Title: Informix SQL ONSRVAPD Predictable Temporary File Creation Vulnerability
Severity: HIGH
Description:
Informix is an enterprise database distributed and maintained by IBM.
A problem in the Informix SQL package makes it possible for a local user to overwrite root-owned files, and potentially gain elevated privileges.
The problem is in the onsrvapd program. Upon execution, the program creates the predictable files onsrvapd.log (owned and group member informix), and onsnmp.$HOSTNAME.log (owned by root, group member informix) in the /tmp directory, where $HOSTNAME is the name of Informix SQL host. The log files are created with world-writable permissions.
Since the onsrvapd program is setuid root, this makes it possible for a user to create a symbolic link in place of the onsnmp.$HOSTNAME.log file, and point the symbolic link to any file, existing or non-existing.
In the case of an existing file, this allows the attacker to overwrite the file, leaving the file with permissions of 0666. If the file does not exist, a file will be created at the end of the symbolic link with permissions 0666.
This problem could result in a local user denying service to legitimate users of the system, or potentially gaining local root access.
Affected Products:
- IBM Informix SQL 7.31.0.UC5
- IBM Informix SQL 9.2.00.UC2
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