CORE-2003-0531: Multiple IBM DB2 Stack Overflow Vulnerabilities

                    Core Security Technologies Advisory
                        http://www.coresecurity.com

              Multiple IBM DB2 Stack Overflow Vulnerabilities

Date Published: 2003-09-18

Last Update: 2003-09-18

Advisory ID: CORE-2003-0531

Bugtraq ID: 8552, 8553

CVE Name: CAN-2003-0758, CAN-2003-0759

Title: Multiple IBM DB2 Stack Overflow Vulnerabilities

Class: Boundary Error Condition (Buffer Overflow)

Remotely Exploitable: No

Locally Exploitable: Yes

Advisory URL:
http://www.coresecurity.com/common/showdoc.php?idx=366&idxseccion=10

Vendors contacted:

• IBM:
  . Core Notification: 2003-08-15
  . Notification acknowledged by IBM: 2003-08-18
  . Fixes available for [CAN-2003-0758]: 2003-08-31
  . Fixes available for [CAN-2003-0759]: 2003-09-17

Release Mode: COORDINATED RELEASE

Vulnerability Description:

DB2 is IBM's relational database software, oriented toward the
deployment and development of e-business, business intelligence,
content management, enterprise resource planning and customer
relationship management solutions. DB2 can be deployed in
AIX, HP-UX, Linux, Solaris and Windows environments.

IBM's DB2 database ships with two vulnerable setuid binaries, namely
db2licm and db2dart. Both binaries are vulnerable to a buffer overflow
that allows a local attacker to execute arbitrary code on the
vulnerable machine with privileges of the root user. The vulnerability
is triggered providing a long command line argument to the binaries.

By default (in the environment available during research), the
vulnerable binaries have the following privileges (for example in the
case of db2licm):

-r-sr-x— 1 root db2iadm1 31926 Jun 21 2002 /home/db2inst1/sqllib/adm/db2licm
-r-sr-x— 1 root db2asgrp 31926 Jun 21 2002 /home/db2as/sqllib/adm/db2licm

The db2as is the only user of the db2iadm1 group, and db2inst1 is the
only user of the db2asgrp group. So, in a default install, an attacker
with access to the system with any those accounts, will be able to
escalate privileges to the root account.

Vulnerable Packages:

IBM DB2 Universal Data Base v7.2 for Linux/x86 is vulnerable.
IBM DB2 Universal Data Base v7.2 for Linux/s390 is vulnerable.

Other IBM DB2 versions and target platforms were not available for
testing, but may be vulnerable as well.

Solution/Vendor Information/Workaround:

[BID 8552, CAN-2003-0758]
The db2dart issue is fixed in Fixpak 10 for DB2 v7.2.

Fixpak 10 is available at:
http://www-3.ibm.com/cgi-bin/db2www/data/db2/udb/winos2unix/support/download.d2w/report

[BID 8553, CAN-2003-0759]
The db2licm issue is fixed in Fixpak 10a for DB2 v7.2.

Fixpak 10a will soon be available at:
http://www-3.ibm.com/cgi-bin/db2www/data/db2/udb/winos2unix/support/v7fphist.d2w/report

If Fixpak 10a is not already available in this webpage, you
can download it from IBM's FTP site. For example the 32-bit Intel
Linux version of fixpack 10a is located at:
ftp://ftp.software.ibm.com/ps/products/db2/fixes/english-us/db2linuxv7/FP10a_U495179

Credits:

This vulnerability was found by Juan Pablo Martinez Kuhn from
Core Security Technologies.
We wish to thank Juan Manuel Pascual Escriba for his cooperation
testing and confirming the vulnerabilities. We also wish to thank
Scott Logan from IBM for his quick response to this issue.

Technical Description - Exploit/Concept Code:

The following tests are enough to confirm a binary is vulnerable.
Executing these perl scripts should produce a segmentation fault
in vulnerable binaries:

[BID 8552, CAN-2003-0758]

/home/db2as/sqllib/adm/db2dart `perl -e 'print "A"x1287'`

Segmentation fault

[BID 8553, CAN-2003-0759]

/home/db2as/sqllib/adm/db2licm `perl -e 'print "A"x999'`
…
User Response: Enter the name of a file that exists and can be
opened and try the command again.

Segmentation fault
…

Both binaries suffer from a simple stack based buffer overflow.
Exploitation of the vulnerabilities is trivial. To confirm the
exploitability, sample exploit code was developed for DB2 7.1 binaries
for the Linux operating system running on x86 and s390 systems.

About Core Security Technologies

Core Security Technologies develops strategic security solutions for
Fortune 1000 corporations, government agencies and military
organizations. The company offers information security software and
services designed to assess risk and protect and manage information
assets.
Headquartered in Boston, MA, Core Security Technologies can be reached
at 617-399-6980 or on the Web at http://www.coresecurity.com.

To learn more about CORE IMPACT, the first comprehensive penetration
testing framework, visit:
http://www.coresecurity.com/products/coreimpact

DISCLAIMER:

The contents of this advisory are copyright (c) 2003 CORE Security
Technologies and may be distributed freely provided that no fee is
charged for this distribution and proper credit is given.

$Id: db2-advisory.txt,v 1.4 2003/09/18 11:05:35 carlos Exp $