PPPDialer for Mac OS X 10.2.8 through 10.3.5 allows local users to overwrite system files via a symlink attack on PPPDialer log files.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17298
http://www.securityfocus.com/bid/11139
http://www.securityfocus.com/advisories/7148
http://www.ciac.org/ciac/bulletins/o-212.shtml