Exploitalert - Database of Exploits

ABUS Secvest Hybrid Module FUMO50110 Authentication Bypass

CVE	Category	Price	Severity
CVE-2020-14158	CWE-288	$5,000	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2020-08-01

CPE
cpe:cpe:/h:abus:secvest_hybrid_module:fumo50110

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	Low	C	There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity	Low	I	Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability	None	A	There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.

https://cxsecurity.com/ascii/WLB-2020080009

ABUS Secvest Hybrid Module FUMO50110 Authentication Bypass

Advisory ID: SYSS-2020-015 Product: ABUS Secvest Hybrid module (FUMO50110) Manufacturer: ABUS Affected Version(s): N/A Tested Version(s): N/A Vulnerability Type: Authentication Bypass Using an Alternate Path or Channel (CWE-288) Risk Level: High Solution Status: Open Manufacturer Notification: 2020-04-03 Solution Date: - Public Disclosure: 2020-07-30 CVE Reference: CVE-2020-14158 Authors of Advisory: Michael Rttgers, Thomas Detert, Matthias Deeg (SySS GmbH) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: The ABUS Secvest Hybrid module is an expansion module that allows to bridge between the ABUS Secvest alarm panel [1] and further wired systems. Some of the supported features as described by the manufacturer are (see [2]): " * The hybrid module turns wireless into wired and wired into wireless. And alarm systems into combined security systems. By connecting to the ABUS wAppLoxx, the property benefits from intelligent access management while simultaneously eliminating false alarms. * In combination with Secvest, the hybrid module can also be used to implement numerous smart home scenarios. Garage doors, household lighting or rolling shutters can be operated in this way, for example. " Due to missing security features regarding confidentiality and integrity of the used radio communication, different radio-based attacks are possible. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: The hybrid module does not have any security mechanism that ensures confidentiality or integrity of RF packets that are exchanged between the ABUS Secvest alarm panel and the ABUS Secvest Hybrid module. Thus, an attacker can spoof messages of the ABUS Secvest Hybrid module based on sniffed status RF packets that are issued by the ABUS Secvest Hybrid module on a regularly basis (~2.5 minutes). One of the suggested use cases in [3] (page 27) is the link of a wAppLoxx to the ABUS Secvest alarm panel via the ABUS Secvest Hybrid module. In the intended use case, this allows to disarm the ABUS Secvest panel simultaneously when access by the wAppLoxx system is granted to a properly authenticated user. By spoofing the ABUS Secvest Hybrid module RF messages, an attacker is able to bypass the authentication of wAppLoxx in such a system configuration without the need of any user interaction. For clarity, the authentication of the wAppLoxx cylinder itself is not influenced by this attack, and an attacker still needs to find access to the protected object. The input channels of the ABUS Secvest Hybrid module are simply mapped to a 4-byte field in the RF packages. Modifying those bytes allows an attacker to simulate any change on the ABUS Secvest Hybrid module inputs. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): Michael Rttgers and Thomas Detert developed a PoC tool using the RFCat-based radio dongle YARD Stick One [4] that allows spoofing RF packets and thus bypassing the authentication of wAppLoxx in the described system configuration. They provided their tool including documentation and source code to SySS GmbH for responsible disclosure purposes. SySS GmbH could successfully perform the described authentication bypass attack against an ABUS Secvest wireless alarm system used with the ABUS Secvest Hybrid module (FUMO50110). The described spoofing attack is demonstrated in the SySS proof of concept video titled "ABUS Secvest Spoofing Attack" which is available on the SySS YouTube Channel "Pentest TV" [7]. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: SySS GmbH is not aware of a solution for this reported security vulnerability. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2020-04-03: Vulnerability reported to manufacturer 2020-07-30: 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] Product Website for ABUS Secvest Hybrid Module https://www.abus.com/uk/Home-Security/Alarm-systems/Secvest-wireless-alarm-system/Control-devices-and-extensions/Secvest-Hybrid-module [3] Installation Instructions and User Guide https://www.abus.com/var/ImagesPIM/d110001/medias/docus/22/FUMO50110_BDA_INT_1_3.pdf [4] Product Website YARD Stick One https://greatscottgadgets.com/yardstickone/ [5] SySS Security Advisory SYSS-2020-015 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-015.txt [6] SySS GmbH, SySS Responsible Disclosure Policy https://www.syss.de/en/news/responsible-disclosure-policy/ [7] SySS Proof of Concept Video: ABUS Secvest Spoofing Attack https://www.youtube.com/watch?v=PidiWcB0tmI ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Michael Rttgers and Thomas Detert. Mr. Rttgers and Mr. Detert reported this finding to SySS GmbH where it was verified and later reported to the manufacturer by Matthias Deeg. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 website. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Copyright: Creative Commons - Attribution (by) - Version 3.0 URL: http://creativecommons.org/licenses/by/3.0/deed.en

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