http://www.tomshardware.co.uk/2006/06/30/symantec_macosx_trojanhorse/
Just in case no one's seen this yet.
Edit: Sorry I didn't realise this was the same warning as this one. The article was dated a day later.
Symantec has issued a warning to Mac owners about a new malware software that exploits a vulnerability in the "launchD" service. The software could let an attacker get administrator or root access on any Macintosh system running OS X version 10.4.6 or earlier. Apple released a patch in version 10.4.7 this Wednesday.
Symantec has initially called the program a trojan horse, but the code hasn't yet been seen spreading in the wild. Kevin Finisterre, a security researcher at Digital Munition, created and released the code. Earlier this year, he also released the Inqtana worm which also targets Mac OS X.
Just in case no one's seen this yet.
Edit: Sorry I didn't realise this was the same warning as this one. The article was dated a day later.