IBM Corp.'s DB2 Universal Database product is a large database server product commonly used for high-end databases. For more information, visit the product website at the following URL.
Local exploitation of a buffer overflow vulnerability in the db2dasrrm program, as included with IBM Corp.'s DB2 Universal Database, allows attackers to elevate privileges to root.
This vulnerability exists due to insufficient validation of the length of the attacker-supplied "DASPROF" environment variable contents. By setting the variable to a specially crafted string, an attacker can cause a buffer overflow when the string is copied into a static-sized buffer stored on the stack. By overflowing the buffer, the attacker can overwrite execution control structures stored on the stack and execute arbitrary code.
Exploitation allows local attackers to gain root privileges. In order to exploit this vulnerability, the attacker must have access to execute the vulnerable set-uid root "db2dasrrm" program.
iDefense has confirmed the existence of this vulnerability in IBM Corp.'s DB2 Universal Database 9.1 with Fix Pack 4 installed on a Linux system. Versions for other supported UNIX-like systems should also be considered vulnerable. All previously released versions are suspected vulnerable.
The best defense against this type of vulnerability is to prevent untrusted users from having code execution abilities on the respective database server. The following workarounds may also be useful.
Use a more strict permissions setting for the DB2 instance directory would prevent non-instance users from accessing the set-uid root binaries. Remove the set-uid bit from all programs included with DB2.
These configuration changes have not been tested and may cause adverse behavior.
IBM Corp. has addressed this vulnerability with the release of V9.1 Fix Pack 4a, V8 FixPak 16, and V9.5 Fix Pack 1 of its Universal Database product. More information can be found at the following URLs.
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-5758 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.
11/29/2007 Initial vendor notification
12/01/2007 Initial vendor response
04/09/2008 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
Get paid for vulnerability research
Free tools, research and upcoming events
Copyright © 2008 Verisign, Inc.
Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customer service for permission.
Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.