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A popular smart home security system can be remotely disarmed, researchers say

A cybersecurity company says a popular smart home security system has a pair of vulnerabilities that can be exploited to disarm the system altogether.

Rapid7 found the vulnerabilities in the Fortress S03, a home security system that relies on Wi-Fi to connect cameras, motion sensors, and sirens to the internet, allowing owners to remotely monitor their home anywhere with a mobile app. The security system also uses a radio-controlled key fob to let homeowners arm or disarm their house from outside their front door.

But the cybersecurity company said the vulnerabilities include an unauthenticated API and an unencrypted radio signal that can be easily intercepted.

Rapid7 revealed details of the two vulnerabilities on Tuesday after not hearing from Fortress in three months, the standard window of time that security researchers give to companies to fix bugs before details are made public. Rapid7 said its only acknowledgment of its email was when Fortress closed its support ticket a week later without commenting.

Fortress owner Michael Hofeditz opened but did not respond to several emails sent by TechCrunch with an email open tracker. An email from Bottone Riling, a Massachusetts law firm representing Fortress, called the claims “false, purposely misleading and defamatory,” but did not provide specifics that it claims are false, or if Fortress has mitigated the vulnerabilities.

Rapid7 said that Fortress’ unauthenticated API can be remotely queried over the internet without the server checking if the request is legitimate. The researchers said by knowing a homeowner’s email address, the server would return the device’s unique IMEI, which in turn could be used to remotely disarm the system.

The other flaw takes advantage of the unencrypted radio signals sent between the security system and the homeowner’s key fob. That allowed Rapid7 to capture and replay the signals for “arm” and “disarm” because the radio waves weren’t scrambled properly.

Vishwakarma said homeowners could add a plus-tagged email address with a long, unique string of letters and numbers in place of a password as a stand-in for a password. But there was little for homeowners to do for the radio signal bug until Fortress addresses it.

Fortress has not said if it has fixed or plans to fix the vulnerabilities. It’s not clear if Fortress is able to fix the vulnerabilities without replacing the hardware. It’s not known if Fortress builds the device itself or buys the hardware from another manufacturer.

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