Here is a demo of how an open USB port can be used by a hacker with a 30 to 60 sec access using a “USBDriveBy”.
The device which is small enough to be worn around the neck (or carried in the pocket) when connected to a USB port will emulate as a mouse or key board and establish connect to the OS and establish a remote control to the hacker’s computer completely compromising the computer.
Now we need to start worrying about how to lock and unlock USB ports. Refer here for ways to disable USB ports in windows.
Naavi