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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

===========================================================================

        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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