-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2018-034 Product: ABUS Secvest (FUAA50000) Manufacturer: ABUS Affected Version(s): v3.01.01 Tested Version(s): v3.01.01 Vulnerability Type: Rolling Code - Predictable from Observable State (CWE-341) Risk Level: High Solution Status: Open Manufacturer Notification: 2018-11-21 Solution Date: - Public Disclosure: 2019-03-25 CVE Reference: CVE-2019-9863 Authors of Advisory: Matthias Deeg (SySS GmbH), Thomas Detert ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 the use of an insecure algorithm for rolling codes, an attacker is able to predict valid future rolling codes and can thus remotely control the ABUS Secvest wireless alarm system in an unauthorized way. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: Thomas Detert found out that the rolling codes implemented as replay protection (see SySS security advisory SYSS-2016-117 [2]) in the radio communication protocol used by the ABUS Secvest wireless alarm system (FUAA50000) and its remote control (FUBE50014, FUB50015) is cryptographically weak. Thus, an attacker observing the unencrypted radio signals of an ABUS FUBE50014 or FUBE50015 wireless remote control (see SySS security advisory SYSS-2018-035 [6]) is able to deduce the implemented rolling code algorithm and to correctly predict valid future rolling codes. This enables an attacker to remotely control affected wireless alarm systems in an unauthorized manner, for instance disarming the wireless alarm system at will. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. SySS GmbH could successfully perform a disarming attack against an ABUS Secvest wireless alarm system by exploiting the unencrypted signal transmission of the ABUS Secvest wireless remote controls FUBE50014 and FUBE50015 and the predictable rolling code implementation using either Mr. Detert's PoC tool, a developed Python tool for the RFCat-based radio dongle YARD Stick One (see [3]), or a eZ430-Chronos (see [4]) with a specially developed firmware. Successful disarming attacks against an ABUS Secvest wireless alarm system are shown in our SySS proof-of-concept video "ABUS Secvest Rolling Code PoC Attack" [8]. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: SySS GmbH is not aware of a solution for this reported security vulnerability. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 Support 2018-12-12: E-mail to ABUS Security Center Support asking if they are going to give some feedback regarding the reported security issue 2019-01-14: Updated information regarding remote control ABUS Secvest FUBE50015 2019-03-25: 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] Product website YARD Stick One https://greatscottgadgets.com/yardstickone/ [4] Product website for Texas Instruments eZ430-Chronos http://www.ti.com/tool/EZ430-CHRONOS [5] SySS Security Advisory SYSS-2018-034 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2018-034.txt [6] SySS Security Advisory SYSS-2018-035 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2018-035.txt [7] SySS GmbH, SySS Responsible Disclosure Policy https://www.syss.de/en/news/responsible-disclosure-policy/ [8] SySS Proof-of-Concept Video: ABUS Secvest Rolling Code PoC Attack https://youtu.be/pSdsMVn-7gM ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: 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) 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 -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE0fCgNfBs5nXNuQUU2aS/ajStTasFAlyUoKcACgkQ2aS/ajSt Tav+OBAAnJ6Vb6DVHhNWevqYKGjdn5eIIIHcfIrwe4bzKbXusNIVK9okNNkZT9i+ hRZfVSFR21uyamh950qNujjizNhGUnD3mezPx5ep0R7tPxhwcp67kgVjRef4PNEE p1rbhVFKKWlR4ygcmsAeKnnHQTGUK9UlYBlTt2RpPh4OCCRikPW0RuwfYuAxrvug kDpWV/XA2DivteL68jDYzCdXHG2toph1FGmfv5CTx0NiyKD/XSm952c17z/D78Qz AHvJT+xVMyZoUWqhSWHbwS+byBzVaXM2C3/89FBJ0YgolmrL1k8GvbYGe5fVlbBa +PcHpp2yRbhuDgANCdLGEvWMCaflbqUPZN/xyaySF5HaKmpULvU44QEtg9CjDKNv m0yyZDWaBAUMb574MsBZNAnFmyWPFuq1wd/hM5oxLoUyu6nbBlsLcpH/3E0LbJL0 ifNvk9KTsrvOItAV1fQl7/ccNcAeI+DB2yz44gtDaHjHvYCFjEHaQvws5a9L0PIF XYRuHI+BNNIIi2KwivpnR316MA2MgE0hEny708sdS879qP1eZ5gDXcrVvUPFDsbA DRH66TVPmoi2HMkKn95/PVLgqAYH0QFlGs3RkT+t7QS1K0gVCude4sTtxZFpT1A/ oxl2o8Kn4YhBDXvT9tUs1vaBFMO46MCgKF4yx3adPCRqK7twhiY= =eZ14 -----END PGP SIGNATURE-----