Third-party car alarms that are Internet-connected and attach to the CAN bus are a vector for all sorts of malicious activity.
"Key relay attacks against keyless entry vehicles are well known. Many 3rd party car alarm vendors market themselves as solutions to this.
"We have shown that fitting these alarms can make your vehicle EVEN LESS SECURE! These alarms can expose you to hijack, may allow your engine to be stopped whilst driving and it may even be possible to steal vehicles as a result."
https://www.pentestpartners.com/security-blog/gone-in-six-seconds-exploiting-car-alarms/
"Key relay attacks against keyless entry vehicles are well known. Many 3rd party car alarm vendors market themselves as solutions to this.
"We have shown that fitting these alarms can make your vehicle EVEN LESS SECURE! These alarms can expose you to hijack, may allow your engine to be stopped whilst driving and it may even be possible to steal vehicles as a result."
https://www.pentestpartners.com/security-blog/gone-in-six-seconds-exploiting-car-alarms/
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