UNIX is not hacker or vulnerability proof, neeither is Linux. The only system that can be hacker proof is one disconnected from the net. The security guys are not spreading fud. The only reason why UNIX wasnt cracked more in the 70's
is becausethe Internet wasnt around.
Hackers had the same amount of time to exploit Unix as they have Windows and Dos. Network connections had nothing to do with it. Windows and Dos falls every time. Unix doesnt and Linux most certainly does not. Its the design of the system, while Microsoft
was busy trying to build an OS with which to lock in their monopoly the Linux and even Unix groups were building a more secure OS that doesnt crack under pressure. Bill Gates put out a memo having to tell his programmers to pay attention to security, which
showed Microsoft didnt care from day one. When have you ever seen a memo like that have to come from the kernel group or ANY Linux or Unix vendor for that matter?