F-Secure has pin-pointed another vulnerability in the Apple OS X operating system. The first such malware for OS X was reported last week and targeted chat programs. This latest vulnerability, a worm called OSX/Inqtana-A, takes aim at OS X's Bluetooth stack.

The chances of the worm spreading are slim as Apple patched the vulnerability in May of 2005. "It's disturbing to see a second worm for Mac OS X so soon after the first, but it should be remembered that this is only two compared to well over 100,000 viruses for Microsoft operating systems. The good news is that Inqtana is not going to spread successfully in the wild, but this announcement will still be a shock to those in the Mac community who thought hackers were not interested in their operating system," said Graham Cluely, a consultant for Sophos.

OS X is not invulnerable to attacks, but compared to users in the Windows world, Mac users have it pretty easy.