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TUCoPS :: Unix :: Various Flavours :: ciaci022.txt

IBM AIX Routed Daemon Vulnerability




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             __________________________________________________________

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

                             INFORMATION BULLETIN

                     IBM AIX "routed" daemon Vulnerability

January 8, 1998 22:00 GMT                                         Number I-022
______________________________________________________________________________
PROBLEM:       A vulnerability exists in "routed" daemon that allows accep-
               tance of packets that cause arbitrary system files to be
               created and/or modified.
PLATFORM:      Only machines running the routed daemon are vulnerable.
               IBM AIX(r) 3.2.x, 4.1.x, 4.2.x, 4.3.x
DAMAGE:        By exploiting this vulnerability, remote users may gain access
               to the system.
SOLUTION:      A temporary fix is available from IBM.  Contact information is
               listed in Section III.
______________________________________________________________________________
VULNERABILITY  An exploit script has been made publicly available.
ASSESSMENT:                                                                  
______________________________________________________________________________

[ Start IBM Advisory ]

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                           EMERGENCY RESPONSE SERVICE
                          SECURITY VULNERABILITY ALERT

08 January 1998 20:30 GMT                        Number: ERS-SVA-E01-
1998:001.1
==============================================================================
                             VULNERABILITY  SUMMARY

VULNERABILITY:    The "routed" daemon allows remote users to modify system
                  files.

PLATFORMS:        IBM AIX(r) 3.2.x, 4.1.x, 4.2.x, 4.3.x

SOLUTION:         Apply the fixes listed below.

THREAT:           Remote users can gain system access.

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

I.  Description

The "routed" daemon accepts packets that cause arbitrary system files to be
created and/or modified.  Only machines running the routed daemon are
vulnerable.

An exploit script has been made publicly available.

II.  Impact

Remote users can modify system files which can allow remote access to the
system.

III.  Solutions

  A.  How to alleviate the problem

      A temporary fix is available via anonymous ftp from:

        ftp://testcase.software.ibm.com/aix/fromibm/security.routed.tar.Z

      Filename      sum               md5
      =================================================================
      routed        59682    40       1aae6cf116ae84f8bee91b96736b7d23

      Use the following steps (as root) to install the temporary fix:

      1.  Uncompress and extract the fix:

        # uncompress < security.routed.tar.Z | tar xf -

      2.  Execute the following commands to replace the vulnerable routed
          binary:

        # cp /usr/sbin/routed /usr/sbin/routed.orig
        # chmod -x /usr/sbin/routed.orig
        # cp routed/routed /usr/sbin/routed
        # chmod 554 /usr/sbin/routed

      NOTE: This temporary fix has not been fully regression tested.

  B.  Official fix

      IBM is currently working on the following APARs but they are not yet
      available.

         AIX 4.3.x:  IX73951
         AIX 4.2.x:  IX73949
         AIX 4.1.x:  IX73948
         AIX 3.2.x:  upgrade to version 4

IV. 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://service.software.ibm.com/aixsupport/

or send electronic mail to "aixserv@austin.ibm.com" with the word "FixDist" in
the "Subject:" line.

V.  Acknowledgements

Thanks to www.rootshell.com for bringing this problem to our attention.

VI.  Contact Information

Comments regarding the content of this announcement can be directed to the IBM
Support Center or 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@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 1998 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 Advisory ]
______________________________________________________________________________

CIAC wishes to acknowledge the contributions of IBM Corporation 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
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                        +1 (510) 423-3331 (28.8K baud)

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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.

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