wireless alarm system.

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

* User-friendly remote control with easily identifiable symbols
* Features ‘arm’, ‘disarm’ and ‘status query’ keys
* 8 LEDs provide an overview and display current system status
* Button for custom configuration available (Secvest wireless alarm
  system only)
* Optional manual panic alarm available (Secvest wireless alarm system
* Encrypted signal transmission
* Rolling Code
  Thanks to the rolling code process this product is protected against
  so-called replay attacks. All controlling signals between this product
  and the Secvest alarm panel are in individualised and thus, are not
  able to be reproduced by third parties. This process is protected
  from third party tampering, and exceeds the requirements of the
  DIN EN 50131-1 level 2 security standard.

Due to unencrypted signal communication and predictability of rolling
codes, an attacker can "desynchronize" an ABUS Secvest wireless remote
control regarding its controlled Secvest wireless alarm system, so that
sent commands by the remote control are not accepted anymore.


Vulnerability Details:

Thomas Detert found out that the claimed "Encrypted signal transmission"
of the Secvest wireless remote control FUBE50014 is not present (see
SySS security advisory SYSS-2018-035 [2]) and that the implemented
rolling codes are predictable (see SySS security advisory SYSS-2018-034

By exploiting these two security issues, an attacker can simply
desynchronize a wireless remote control by observing the current rolling
code state, generating many valid rolling codes, and use them before the
original wireless remote control.

The Secvest wireless alarm system will ignore sent commands by the
wireless remote control until the generated rolling code happens to
match the window of valid rolling code values again. Depending on the
number of used rolling codes by the attacker, a resynchronization
without actually reconfiguring the wireless remote control could take
quite a lot of time and effectless button presses.

SySS found out that the new ABUS Secvest remote control FUBE50015 is
also affected by this security vulnerability.


Proof of Concept (PoC):

Thomas Detert developed a Teensy-based PoC tool using a CC1101 sub-1GHz
transceiver that allows disarming the alarm system in an unauthorized
way. He provided his tool including documentation and source to SySS
GmbH for responsible disclosure purposes. 

Based on Mr. Detert's PoC tool, SySS GmbH developed a Python tool for
the RFCat-based radio dongle YARD Stick One (see [4]) for demonstrating
this simple denial-of-service (DoS) attack against the ABUS Secvest
wireless remote controls FUBE50014 and FUBE50015. This tool simply
generates many valid rolling codes based on the current observed state
and uses them resulting in desynchronizing the original wireless remote



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


Disclosure Timeline:

2018-11-21: Vulnerability reported to manufacturer
2018-11-28: Vulnerability reported to manufacturer once more
2018-12-12: E-mail to ABUS support asking if they are going to give
            some feedback regarding the reported security issue
2018-12-12: Phone call with ABUS support, the reported security
            advisories were forwarded to the ABUS Security Center
2018-12-12: E-mail to ABUS Security Center Support asking if they are
            going to give some feedback regarding the reported security
2019-01-14: Updated information regarding remote control ABUS Secvest
2019-03-25: Public release of security advisory



[1] Product website for ABUS Secvest wireless remote control
[2] SySS Security Advisory SYSS-2018-035
[3] SySS Security Advisory SYSS-2018-034
[4] Product website YARD Stick One
[5] SySS Security Advisory SYSS-2018-036
[6] SySS GmbH, SySS Responsible Disclosure Policy



This security vulnerability was found by Thomas Detert.

Mr. Detert reported his finding to SySS GmbH where it was verified and
later reported to the manufacturer by Matthias Deeg.

E-Mail: matthias.deeg (at)
Public Key:
Key fingerprint = D1F0 A035 F06C E675 CDB9 0514 D9A4 BF6A 34AD 4DAB



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



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