The Control C has been around for quite a while and even works on OS X 10.2.8 also. It will even work on a laptop that has a usb keyboard plugged in to it. Control C will actually break in on the the startup process and is not exactly the same as Single Users mode (Control S).

The only "real" protection against this is to enable a Open Firmware password on the affected mac.

Here's a nice article that will tell you how to do it: http://www.macdevcenter.com/pub/a/ma...re_tibook.html

Updating to OS X 10.3.x is a way better soultion and is not affected by this "bug"


Ohh and one more note: Even the OPFW password is bypassable if you have physcial access to the inside of the computer. Just pull or add a RAM chip, startup and zap PRAM 3 times and presto - Instant Bypass Acess!!!