pioout in IBM AIX 5.3 SP6 allows local users to execute arbitrary code by specifying a malicious library with the -R (ParseRoutine) command line argument.
ftp://aix.software.ibm.com/aix/efixes/security/README
labs.idefense.com/intelligence/vulnerabilities/display.php?id=569
secunia.com/advisories/26219
www-1.ibm.com/support/docview.wss?uid=isg1IZ01121
www-1.ibm.com/support/docview.wss?uid=isg1IZ01122
www.securityfocus.com/bid/25084
www.securitytracker.com/id?1018466
www.vupen.com/english/advisories/2007/2677
exchange.xforce.ibmcloud.com/vulnerabilities/35628