Terminal 1.3 in Apple Mac OS X 10.2 allows remote attackers to execute arbitrary commands via shell metacharacters in a telnet:// link, which is executed by Terminal.app window.
http://lists.apple.com/archives/security-announce/2002/Sep/msg00001.html
http://apple.slashdot.org/apple/02/09/21/122236.shtml?tid=172