The goal of trust exploitation attack is to compromise a trusted host, so that it could be used to stage attacks on other hosts in a network. Typically hosts inside the network of an enterprise are protected by a firewall placed at network boundary. So it is difficult to attack these internal hosts from outside. But these hosts are sometimes made accessible to a trusted host outside the firewall for legitimate purposes. If this trust outside host is compromised, it can be used to attack the inside hosts with relative ease.