IBM DB2 Universal Database Directory Creation Vulnerability
iDefense Security Advisory 08.16.07 http://labs.idefense.com/intelligence/vulnerabilities/ Aug 16, 2007
IBM Corp.'s DB2 Universal Database product is a large database server product commonly used for high end databases. For more information, visit the following URL.
Local exploitation of a directory creation vulnerability in IBM Corp.'s DB2 Universal Database could allow attackers to elevate privileges to the superuser.
This vulnerability exists due to insecure directory creation within setuid-binaries included with DB2. While creating specific directory structures, attacker created symbolic links will be followed. This allows world-writable directories to be created anywhere on the file system.
Exploitation allows local attackers to gain root privileges.
In order to execute arbitrary code, an attacker could create a world-writable locale directory. By creating a specially crafted localized message file, the attacker can cause a format string of their choosing to be passed to a function in the printf(3) family. Using known format string exploitation techniques, an attacker can then execute arbitrary code as root. This should not be considered the only way to gain root privileges with this vulnerability. However, iDefense has confirmed this method in lab tests.
iDefense confirmed the existence of this vulnerability in version 9.1 Fix Pack 2 of IBM Corp.'s DB2 Universal Database installed on a Linux system. All prior versions, as well as builds for other UNIX-based operating systems, are suspected to be vulnerable.
Setting more strict permissions on the DB2 instance directory can help mitigate some of these vulnerabilities. Removing the setuid-bit from all programs included with DB2 can also help mitigate exposure. Note, these configuration changes have not been thoroughly tested and may cause adverse behavior.
VI. VENDOR RESPONSE
IBM Corp. has addressed this vulnerability by releasing V9 Fix Pack 3 and version V8 FixPak 15 of its Universal Database product. More information can be found at the following URLs.
V8: http://www-1.ibm.com/support/docview.wss?uid=swg21256235 V9: http://www-1.ibm.com/support/docview.wss?uid=swg21255572
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-4273 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.
VIII. DISCLOSURE TIMELINE
03/22/2007 Initial vendor notification 03/23/2007 Initial vendor response 08/16/2007 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
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