The default configuration of LPRng print spooler in Red Hat Linux 7.0 through 7.3, Mandrake 8.1 and 8.2, and other operating systems, accepts print jobs from arbitrary remote hosts.
http://www.securityfocus.com/bid/4980
http://www.redhat.com/support/errata/RHSA-2002-089.html
http://www.linux-mandrake.com/en/security/2002/MDKSA-2002-042.php