UCSniff can be placed on a laptop and put in a network where it will VLAN hop untill it finds the VoIP VLAN channel. It then throws out spoofed ARP packets like a man-in-the-middle attack and gets all voice and video traffic thrown to itself. Together with a plugin called VideoJak they can then insert video loops into the stream, meaning that whoever sees the camera output (the guard) will only see the loop and not what the webcam is seeing.
Surveillance camera hack swaps live feed with spoof video • The Register.
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