Title: Informix SQL SNMPDM Predictable Temporary File Creation Vulnerability
Severity: HIGH
Description:
Informix is an enterprise level database maintained and distributed by IBM.
A problem with the Informix SQL database add-on package makes it possible for a local user to exploit a symbolic link problem. This problem is in the snmpdm package.
Upon execution of the setuid root application snmpdm, a file is created in the /tmp directory using filename snmpd.log. This file is created with world-writable permissions.
Since the snmpdm program is setuid root, this makes it possible for a user to create a symbolic link in place of the snmpd.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
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