A vulnerability was found in Multi Kon Trade M2B GSM Wireless Alarm System (unknown version). It has been rated as critical. This issue affects an unknown code block. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability.

The weakness was presented 11/23/2016 by Gerhard Klostermeier with SYSS as [SYSS-2016-064] Multi Kon Trade M2B GSM Wireless Alarm System - Improper Restriction of Excessive Authentication Attempts (CWE-307) as confirmed mailinglist post (Full-Disclosure). The advisory is shared at seclists.org. The public release was coordinated in cooperation with Multi Kon Trade. The attack may be initiated remotely. The requirement for exploitation is a simple authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 141 days. During that time the estimated underground price was around $0-$5k.

The best possible mitigation is suggested to be Workaround. The mailinglist post contains the following remark:

An extra anti-jammer device is purchasable by the Vendor. This sensor should detect malicious devices that are trying to disarm system using the brute-force method. If such a device is detected the alarm will be triggered. (Solution as suggested by the vendor.)

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• Multi Kon Trade

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• M2B GSM Wireless Alarm System

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