Format string vulnerability in the VPN daemon (vpnd) in Apple Mac OS X 10.3.9 and 10.4.9 allows local users to execute arbitrary code via the -i parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34505
http://www.vupen.com/english/advisories/2007/1939
http://www.securitytracker.com/id?1018125
http://www.securityfocus.com/bid/24208
http://www.securityfocus.com/bid/24144
http://www.securityfocus.com/archive/1/469889/100/0/threaded
http://www.securityfocus.com/archive/1/469882/100/0/threaded
http://secunia.com/advisories/25402
http://lists.apple.com/archives/security-announce/2007/May/msg00004.html