Buffer overflow in lpd in bos.rte.printers in AIX 5.2 and 5.3 allows local users with printq group privileges to gain root privileges.
http://www.vupen.com/english/advisories/2007/2678
http://www-1.ibm.com/support/docview.wss?uid=isg1IY98560
http://www-1.ibm.com/support/docview.wss?uid=isg1IY98339