If you work in an office that uses the popular CiscoUnified IP Phone 7900 Series, prepare to feel violated. A couple of security researchers have published details on a security vulnerability that allows a nefarious hacker to turn the phones into eavesdropping devices. The hack allows people to listen in on private phone calls as well as to nearby conversations.
The hack is executed with a small piece of hardware plugged into the local serial port of the Cisco phone. Once the device is connected to the phone, the hacker is able to execute code allowing them to remotely monitor phone calls and turn on the phone

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