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TUCoPS :: Unix :: Various Flavours :: ciaci010.txt

IBM AIX Libdtsvc A Piodmgrsu Nslookup




-----BEGIN PGP SIGNED MESSAGE-----

             __________________________________________________________

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

                IBM AIX Vulnerabilities (libDtSvc.a, piodmgrsu, nslookup)

October 28, 1997 22:00 GMT                                        Number I-010
______________________________________________________________________________
PROBLEM:       IBM has identified three vulnerabilities;
                 1) A buffer overflow in the AIX libDtSvc.a library
                 2) The AIX piodmgrsu command incorrectly uses privilege
                 3) The AIX "nslookup" command does not drop privileges
                    correctly
PLATFORM:      IBM AIX(r) 4.1, 4.2
DAMAGE:        1 and 3) Local users may become root.
               2) Local users may gain additional privileges.
SOLUTION:      Apply the fixes listed below
______________________________________________________________________________
VULNERABILITY  The information on this vulnerability should be acted upon as
ASSESSMENT:    soon as possible to avoid possible unauthorized access.
______________________________________________________________________________

[ Start IBM Advisories ]


1)  Buffer overflow in the AIX libDtSvc.a library

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                           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.


2)  The AIX piodmgrsu command

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

                           EMERGENCY RESPONSE SERVICE
                          SECURITY VULNERABILITY ALERT

29 October 1997 19:00 GMT                       Number: ERS-SVA-E01-1997:007.1
==============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:    The AIX piodmgrsu command incorrectly uses privilege

PLATFORMS:        IBM AIX(r) 4.1, 4.2

SOLUTION:         Apply the fixes listed below

THREAT:           Local users can gain additional privileges

==============================================================================
                           DETAILED INFORMATION

I.  Description

The piodmgrsu command was first shipped in AIX 4.1 and performs various
operations on the printer backend's alternate ODM database.  The command
passes an insecure environment to its children allowing local users to gain
access to the administrative "printq" group.

II.  Fixes

  AIX 4.1
  -------
    Apply the following fix to your system:

        APAR - IX71514

    To determine if you have this APAR on your system, run the following
    command:

       instfix -ik IX71514

    Or run the following command:
   
       lslpp -h printers.rte

    Your version of printers.rte should be 4.1.5.4 or later.

  AIX 4.2
  -------
    Apply the following fix to your system:

        APAR - IX71517

    To determine if you have this APAR on your system, run the following
    command:

       instfix -ik IX71517

    Or run the following command:
   
       lslpp -h printers.rte

    Your version of printers.rte should be 4.2.1.2 or later.

  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".

IV.  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 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@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.


3)  The AIX "nslookup" command

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

                           EMERGENCY RESPONSE SERVICE
                          SECURITY VULNERABILITY ALERT

29 October 1997 19:00 GMT                       Number: ERS-SVA-E01-1997:008.1
==============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:    The AIX "nslookup" command does not drop privileges
correctly

PLATFORMS:        IBM AIX(r) 4.1, 4.2

SOLUTION:         Apply the fixes listed below

THREAT:           Local users can become root

==============================================================================
                           DETAILED INFORMATION

I.  Description

The nslookup command has a vulnerability that allows local users to become
root.

II.  Solutions

  A.  How to alleviate the problem

      This problem can be alleviated by removing the set-user-id bit from the
      "nslookup" program.  To do this, execute the following command as
"root":

          chmod 555 /usr/bin/nslookup

      Removing the set-user-id bit will not result in lost functionality
unless
      /etc/resolv.conf exists and is not world-readable.

  B.  Official fix

      AIX 4.1
      -------
      Apply the following fix to your system:

        APAR - IX71464

      To determine if you have this APAR on your system, run the following
      command:

        instfix -ik IX71464

      Or run the following command:
   
        lslpp -h bos.net.tcp.client

      Your version of bos.net.tcp.client should be 4.1.5.14 or later.

      AIX 4.2
      -------
      Apply the following fix to your system:

        APAR - IX70815

      To determine if you have this APAR on your system, run the following
      command:

        instfix -ik IX70815

      Or run the following command:
   
        lslpp -h bos.net.tcp.client

      Your version of bos.net.tcp.client should be 4.2.1.10 or later.

      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 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@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.


[ End IBM Advisories ]

______________________________________________________________________________

CIAC wishes to acknowledge the contributions of 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:    +1 510-422-8193
    FAX:      +1 510-423-8002
    STU-III:  +1 510-423-2604
    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), call the CIAC voice number 510-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is 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://ciac.llnl.gov/
   Anonymous FTP:       ciac.llnl.gov (198.128.39.53)
   Modem access:        +1 (510) 423-4753 (28.8K baud)
                        +1 (510) 423-3331 (28.8K baud)

CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
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Our mailing lists are managed by a public domain software package
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subscribe (add yourself) to one of our mailing lists, send the
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  e.g., subscribe ciac-bulletin

You will receive an acknowledgment email immediately with a confirmation
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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
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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)

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