Many of us use ssh tunnelling. It is very convenient, to establish secure connections ever when you are on a unsecured network or environment, like in a hotel or internet cafe. However, ssh tunnelling can be an ENORMOUS security risk. This article explains it very well in an easy understandable way (and it has some comments worth reading, too):
community.infosecinstitute.com/discussion/67117/circumventing-network-security-via-ssh-tunneling