Buffer overflow in phgrafx in QNX 6.2.1 and 6.3.0 allows local users to execute arbitrary code via a long command line argument.
http://www.vupen.com/english/advisories/2005/2669
http://www.securityfocus.com/archive/1/418105/100/0/threaded
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=384