Good question. As I understand it, the USB stick can present itself as a keyboard, which is automatically mounted, and begins entering a series of keystrokes that program the system to compromise itself.
In essence, modern OS's give "autorun" privilege to keyboards and mice. That's the HID in this discussion -- Human Interface Device.
In essence, modern OS's give "autorun" privilege to keyboards and mice. That's the HID in this discussion -- Human Interface Device.