LSCFG in IBM AIX 5.2 and 5.3 does not create temporary files securely, which allows local users to corrupt /etc/passwd and possibly other system files via the trace file.
http://www.securityfocus.com/bid/15105
http://www-1.ibm.com/support/docview.wss?uid=isg1IY77638
http://www-1.ibm.com/support/docview.wss?uid=isg1IY77624