iDefense Security Advisory 02.22.07 - Local exploitation of a file creation vulnerability in IBM Corp.'s DB2 Universal Database could allow attackers to elevate privileges to the superuser. This vulnerability exists due to unsafe file access from within several setuid-root binaries. Specifically, when supplying the DB2INSTANCE environment variable, the setuid-root DB2 administration binaries will use the home directory of the specified user for loading configuration data. This allows attackers create or append to arbitrary files by creating a specific executing environment. Additionally, the user's umask settings will be honored allowing the creation of root-owned world-writable files. iDefense has confirmed the existence of this vulnerability within IBM Corp.'s DB2 Universal Database 9.1 release installed on Linux. Other versions are suspected to be vulnerable as well. This vulnerability does not affect DB2 Universal Database running on the windows platform.
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