Cracking the NAC (Network Access Controller)

These days, Network Access Controller (NAC) appliances are becoming more common on networks. NACs do give an increased level of security, but they are not the "end all" solution that their vendors' marketing and sales materials suggest that they are. We will show you a simple method of bypassing NAC controls on a company network.

The following information comes from a real hack to a real company we performed a while back. Of course, all the names and IP addresses have been changed to protect the company. This is not theory. This is a real world hack. The good thing for the company in this dramatization is that we are the good guys. The sad thing is that it only took about 30 minutes to figure this out, and maybe two hours to fully implement it.

We will be bypassing the NAC for the company widgetmakers.com. Widget Makers has two networks: one the corporate LAN (CorpNET), and the other a production network (ProdNET), containing classified data. The...