Untrusted search path vulnerability in acctctl in IBM AIX 5.3.0 allows local users to execute arbitrary commands by modifying the path to point to a malicious mkdir program.
https://exchange.xforce.ibmcloud.com/vulnerabilities/29163
http://www.vupen.com/english/advisories/2006/3871
http://www.vupen.com/english/advisories/2006/3770
http://www-1.ibm.com/support/docview.wss?uid=isg1IY88681