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ESB-2007.0569 -- [AIX] -- AIX arp Buffer Overflow Vulnerability

Date: 27 July 2007

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0569 -- [AIX]
                   AIX arp Buffer Overflow Vulnerability
                               27 July 2007

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

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              arp(1)
Publisher:            IBM
Operating System:     AIX 5.2, 5.3
Impact:               Root Compromise
Access:               Existing Account

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IBM SECURITY ADVISORY

First Issued: Tue Jul 24 14:07:25 CDT 2007
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX arp Buffer Overflow Vulnerability

PLATFORMS:       AIX 5.2, 5.3

SOLUTION:        Apply the APAR, interim fix or workaround as described
                 below.

THREAT:          An attacker may run arbitrary code with root privileges.

CERT VU Number:  n/a
CVE Number:      n/a
===============================================================================
                           DETAILED INFORMATION

I. OVERVIEW

    The arp command displays and modifies the Internet-to-adapter address
    translation tables used by the Address in Networks and communication
    management.  This program is installed as setuid with the
    devices.common.IBM.atm.rte fileset.

    NOTE: IBM has removed support for ATM functionality.  This advisory is
    only to notify users that their system is vulnerable and to provide a patch
    for releases which are still delivering the fileset for legacy purposes.

II. DESCRIPTION

    A buffer overflow vulnerability exits within the setuid program arp.  This
    advisory specifically addresses the atm subset of the arp command.

III. IMPACT

    A successful exploitation of this buffer overflow will allow an
    unprivileged user to execute arbitrary code with root privileges.

IV. PLATFORM VULNERABILITY ASSESSMENT

    To determine if your system is vulnerable, run the following command:

    # lslpp -l | grep devices.common.IBM.atm.rte

    The following filesets are vulnerable:

    AIX Level           Lower Level       Upper Level
    -------------------------------------------------
    5.2.0               5.2.0.51          5.2.0.95
    5.3.0               5.3.0.40          5.3.0.60

V. SOLUTIONS

    A. APARS

        IBM provides the following fixes:

        AIX Level           APAR number       Availability
        --------------------------------------------------------------------
        5.2.0               IZ00521           10/31/2007 (subject to change)
        5.3.0               IZ00510           08/08/2007 (subject to change)

        AIX Version 5 APARs can be downloaded from:

        http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html

        NOTE: Affected customers are urged to upgrade to the latest applicable
        Technology Level and Service Pack.

    B. INTERIM FIXES

        Interim fixes are available.  The interim fix can be downloaded via
        ftp from:

        ftp://aix.software.ibm.com/aix/efixes/security/atm_ifix.tar.Z

        This is a compressed tarball containing this advisory, interim fix
        packages and PGP signatures for each package.  The interim fixes below
        include prerequisite checking. This will enforce the correct mapping
        between the fixes and AIX Technology Levels.

        AIX Release & Technology Level         Interim fix
        ---------------------------------------------------------------
        5200-08                                IZ00521_08.070622.epkg.Z
        5200-09                                IZ00521_09.070622.epkg.Z
        5200-10                                IZ00521_10.070622.epkg.Z
        5300-04                                IZ00510_04.070622.epkg.Z
        5300-05                                IZ00510_05.070622.epkg.Z
        5300-06                                IZ00510_06.070622.epkg.Z

        IMPORTANT: If possible, it is recommended that a mksysb backup of the
        system be created.  Verify it is both bootable and readable before
        proceeding.

        These interim fixes have not been fully regression tested; thus, IBM
        does not warrant the fully correct functionality of the interim fix.
        Customers install the interim fix and operate the modified version of
        AIX at their own risk.

        Verify you have retrieved the fixes intact:

        The interim fixes below are named by using the technology level
        corresponding to the release that the fix applies to. The checksums
        below were generated using the "sum" and "md5sum" commands and are as
        follows:

        Filename                   sum        md5sum
        ----------------------------------------------------------------------
        IZ00521_08.070622.epkg.Z   19355 11   888d9ff0634cd3833c7b84adda724ef2
        IZ00521_09.070622.epkg.Z   22872 11   327f32bb81b4f7e03131ce2cc4fa25ce
        IZ00521_10.070622.epkg.Z   26138 11   636584044285fda77d308194b7988b7c
        IZ00510_04.070622.epkg.Z   15081 11   96e94ffc7ff68bacdc5d624cd6ddf7fe
        IZ00510_05.070622.epkg.Z   57550 11   db98e7b8f3c212857f89e9252d74967d
        IZ00510_06.070622.epkg.Z   46918 11   e490d017608db8e83c9a04d56f25b348

        These sums should match exactly. The PGP signatures in the
        compressed tarball and on this advisory can also be used to verify
        the integrity of the various files they correspond to.  If the sums
        or signatures cannot be confirmed, double check the command results
        and the download site address.  If those are OK, contact IBM AIX
        Security at security-alert@austin.ibm.com and describe the
        discrepancy.

    C. INTERIM FIX INSTALLATION

        These packages use the new Interim Fix Management Solution to install
        and manage interim fixes.  More information can be found at:

        http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html

        To preview an epkg interim fix installation execute the following
        command:

        # emgr -e ipkg_name -p       # where ipkg_name is the name of the
                                     # interim fix package being previewed.

        To install an epkg interim fix package, execute the following command:

        # emgr -e ipkg_name -X       # where ipkg_name is the name of the
                                     # interim fix package being installed.

        The "X" flag will expand any filesystems if required.

VI. WORKAROUNDS

    If the atm functionality is not needed on your platform, the best solution
    is to remove the fileset listed above.

VII. OBTAINING FIXES

    AIX Version 5 APARs can be downloaded from:

        http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html

    Security related Interim Fixes can be downloaded from:

        ftp://aix.software.ibm.com/aix/efixes/security

VII. CONTACT INFORMATION

    If you would like to receive AIX Security Advisories via email, please
    visit:

        http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd

    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 communicate
    securely with the AIX Security Team send email to
    security-alert@austin.ibm.com with a subject of "get key". The key
    can also be downloaded from a PGP Public Key Server. The key id is
    0x4265D862.

    Please contact your local IBM AIX support center for any assistance.

    eServer is a trademark of International Business Machines Corporation.
    IBM, AIX and pSeries are registered trademarks of International Business
    Machines Corporation.  All other trademarks are property of their
    respective holders.

VIII. ACKNOWLEDGMENTS

    This vulnerability was discovered internal to IBM as part of its
    commitment to secure the AIX operating system.

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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                On call after hours for member emergencies only.
===========================================================================

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