Untrusted execution path vulnerability in chcod on AIX IBM 5.1.0, 5.2.0, and 5.3.0 allows local users to execute arbitrary programs by modifying the PATH environment variable to point to a malicious "grep" program, which is executed from chcod.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18625
http://www.idefense.com/application/poi/display?id=170&type=vulnerabilities
http://www-1.ibm.com/support/search.wss?rs=0&q=IY64356&apar=only
http://www-1.ibm.com/support/search.wss?rs=0&q=IY64355&apar=only
http://www-1.ibm.com/support/search.wss?rs=0&q=IY64354&apar=only