Stack-based buffer overflow in the Core Foundation Library in Mac OS X 10.3.5 and 10.3.6, and possibly earlier versions, allows local users to execute arbitrary code via a long CF_CHARSET_PATH environment variable.
http://www.securityfocus.com/bid/13224
http://www.idefense.com/application/poi/display?id=219&type=vulnerabilities
http://lists.apple.com/archives/security-announce/2005/Mar/msg00000.html