IBM Informix Dynamic Server 10.00, Informix Client Software Development Kit (CSDK) 2.90, and Informix I-Connect 2.90 use insecure permissions for installation scripts, which allows local users to gain privileges by modifying the scripts.
http://www.vupen.com/english/advisories/2006/4280
http://www-1.ibm.com/support/docview.wss?uid=swg21247438