__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN IBM DB2 Buffer Overflow Vulnerabilities [CORE Security Technologies CORE-2003-0531] September 19, 2003 14:00 GMT Number N-154 ______________________________________________________________________________ PROBLEM: IBM's DB2 relational database software, version 7.2, contains two setuid binaries (db2licm and db2dart) which are vulnerable to a buffer overflow. PLATFORM: UNIX and LINUX DAMAGE: Local attackers could escalate privileges, execute arbitrary code, or cause a denial of service. SOLUTION: IBM has released FixPak10a to correct these vulnerabilities. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. A local attacker could gain root ASSESSMENT: privileges. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-154.shtml ORIGINAL BULLETIN: http://www.coresecurity.com/common/showdoc.php? idx=366&idxseccion=10 PATCHES: http://www-3.ibm.com/cgi-bin/db2www/data/db2/udb/winos2unix /support/download.d2w/report ______________________________________________________________________________ [***** Start CORE Security Technologies CORE-2003-0531 *****] Multiple IBM DB2 Stack Overflow Vulnerabilities Core Security Technologies Advisory http://www.coresecurity.com Date Published: 2003-09-18 Last Update: 2003-09-17 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 [***** End CORE Security Technologies CORE-2003-0531 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of CORE Security Technologies for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. 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A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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