Published:
28 October 1997
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-97.138 -- IBM-ERS Security Vulnerability Alert Buffer overflows in the libDtSvc.a library 29 October 1997 =========================================================================== The IBM Emergency Response Service has released the following advisory concerning some vulnerabilities in the libDtSvc.a library under IBM AIX(r) 4.1, 4.2. This vulnerability may allow local users to gain root access. Exploit information for this vulnerability has been made publically available. The following security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write this document, AUSCERT has had no control over its content. As such, the decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. Contact information for IBM ERS is included in the Security Bulletin below. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/information/advisories.html If you believe that your system has been compromised, contact AUSCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 4477 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AUSCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. - --------------------------BEGIN INCLUDED TEXT-------------------- - --- FOR PUBLIC RELEASE --- - -----BEGIN PGP SIGNED MESSAGE----- - - --ERS-ALERT--ERS-ALERT--ERS-ALERT--ERS-ALERT--ERS-ALERT--ERS-ALERT--ERS-ALERT-- - - ---EXTERNAL RELEASE---EXTERNAL RELEASE---EXTERNAL RELEASE---EXTERNAL RELEASE--- ======= ============ ====== ====== ======= ============== ======= ======= === === ==== ====== ====== === =========== ======= ======= === =========== === ======= === === === ==== === ===== === ======= ============== ===== === ===== ======= ============ ===== = ===== EMERGENCY RESPONSE SERVICE SECURITY VULNERABILITY ALERT 28 October 1997 20:30 GMT Number: ERS-SVA-E01-1997:005.1 =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: Buffer overflows in the libDtSvc.a library PLATFORMS: IBM AIX(r) 4.1, 4.2 SOLUTION: Apply the fixes listed below THREAT: Local users can become root =========================================================================== DETAILED INFORMATION I. Description A buffer overflow vulnerability exists in the AIX libDtSvc.a library that can allow local users to become root. There has been an exploit posted to the Bugtraq mailing list. In the course of investigating the libDtSvc.a overflows, fixes were made to the writesrv and rcp commands as well. II. Fixes Abstract 4.1 APAR 4.2 APAR ==================================================================== SECURITY: buffer overflow in dtaction IX69179 IX69180 SECURITY: buffer overflow in writesrv IX69168 IX69169 SECURITY: buffer overflow in /bin/rcp IX69170 IX69171 To determine if you have these APARs on your system, run the following command (double quotes required if more than one APAR is specified): instfix -ivk "<APARid> [<APARid> ...]" Or run the following command (no double quotes): lslpp -h <fileset> [<fileset> ...] Each installed fileset listed in the tables below must be at the indicated version or higher. AIX 4.1 ------- Fileset Version ================================================ X11.Dt.rte 4.1.5.13 X11.Dt.helprun 4.1.5.2 bos.rte.im 4.1.4.2 X11.base.lib 4.1.5.6 X11.Dt.lib 4.1.5.5 X11.motif.lib 4.1.5.4 X11.samples.lib.Core 4.1.5.2 bos.rte.misc_cmds 4.1.5.3 bos.rte.tcp.client 4.1.5.11 AIX 4.2 ------- Fileset Version ================================================ X11.Dt.rte 4.2.1.5 X11.Dt.helprun 4.2.1.1 bos.rte.im 4.2.1.1 X11.vsm.rte 4.2.1.3 X11.motif.lib 4.2.1.2 X11.samples.lib.Core 4.2.0.1 bos.rte.misc_cmds 4.2.1.1 bos.net.tcp.client 4.2.1.10 To Order ======== APARs may be ordered using Electronic Fix Distribution (via FixDist) or from the IBM Support Center. For more information on FixDist, reference URL: http://service.software.ibm.com/aixsupport/ or send e-mail to aixserv@austin.ibm.com with a subject of "FixDist". III. Contact Information 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 registered trademarks of International Business Machines Corporation. =============================================================================== 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@vnet.ibm.com, or call 1-800-742-2493 (Prompt 4). 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 1997 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, Integrated Systems Solutions Corporation, 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 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. - - ---EXTERNAL RELEASE---EXTERNAL RELEASE---EXTERNAL RELEASE---EXTERNAL RELEASE--- - - --ERS-ALERT--ERS-ALERT--ERS-ALERT--ERS-ALERT--ERS-ALERT--ERS-ALERT--ERS-ALERT-- - -----BEGIN PGP SIGNATURE----- Version: 2.7.1 iQCVAwUBNFZOXfWDLGpfj4rlAQF5sAP9E+Sgt6QDUAO5NDXLGLs0XPtxxW7MQDag Z3Qfi03xfllR3Uv4sU7zaYTELKnO7z2btF+/+REDHBxQh92Jr6qAGivys0n89EI/ Yn6P5ZAOyta4hv++G22y6KOdZPG0jYbRSPt/8Ukn9s6QM9+xx7/854rBERCzL3eF JqN3pf8WEPk= =x2tZ - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBNFcI5ih9+71yA2DNAQHNAwQAijw6Z/QpIuGkU880uJqYHx+pCyZxhBmy Vsb3C7GpCAfQn5fYuQmxQ0CfL8aRB12Qhs/auYiOX1cijpCbtElpHYqi4VyjjlZe +vVVu5IrAFs4gGGjTOOugo+PioMl3D6dkDlyK/x8O54bdwwm/9QxmIlsVD77yFnP 2EF6dJY57Vw= =sjcQ -----END PGP SIGNATURE-----