CVE-2000-1096
crontab by Paul Vixie uses predictable file names for a temporary file and does not properly ensure that the file is owned by the user executing the crontab -e command, which allows local users with write access to the crontab spool directory to execute arbitrary commands by creating world-writeable temporary files and modifying them while the victim is editing the file.
Date published : 2001-01-22
http://www.securityfocus.com/bid/1960
http://archives.neohapsis.com/archives/bugtraq/2000-11/0237.html