Public Vulnerability Reports

IBM DB2 Universal Database db2dasStartStopFMDaemon Buffer Overflow Vulnerability

15.04.08

BACKGROUND

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.

http://ibm.com/db2/

DESCRIPTION

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.

ANALYSIS

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.

DETECTION

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.

WORKAROUND

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.

VENDOR RESPONSE

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.

V8: http://www-1.ibm.com/support/docview.wss?uid=swg21256235

V9.1: http://www-1.ibm.com/support/docview.wss?uid=swg21255572

V9.5: http://www-1.ibm.com/support/docview.wss?uid=swg21287889

CVE INFORMATION

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.

DISCLOSURE TIMELINE

11/29/2007 Initial vendor notification
12/01/2007 Initial vendor response
04/09/2008 Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2008 Verisign, Inc.

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