-----BEGIN PGP SIGNED MESSAGE----- __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN IBM AIX Vulnerability in ptrace() system call August 10, 1999 17:00 GMT Number J-055 ______________________________________________________________________________ PROBLEM: A denial of service vulnerability has been discovered in the ptrace() system call. PLATFORM: AIX versions 4.2.x and 4.3.x. DAMAGE: If exploited, a non-root user could crash the system. SOLUTION: Apply fixes listed below. ______________________________________________________________________________ VULNERABILITY Risk is medium. This vulnerability has been listed on public ASSESSMENT: mailing lists. ______________________________________________________________________________ [ Start IBM Advisory ] ======= ============ ====== ====== ======= ============== ======= ======= === === ==== ====== ====== === =========== ======= ======= === =========== === ======= === === === ==== === ===== === ======= ============== ===== === ===== ======= ============ ===== = ===== EMERGENCY RESPONSE SERVICE SECURITY VULNERABILITY ALERT 26 July 1999 15:00 GMT Number: ERS-SVA-E01-1999:002.1 ============================================================================ VULNERABILITY SUMMARY VULNERABILITY: Non-root users can cause the system to crash PLATFORMS: IBM AIX(r) 4.2.x, 4.3.x SOLUTION: Apply the fixes listed below. ============================================================================ DETAILED INFORMATION I. Description A denial of service vulnerability has been discovered in the ptrace() system call of AIX versions 4.2.x and 4.3.x allowing non-root users to crash the system. This vulnerability has been posted to the bugtraq mailing list. II. Solutions A. Official fix IBM is working on the following fixes which will be available soon. AIX 3.2.x: upgrade to version 4 AIX 4.1.x: not vulnerable AIX 4.2.x: IY02381 AIX 4.3.x: IY02397 B. How to alleviate the problem A temporary fix is available via anonymous ftp from: ftp://aix.software.ibm.com/aix/efixes/security/adb_hang.tar.Z Filename sum md5 ====================================================================== unix_mp.42.adb_hang_fix 00772 2693 960214a1945f2c70311283adc0b231a3 unix_mp.43.adb_hang_fix 15044 3302 584d1c5ea0223110e2d8eba84388f526 This temporary fix has not been fully regression tested. The fix consists of a multiprocessor kernel which can be used on either a uniprocessor or multiprocessor machine. There may be a slight performance penalty when using a multiprocessor kernel on a uniprocessor machine. Use the following steps (as root) to install the temporary fix: 1. Determine the version of the kernel fileset on your machine. # lslpp -l If the version of the kernel fileset for your machine is not at the level described below, install the requisite APAR listed. This will help ensure that the temporary kernel fix will run properly. Release Fileset Version requisite APAR =============================================================== AIX 4.2.x bos.mp or bos.up 4.2.1.23 IY00689 AIX 4.3.x bos.mp or bos.up 4.3.2.8 IY00727 2. Uncompress and extract the fix. # uncompress < adb_hang.tar.Z | tar xf - # cd adb_hang 3. Review and run the adb_hang.sh script to install the new kernel. # view ./adb_hang.sh # ./adb_hang.sh 4. Reboot. III. Obtaining Fixes IBM AIX APARs may be ordered using Electronic Fix Distribution (via the FixDist program), or from the IBM Support Center. For more information on FixDist, and to obtain fixes via the Internet, please reference http://aix.software.ibm.com/aix.us/swfixes/ or send email to "aixserv@austin.ibm.com" with the word "FixDist" in the "Subject:" line. To facilitate ease of ordering all security related APARs for each AIX release, security fixes are periodically bundled into a cumulative APAR. For more information on these cumulative APARs including last update and list of individual fixes, send email to "aixserv@austin.ibm.com" with the word "subscribe Security_APARs" in the "Subject:" line. IV. Contact Information Comments regarding the content of this announcement can be directed to: security-alert@austin.ibm.com To request the PGP public key that can be used to encrypt new AIX security vulnerabilities, send email to security-alert@austin.ibm.com with a subject of "get key". If you would like to subscribe to the AIX security newsletter, send a note to aixserv@austin.ibm.com with a subject of "subscribe Security". To cancel your subscription, use a subject of "unsubscribe Security". To see a list of other available subscriptions, use a subject of "help". IBM and AIX are a registered trademark of International Business Machines Corporation. All other trademarks are property of their respective holders. ============================================================================ IBM's Internet Emergency Response Service (IBM-ERS) is a subscription-based Internet security response service that includes computer security incident response and management, regular electronic verification of your Internet gateway(s), and security vulnerability alerts similar to this one that are tailored to your specific computing environment. By acting as an extension of your own internal security staff, IBM-ERS's team of Internet security experts helps you quickly detect and respond to attacks and exposures across your Internet connection(s). As a part of IBM's Business Recovery Services organization, the IBM Internet Emergency Response Service is a component of IBM's SecureWay(tm) line of security products and services. From hardware to software to consulting, SecureWay solutions can give you the assurance and expertise you need to protect your valuable business resources. To find out more about the IBM Internet Emergency Response Service, send an electronic mail message to ers-sales@ers.ibm.com, or call 1-800-599-9950. IBM-ERS maintains a site on the World Wide Web at http://www.ers.ibm.com/. Visit the site for information about the service, copies of security alerts, team contact information, and other items. IBM-ERS uses Pretty Good Privacy* (PGP*) as the digital signature mechanism For security vulnerability alerts and other distributed information. The IBM-ERS PGP* public key is available from http://www.ers.ibm.com/team-info/pgpkey.html. "Pretty Good Privacy" and "PGP" are trademarks of Philip Zimmermann. IBM-ERS is a Member Team of the Forum of Incident Response and Security Teams (FIRST), a global organization established to foster cooperation and response coordination among computer security teams worldwide. Copyright 1999 International Business Machines Corporation. The information in this document is provided as a service to customers of the IBM Emergency Response Service. Neither International Business Machines Corporation, nor any of its employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, complete- ness, or usefulness of any information, apparatus, product, or process contained herein, or represents that its use would not infringe any 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 IBM or its subsidiaries. The views and opinions of authors expressed herein do not necessarily state or reflect those of IBM or its subsidiaries, and may not be used for advertising or product endorsement purposes. The material in this security alert may be reproduced and distributed, without permission, in whole or in part, by other security incident response teams (both commercial and non-commercial), provided the above copyright is kept intact and due credit is given to IBM-ERS. This security alert may be reproduced and distributed, without permission, in its entirety only, by any person provided such reproduction and/or distribution is performed for non-commercial purposes and with the intent of increasing the awareness of the Internet community. [ End IBM Advisory ] ______________________________________________________________________________ CIAC wishes to acknowledge IBM 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. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@llnl.gov For emergencies and off-hour assistance, DOE, DOE contractor sites, and the NIH may contact CIAC 24-hours a day. During off hours (5PM - 8AM PST), use one of the following methods to contact CIAC: 1. Call the CIAC voice number 925-422-8193 and leave a message, or 2. Call 888-449-8369 to send a Sky Page to the CIAC duty person or 3. Send e-mail to 4498369@skytel.com, or 4. Call 800-201-9288 for the CIAC Project Leader. Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ (or http://ciac.llnl.gov -- they're the same machine) Anonymous FTP: ftp.ciac.org (or ciac.llnl.gov -- they're the same machine) Modem access: +1 (925) 423-4753 (28.8K baud) +1 (925) 423-3331 (28.8K baud) CIAC has several self-subscribing mailing lists for electronic publications: 1. CIAC-BULLETIN for Advisories, highest priority - time critical information and Bulletins, important computer security information; 2. SPI-ANNOUNCE for official news about Security Profile Inspector (SPI) software updates, new features, distribution and availability; 3. SPI-NOTES, for discussion of problems and solutions regarding the use of SPI products. Our mailing lists are managed by a public domain software package called Majordomo, which ignores E-mail header subject lines. To subscribe (add yourself) to one of our mailing lists, send the following request as the E-mail message body, substituting ciac-bulletin, spi-announce OR spi-notes for list-name: E-mail to ciac-listproc@llnl.gov or majordomo@rumpole.llnl.gov: subscribe list-name e.g., subscribe ciac-bulletin You will receive an acknowledgment email immediately with a confirmation that you will need to mail back to the addresses above, as per the instructions in the email. This is a partial protection to make sure you are really the one who asked to be signed up for the list in question. If you include the word 'help' in the body of an email to the above address, it will also send back an information file on how to subscribe/unsubscribe, get past issues of CIAC bulletins via email, etc. PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. 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. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) J-045: Vulnerability in statd exposes vulnerability in automountd J-046: HP-UX VVOS NES Vulnerability J-047: The ExploreZip Worm J-048: Malformed HTR Request Vulnerability J-049: Windows NT, Two Denial-of-Service Vulnerabilities J-050: HP-UX Visualize Conference Vulnerability J-051: Calendar Manager Service Buffer Overflow Vulnerability J-052: SGI arrayd default security configuration J-053: HP Current Directory Vulnerability J-054: Unauthorized Access to IIS Servers through ODBC Data Access with RDS -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBN7G7frnzJzdsy3QZAQG7PgP+KM+7KXIvemuKUU6aFraKFDGMT2iPjo/p +IMkx/kPhbjSGi9siluooHQrOmQS+IaHM+NrKLJv3pcvJIY8ht9PyqmtqObZyuNu FtJZp66FC5R+rXL35bL5LM6CXJepLrJ239dRFm9HcrHoc8PKHb1Ygiu/ylv9rUdm 5bedWLjE8so= =JGnb -----END PGP SIGNATURE-----