Untrusted search path vulnerability in snappd in IBM AIX 5.2.0 and 5.3.0 allows local users to execute arbitrary commands via a Trojan horse program, involving the "system subroutine".
https://exchange.xforce.ibmcloud.com/vulnerabilities/29157
http://www.vupen.com/english/advisories/2006/3770
http://www.securityfocus.com/bid/20193
http://www-1.ibm.com/support/docview.wss?uid=isg1IY88820
http://www-1.ibm.com/support/docview.wss?uid=isg1IY88818