But if you listen to the MAC faithful this type of attack is impossible on the MAC. So how can it be possible if MAC is so secure? Also using Windows as your scapegoat isn't exactly sound reasoning with these guys becuase they spend their time telling why windows is so bad and MAC is so good. To say well Windows has the issue to is a joke...especially when the issue is in APPLE software.
MAC (Media Access Control, part of OSI Layer 2) is not very secure, and nobody's claimed so. It's easy to spoof a MAC address. You can also change it, but that requires SU in UNIX (which almost nobody runs under, even in OS X) or Administrator in Windows (which most people run under).
Oh, you were maybe talking about Mac OS X?
"But if you listen to the MAC faithful this type of attack is impossible on the MAC."
That is not the case at all. OS X is based on Unix and windows is based on well windows. Nobody every said that an application run by uninformed users could not cause un-intended harm to the PC. The point is the Windows OS is very insecure because it 'effectively" in normal ops is not tiered into an SU hierarchy.
That said, carelessness, passwords on posted notes, inside jobs, etc are the real security problems. But to think Mac OS X and Windows OS have equal security and reliability is just pure ignorance. Buy a Mac and try it.