Internet Message (IM) 141-18 and earlier uses predictable file and directory names, which allows local users to (1) obtain unauthorized directory permissions via a temporary directory used by impwagent, and (2) overwrite and create arbitrary files via immknmz.
http://www.securityfocus.com/bid/6307
http://www.redhat.com/support/errata/RHSA-2003-039.html
http://www.iss.net/security_center/static/10767.php
http://www.iss.net/security_center/static/10766.php
http://www.debian.org/security/2002/dsa-202