Apple ships XCode 1.5 with a feature for distributed compiling that ships with distcc, a Samba module that is susceptible to known exploits allowing for full user access to the target machine.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/36590/sdf1-apple.txt
Source: https://packetstormsecurity.com/files/36590/sdf1-apple.txt.html