Any one running Snow Leopord ought to check this out – http://www.itproportal.com/portal/news/article/2009/10/14/apple-snow-leopard-bug-discovered-back-september/
Ouch! Poison Apple! Just installed Snow Leopard, so I may avoid logging in to a guest account till after the next update!
This is really bad. It amazes me I haven’t heard more about it yet. Anyway, I’ll still be running Leopard for a while.