HCL Informix directory security

utilities and product directories are secure by default.

The database server utilities check security before and after the database server starts. See Utilities for checking directory security (UNIX).
The directory permissions of the installation path and key subdirectories must meet security requirements to prevent attacks on Informix® programs. See Installation path security requirements (UNIX).
The onsecurity utility checks the security of the directories of the installation path. When you run this utility manually or when you install Informix Version 11.50.xC4 (or later version), you are notified of potentially dangerous directory permissions and how to correct the problems. See The onsecurity utility (UNIX).
You cannot continue to use many programs with the database server if a security problem in $INFORMIXDIR or its subdirectories arises. See Securing $INFORMIXDIR and its subdirectories
Most Informix utilities run as secure users and belong to a secure group. See Users and group membership for running utilities
The chunk files that hold the data for Informix must be secure also. See Security of the chunk files.
Use the DB_LIBRARY_PATH configuration parameter to control the location from which shared objects, such as external modules, can be loaded. See Security for loading external modules.