Format string vulnerability in startprinting() function of printjob.c in BSD-based lpr lpd package may allow local users to gain privileges via an improper syslog call that uses format strings from the checkremote() call.
http://www.securityfocus.com/bid/1711
http://www.redhat.com/support/errata/RHSA-2000-066.html
http://www.iss.net/security_center/static/5286.php