Format string vulnerability in IBM Informix Dynamic Server (IDS) before 9.40.xC3 allows local users to execute arbitrary code via a modified INFORMIXDIR environment variable that points to a file with format string specifiers in the filename.
https://exchange.xforce.ibmcloud.com/vulnerabilities/14967
http://www.securityfocus.com/bid/9511
http://www-1.ibm.com/support/docview.wss?uid=swg21153336