csstart program in iCal 2.1 Patch 2 searches for the cshttpd program in the current working directory, which allows local users to gain root privileges by creating a Trojan Horse cshttpd program in a directory and calling csstart from that directory.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5757
https://euvd.enisa.europa.eu/vulnerability/EUVD-2000-1059
http://www.securityfocus.com/bid/1769
http://www.atstake.com/research/advisories/2000/a100900-1.txt