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AUSCERT External Security Bulletin Redistribution
ESB-2008.0130 -- [Win][Linux][HP-UX][Solaris][AIX]
IBM DB2 Universal Database - Two Vulnerabilities
13 February 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM DB2 Universal Database Administration Server
IBM DB2 Universal Database db2pd
Publisher: iDEFENSE
Operating System: Windows
Linux variants
AIX
HP-UX
Solaris
Impact: Execute Arbitrary Code/Commands
Root Compromise
Access: Remote/Unauthenticated
Existing Account
CVE Names: CVE-2007-5757 CVE-2007-3676 CVE-2008-0696
CVE-2008-0697 CVE-2008-0698 CVE-2008-0699
Original Bulletin:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=653
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=654
Comment: This bulletin contains two (2) iDefense Vulnerability Advisories
Only the Linux and Unix versions are vulnerable to the authenticated
root compromise vulnerability.
Revision History: February 13 2008: Added CVEs
February 8 2008: Initial Release
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IBM DB2 Universal Database Administration Server Memory Corruption
Vulnerability
I. BACKGROUND
IBM Corp.'s DB2 Universal Database product is a large database server
product commonly used for high end databases. The DB2 Administration
Server (DAS) provides functionality that implements the Java-based DB2
Control Center GUI. For more information, visit IBM's DB2 product site
at the following URL.
http://ibm.com/db2/
II. DESCRIPTION
Remote exploitation of a memory corruption vulnerability within
version 9.1 of IBM Corp.'s DB2 Universal Database Administration
Server (DAS) allows attackers to crash the service or potentially
execute arbitrary code in the context of the affected service.
When handling certain remote administration requests, the
Administration Server uses a 32-bit pointer value supplied by the
remote client. By supplying carefully chosen address values, an
attacker can cause memory corruption or force the program to access
invalid memory locations.
III. ANALYSIS
Exploitation allows attackers to crash the service or execute
arbitrary code within the context of the affected service. No
authentication credentials are required. The attacker only needs the
ability to establish a TCP session with the DAS on TCP port 523.
By default this service runs as "dasusr1" on Linux and "db2admin" on
Windows. In the Linux version of the DAS, the process is monitored by
a fault monitoring process and will restart automatically after a few
seconds. This monitoring process does not exist in the Windows
version.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in the DAS
(db2dassrm) as included with DB2 9.1 with Fix Pack 2 for both Linux
and Windows platforms. Previous versions, as well as builds for other
platforms, are suspected to be vulnerable.
V. WORKAROUND
Employing firewalls to limit access to the affected service will
mitigate exposure to this vulnerability.
VI. VENDOR RESPONSE
IBM Corp. has addressed these vulnerabilities by releasing V9 Fix Pack
4 and V8 FixPak 16 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-2007-3676 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
06/18/2007 Initial vendor notification
06/20/2007 Initial vendor response
08/14/2007 V8 Fix Pack 15 made available
08/15/2007 V9 Fix Pack 3 made available
10/10/2007 V9 Fix Pack 3a made available
11/13/2007 V9 Fix Pack 4 made available
01/28/2008 V8 Fix Pack 16 made available
02/05/2008 V8 Fix Pack 16 fix list made available
02/07/2008 Public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright 2008 iDefense, 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.
IBM DB2 Universal Database db2pd Arbitrary Library Loading
Vulnerability
I. 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 following URL.
http://ibm.com/db2/
II. DESCRIPTION
Local exploitation of a library loading vulnerability in IBM Corp.'s
DB2 Universal Database could allow attackers to gain root privileges.
When the DB2INSTANCE environment variable is set, the libdb2 library
will use the corresponding user's directory in place of the DB2
instance directory. This allows an unprivileged local user to control
the directory structure on which several set-uid root binaries
operate.
This vulnerability exists due to the way the db2pd binary loads a
library. The program will construct the path to a library to be loaded
by concatenating the path to the instance directory with the static
string "/sqllib/lib/libdb2fmtdmp.so". When an attacker sets the
DB2INSTANCE environment variable to their user name, the binary will
load the library from their directory.
III. ANALYSIS
Exploitation allows local attackers to gain root privileges. In order
to exploit this vulnerability, an attacker must be able to execute the
set-uid root db2pd binary.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in IBM
Corp.'s DB2 Universal Database 9.1 with FixPack 2 installed on a Linux
system. Other versions, including those for other UNIX systems, are
also suspected to be vulnerable.
V. WORKAROUND
In order to mitigate exposure to this vulnerability, implement one of
the following workarounds.
Using strict permissions for the DB2 instance directory will prevent non-inst
ance users from accessing the set-uid root binaries.
Remove the set-uid bit from the db2pd binary.
VI. VENDOR RESPONSE
IBM Corp. has addressed these vulnerabilities by releasing V9 Fix Pack
4 and version V8 FixPak 16 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-2007-5757 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
11/13/2007 V9 Fix Pack 4 made available
01/28/2008 V8 Fix Pack 16 made available
02/05/2008 V8 Fix list made available
02/07/2008 Public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright 2008 iDefense, 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.
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