No need for AV tools on Linux, eh?

[Joe Zeff]

On 02/10/2011 01:06 PM, jdow wrote:
> For all of you with your touching faith that Linux is invulnerable I
> offer up this message from the Spam Assassin list. This is an exploit
> into a piece of software running with root privileges - in your email
> system.

Is this a "proof of concept," or is it actually in the wild?  I also 
note that it isn't listed as affecting Fedora 14.