Vulnerability in ppl in HP-UX 10.x and earlier allows local users to gain root privileges by forcing ppl to core dump.
http://www.iss.net/security_center/static/7438.php
http://www.codetalker.com/advisories/vendor/hp/hpsbux9704-057.html
http://marc.info/?l=bugtraq&m=87602167420103&w=2