IBM Informix Dynamic Server 10.UC3RC1 Trial for Linux and possibly other versions creates /tmp/installserver.txt with insecure permissions, which allows local users to append data to arbitrary files via a symlink attack.

IBM Informix Dynamic Server (IDS) before 9.40.xC7 and 10.00 before 10.00.xC3 allows local users to cause a denial of service (crash) via unspecified vectors.

IBM Informix Dynamic Server (IDS) before 9.40.xC8 and 10.00 before 10.00.xC4 stores passwords in plaintext in shared memory, which allows local users to obtain passwords by reading the memory (product defects 171893, 171894, 173772).

IBM Informix Dynamic Server (IDS) before 9.40.xC3 allows local users to (1) create or overwrite files via the /001 log file to onedcu or (2) read arbitrary files via a symlink attack on a file in /tmp to onshowaudit.