[ubuntu] Possibility of attack on System

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http://ubuntuforums.org – Hi I have a host system which has two NIC card, eth0 and eth1. eth0 is connected to Internet via a router and it does not have an IP assigned to it. eth1 is connected to Intranet. The host has a Virutal machine which is configured only to use eth0 in bridge mode to go out to internet via the router. I use Virtual host to test malwares, with this being the case, Can my Host system which is running Linux ever get attacked over the Internet ? What if I introduce more system between eth0 and Internet Router, Can I attack the Host system which is hosting the Guest VM ? If my explanation is n (Hardware)