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.

The installation script in IBM Informix Dynamic Server 10.00, Informix Client Software Development Kit (CSDK) 2.90, and Informix I-Connect 2.90 allows local users to "compromise security" via a symlink attack on temporary files.