IBM DB2 Universal Database buildDasPaths Buffer Overflow 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 buffer overflow vulnerability in IBM Corp.'s DB2 Universal Database could allow attackers to elevate privileges to the superuser.
This vulnerability specifically exists due to insufficient validation of the length of attacker supplied data. When an attacker specifies a specially crafted string via certain environment variables, the string is copied into a static sized buffer stored on the stack. By supplying too much data, an attacker can overflow the buffer and overwrite stack-stored execution control structures resulting in arbitrary code execution.
Exploitation allows local attackers to gain root privileges.
Non-executable memory technology such as PaX, DEP, exec-shield, or other NX or XD technology, can help prevent against exploitation of this type vulnerability.
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-2007-4276 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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