a local firewall (hands off & little snitch are handy commercial ones for mac) will help you catch these kinds of info leaks (i caught this one a long time ago because of mine).
it does come with a time cost however--little popups every time you launch a new application or connect to a new service that you have to evaluate and handle, since you haven't set rules for them already.
but i do distinctly remember getting alerts for this and being annoyed enough to go figure out how to disable the feature in iterm2 (it was at least a couple years ago, so my memory is hazy).
maybe someone with more recent experience can clear up the mystery for us. =)
it does come with a time cost however--little popups every time you launch a new application or connect to a new service that you have to evaluate and handle, since you haven't set rules for them already.