A proof-of-concept worm that can theoretically affect Mac OS X has been built, according to an anonymous security researcher.

Computerworld reports a researcher has posted their claims on the Information Security Sell Out blog, and that the worm was created in "a few hours".

The worm exploits an unpatched bug in mDSNResponder, itself a component in Apple's Bonjour zero-configuration networking solution.

The researcher claims the vulnerability could give malware makers remote root access.

This same researcher has also been identified as the source of widely-reported claims that the AirPort-based wireless network at a security conference in April was cracked, though this claim was never proved.