Dell E-Port Plus User Manual download pdf (Page 14)

From an implant perspective, the hardware modification required would be more complex, as a hub

would need to be inserted between the current Ethernet connections on the docking station PCB and

the RJ-45 Ethernet socket so that it was situated between the docked laptop and the Ethernet cable

connected to the rear of the docking station.

5.3 Passive video monitoring

The attacker may wish to see what is being displayed on the target's monitor, as sensitive

information could be obtained. This could be performed using a Video Frame Grabber like

VideoGhost

[21]

. Figure 19 shows the different connectors on the VideoGhost:

 Red circle - USB connector, used to retrieve screenshots via a mass-storage device

 Green circle - VGA socket into which a display would be connected

 White circle - VGA plug, which connects to the VGA socket on a PC

Figure 19: VideoGhost VGA frame grabber

5.3.1 Where to tap

The pins associated with the VGA port are easily available (Figure 20); however, the VideoGhost

needs to be connected inline between the PCB and the VGA connector. Therefore, the connector

would need to be de-soldered and replaced with a non-PCB-mount VGA connector, and then the

appropriate connections could be made to the VideoGhost and to the PCB.

Under normal circumstances, this would be annoying but not a major problem, however, Figure 21

shows that the VGA connector (indicated by the yellow arrow) is hidden away in a kind of cage

formed by the wires associated with the parallel port connector (the pink block at the top). This is a

multi-port module that contains the parallel port, VGA port and also a serial port (indicated by the

green arrow). This configuration means that in order to insert the VideoGhost we'd need to first de-

solder the parallel port, VGA port and serial port connections so that the entire module could be

removed to perform the tap. Also, as all three connectors are part of the same module, they would

need to be replaced with individual connectors, as the VGA connector would be replaced for a non-

PCB-mount variant.

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Dell E-Port Plus User Manual Page 14