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

                          ESB-2008.0264 -- [AIX]
               AIX nddstat family environment variable error
                               14 March 2008

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

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

Product:              nddstat
Publisher:            IBM
Operating System:     AIX
Impact:               Execute Arbitrary Code/Commands
Access:               Existing Account

Original Bulletin:    
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=18&ID=4158

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IBM SECURITY ADVISORY

First Issued: Tue Mar 11 10:01:36 CDT 2008
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:      AIX nddstat family environment variable error

PLATFORMS:          AIX 5.2, 5.3, 6.1

SOLUTION:           Apply the fix or workaround as described below.

THREAT:             A local attacker may execute arbitrary code.

CVE Number:         n/a

Reboot required?    NO
Workarounds?        YES
Protected by FPM?   YES (high, medium, or low)
Protected by SED?   NO
===============================================================================
                           DETAILED INFORMATION

I. DESCRIPTION

    The nddstat family of commands contains an environment variable
    handling error.  A local attacker may exploit this error to
    execute arbitrary code with root privileges because the commands
    are setuid root.

    The following files are vulnerable:

    /usr/sbin/atmstat
    /usr/sbin/entstat
    /usr/sbin/fddistat
    /usr/sbin/hdlcstat
    /usr/sbin/tokstat

II. PLATFORM VULNERABILITY ASSESSMENT

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

    lslpp -L devices.common.IBM.atm.rte \
    devices.common.IBM.ethernet.rte \
    devices.common.IBM.hdlc.rte \
    devices.common.IBM.fddi.rte \
    devices.common.IBM.tokenring.rte

    The following fileset levels are vulnerable:

    AIX Fileset                      Lower Level    Upper Level
    -----------------------------------------------------------
    devices.common.IBM.atm.rte       5.2.0.50       5.2.0.51
    devices.common.IBM.atm.rte       5.2.0.95       5.2.0.95
    devices.common.IBM.atm.rte       5.2.0.95       5.2.0.96
    devices.common.IBM.atm.rte       5.3.0.50       5.3.0.50
    devices.common.IBM.atm.rte       5.3.0.60       5.3.0.61
    devices.common.IBM.atm.rte       5.3.7.0        5.3.7.0
    devices.common.IBM.atm.rte       6.1.0.0        6.1.0.0

    devices.common.IBM.ethernet.rte  5.2.0.85       5.2.0.85
    devices.common.IBM.ethernet.rte  5.2.0.95       5.2.0.95
    devices.common.IBM.ethernet.rte  5.2.0.105      5.2.0.107
    devices.common.IBM.ethernet.rte  5.3.0.50       5.3.0.50
    devices.common.IBM.ethernet.rte  5.3.0.60       5.3.0.62
    devices.common.IBM.ethernet.rte  5.3.7.0        5.3.7.1
    devices.common.IBM.ethernet.rte  6.1.0.0        6.1.0.1

    devices.common.IBM.fddi.rte      5.2.0.30       5.2.0.30
    devices.common.IBM.fddi.rte      5.2.0.95       5.2.0.95
    devices.common.IBM.fddi.rte      5.2.0.95       5.2.0.95
    devices.common.IBM.fddi.rte      5.3.0.50       5.3.0.50
    devices.common.IBM.fddi.rte      5.3.0.50       5.3.0.50
    devices.common.IBM.fddi.rte      5.3.0.50       5.3.0.50

    devices.common.IBM.hdlc.rte      5.2.0.10       5.2.0.10
    devices.common.IBM.hdlc.rte      5.2.0.95       5.2.0.95
    devices.common.IBM.hdlc.rte      5.2.0.95       5.2.0.95
    devices.common.IBM.hdlc.rte      5.3.0.50       5.3.0.50
    devices.common.IBM.hdlc.rte      5.3.0.50       5.3.0.50
    devices.common.IBM.hdlc.rte      5.3.7.0        5.3.7.0
    devices.common.IBM.hdlc.rte      6.1.0.0        6.1.0.0

    devices.common.IBM.tokenring.rte 5.2.0.30       5.2.0.30
    devices.common.IBM.tokenring.rte 5.2.0.95       5.2.0.95
    devices.common.IBM.tokenring.rte 5.2.0.95       5.2.0.95
    devices.common.IBM.tokenring.rte 5.3.0.50       5.3.0.50
    devices.common.IBM.tokenring.rte 5.3.0.50       5.3.0.50
    devices.common.IBM.tokenring.rte 5.3.7.0        5.3.7.0
    devices.common.IBM.tokenring.rte 6.1.0.0        6.1.0.0

III. SOLUTIONS

    A. APARS

        IBM has assigned the following APARs to this problem:

        AIX Level           APAR number        Availability
        ---------------------------------------------------
        5.2.0               IZ16991            Now
        5.3.0               IZ17058            3/17/2008
        5.3.7               IZ17059            3/17/2008
        6.1.0               IZ16975            Now

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IZ16991
        http://www.ibm.com/support/docview.wss?uid=isg1IZ17058
        http://www.ibm.com/support/docview.wss?uid=isg1IZ17059
        http://www.ibm.com/support/docview.wss?uid=isg1IZ16975

        By subscribing, you will receive periodic email alerting you
        to the status of the APAR, and a link to download the fix once
        it becomes available.

    B. FIXES

        Fixes are available.  The fixes can be downloaded via ftp
        from:

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

        The link above is to a tar file containing this signed
        advisory, fix packages, and PGP signatures for each package.
        The fixes below include prerequisite checking. This will
        enforce the correct mapping between the fixes and AIX
        Technology Levels.

        AIX Level          Fix (*.U) and Interim Fix (*.Z)
        -------------------------------------------------------------------
        5.2.0 TL8          IZ16991_8a.080306.epkg.Z
                           IZ16991_8b.080306.epkg.Z
                           IZ16991_8c.080306.epkg.Z
                           IZ16991_8d.080306.epkg.Z
                           IZ16991_8e.080306.epkg.Z
        5.2.0 TL9          IZ16991_9a.080306.epkg.Z
                           IZ16991_9b.080306.epkg.Z
                           IZ16991_9c.080306.epkg.Z
                           IZ16991_9d.080306.epkg.Z
                           IZ16991_9e.080306.epkg.Z
        5.2.0 TL10         devices.common.IBM.atm.rte.5.2.0.97.U           
                           devices.common.IBM.ethernet.rte.5.2.0.108.U
                           devices.common.IBM.fddi.rte.5.2.0.96.U          
                           devices.common.IBM.hdlc.rte.5.2.0.96.U          
                           devices.common.IBM.tokenring.rte.5.2.0.96.U
        5.3.0 TL5          IZ17058_5a.080306.epkg.Z
                           IZ17058_5b.080306.epkg.Z
                           IZ17058_5c.080306.epkg.Z
                           IZ17058_5d.080306.epkg.Z
                           IZ17058_5e.080306.epkg.Z
        5.3.0 TL6          IZ17058_6a.080306.epkg.Z
                           IZ17058_6b.080306.epkg.Z
                           IZ17058_6c.080306.epkg.Z
                           IZ17058_6d.080306.epkg.Z
                           IZ17058_6e.080306.epkg.Z
        5.3.0 TL7          IZ17059_7a.080306.epkg.Z
                           IZ17059_7b.080306.epkg.Z
                           IZ17059_7c.080306.epkg.Z
                           IZ17059_7d.080306.epkg.Z
                           IZ17059_7e.080306.epkg.Z
        6.1.0              devices.common.IBM.atm.rte.6.1.0.1.U   
                           devices.common.IBM.ethernet.rte.6.1.0.2.U 
                           devices.common.IBM.hdlc.rte.6.1.0.1.U          
                           devices.common.IBM.tokenring.rte.6.1.0.1.U

        To extract the fixes from the tar file:

        tar xvf nddstat_fix.tar
        cd nddstat_fix

        Verify you have retrieved the fixes intact:

        The checksums below were generated using the "sum", "cksum",
        "csum -h MD5" (md5sum), and "csum -h SHA1" (sha1sum) commands
        and are as follows:

        sum         filename
        ------------------------------------
        53686  1363 atm.rte.5.2.0.97.U
        10325    25 atm.rte.6.1.0.1.U
        15289   396 ethernet.rte.5.2.0.108.U
        22432   129 ethernet.rte.6.1.0.2.U
        48254    42 fddi.rte.5.2.0.96.U
        33569    20 hdlc.rte.5.2.0.96.U
        35035    22 hdlc.rte.6.1.0.1.U
        02819    57 tokenring.rte.5.2.0.96.U
        57875    24 tokenring.rte.6.1.0.1.U
        08519    18 IZ16991_8a.080306.epkg.Z
        16435    19 IZ16991_8b.080306.epkg.Z
        01458    17 IZ16991_8c.080306.epkg.Z
        06627    15 IZ16991_8d.080306.epkg.Z
        35832    17 IZ16991_8e.080306.epkg.Z
        36064    18 IZ16991_9a.080306.epkg.Z
        11623    19 IZ16991_9b.080306.epkg.Z
        45551    17 IZ16991_9c.080306.epkg.Z
        40138    15 IZ16991_9d.080306.epkg.Z
        59776    17 IZ16991_9e.080306.epkg.Z
        54366    19 IZ17058_5a.080306.epkg.Z
        11671    19 IZ17058_5b.080306.epkg.Z
        49694    18 IZ17058_5c.080306.epkg.Z
        34372    17 IZ17058_5d.080306.epkg.Z
        20566    17 IZ17058_5e.080306.epkg.Z
        23319    19 IZ17058_6a.080306.epkg.Z
        60392    20 IZ17058_6b.080306.epkg.Z
        15769    18 IZ17058_6c.080306.epkg.Z
        63261    17 IZ17058_6d.080306.epkg.Z
        28206    18 IZ17058_6e.080306.epkg.Z
        60970    19 IZ17059_7a.080306.epkg.Z
        02919    20 IZ17059_7b.080306.epkg.Z
        62108    18 IZ17059_7c.080306.epkg.Z
        52386    17 IZ17059_7d.080306.epkg.Z
        32268    18 IZ17059_7e.080306.epkg.Z

        cksum              filename
        ------------------------------------------
        2977679174 1395712 atm.rte.5.2.0.97.U
        3586647696 25600 atm.rte.6.1.0.1.U
        1871589933 405504 ethernet.rte.5.2.0.108.U
        3810839561 132096 ethernet.rte.6.1.0.2.U
        2308602268 43008 fddi.rte.5.2.0.96.U
        1079970021 20480 hdlc.rte.5.2.0.96.U
        2470393603 22528 hdlc.rte.6.1.0.1.U
        302314036 58368 tokenring.rte.5.2.0.96.U
        2234336109 24576 tokenring.rte.6.1.0.1.U
        2484809175 17503 IZ16991_8a.080306.epkg.Z
        2365916858 19223 IZ16991_8b.080306.epkg.Z
        1229509259 17289 IZ16991_8c.080306.epkg.Z
        4200613508 15200 IZ16991_8d.080306.epkg.Z
        2503444817 16985 IZ16991_8e.080306.epkg.Z
        955167659 17501 IZ16991_9a.080306.epkg.Z
        2466035120 19228 IZ16991_9b.080306.epkg.Z
        1971773075 17295 IZ16991_9c.080306.epkg.Z
        3393887566 15196 IZ16991_9d.080306.epkg.Z
        1368755465 16990 IZ16991_9e.080306.epkg.Z
        1911176163 19216 IZ17058_5a.080306.epkg.Z
        2449935365 19451 IZ17058_5b.080306.epkg.Z
        3215953030 17466 IZ17058_5c.080306.epkg.Z
        1595223683 17053 IZ17058_5d.080306.epkg.Z
        3666703913 17358 IZ17058_5e.080306.epkg.Z
        1328517438 19186 IZ17058_6a.080306.epkg.Z
        3674604030 19529 IZ17058_6b.080306.epkg.Z
        1085139383 17569 IZ17058_6c.080306.epkg.Z
        4140465697 17235 IZ17058_6d.080306.epkg.Z
        2010320015 17543 IZ17058_6e.080306.epkg.Z
        2624580258 19172 IZ17059_7a.080306.epkg.Z
        762491607 19547 IZ17059_7b.080306.epkg.Z
        4064419777 17573 IZ17059_7c.080306.epkg.Z
        3751266901 17239 IZ17059_7d.080306.epkg.Z
        2021263771 17517 IZ17059_7e.080306.epkg.Z

        csum -h MD5 (md5sum)              filename
        ----------------------------------------------------------
        99befbb0608f3f19ba31ddd06c0e3ee5  atm.rte.5.2.0.97.U
        423a3d4bc846b09b238e600b436be0ca  atm.rte.6.1.0.1.U
        ff1b20fa99311224208be69a757de9ee  ethernet.rte.5.2.0.108.U
        211e387feb1ae3b2c8f936068de5c60d  ethernet.rte.6.1.0.2.U
        56284a52153fc1d20315b71cf9a0de0f  fddi.rte.5.2.0.96.U
        9e81a891ea6b406b165e5a9024241c7d  hdlc.rte.5.2.0.96.U
        b353997c80555d349b519de10eb2c244  hdlc.rte.6.1.0.1.U
        6cda672a5371539e2d1c2cf06f0872f9  tokenring.rte.5.2.0.96.U
        67dc1b0b9e95e72ad6655f0ead46ccb3  tokenring.rte.6.1.0.1.U
        d9cdbe062aba68b2c756b3e0e9eb6598  IZ16991_8a.080306.epkg.Z
        99770175de8ea0d16beeb591a9f08a76  IZ16991_8b.080306.epkg.Z
        9dabb3047673533ed7892c779915186a  IZ16991_8c.080306.epkg.Z
        8751dc6c05eba9c04f195c0525133adc  IZ16991_8d.080306.epkg.Z
        1ff2c51206bcbdf955b27b5aec5ee578  IZ16991_8e.080306.epkg.Z
        95e1a156e31e9f798fffdb440a3d6d24  IZ16991_9a.080306.epkg.Z
        effb74656bb80a481dea3ed0557bea57  IZ16991_9b.080306.epkg.Z
        7098143faaea7a868c6cba91c3c7efa3  IZ16991_9c.080306.epkg.Z
        a966283b7f6c04374f750d5a92cd90fa  IZ16991_9d.080306.epkg.Z
        41d93e2f1e07bf8500df0370a95b7f2f  IZ16991_9e.080306.epkg.Z
        7f4bb6dcf59fa1430bbed8e290a98e06  IZ17058_5a.080306.epkg.Z
        334eb6ad284b4e6f9345a7664e1ef9f8  IZ17058_5b.080306.epkg.Z
        4a21d9deda002c642cf8df95250da373  IZ17058_5c.080306.epkg.Z
        d27d29b43e71eb047280966168f656e8  IZ17058_5d.080306.epkg.Z
        5b6d741bbd10adb319a9290df76d4815  IZ17058_5e.080306.epkg.Z
        b3933b23b9f998575563354f838d1abf  IZ17058_6a.080306.epkg.Z
        9534e3d239f14058b87b856bdc9cb8ca  IZ17058_6b.080306.epkg.Z
        7e685ce1d13ed48cb783dd825dd76db0  IZ17058_6c.080306.epkg.Z
        d1b4a6f69ab836e6d4430a677a9f2390  IZ17058_6d.080306.epkg.Z
        be0b017e1f1cb30e3a0de8db7476ab80  IZ17058_6e.080306.epkg.Z
        17c66bb5981e4c8d6143423d1664301d  IZ17059_7a.080306.epkg.Z
        f6634ba7b4cf59d10524c04bc245bffa  IZ17059_7b.080306.epkg.Z
        b5ec2de592875f9c16269c9aedfba1cd  IZ17059_7c.080306.epkg.Z
        995c8efbd3ce853e733730ee43cd96fd  IZ17059_7d.080306.epkg.Z
        5dd668bb407836763829f1c6d5a38ffa  IZ17059_7e.080306.epkg.Z

        csum -h SHA1 (sha1sum)                    filename
        ------------------------------------------------------------------
        6e13d75620a7535925801d83c2cdbaf0a8f6c2b8  atm.rte.5.2.0.97.U
        c7ca2ae619c0ed06d42ddf17c9140ac3f67359b0  atm.rte.6.1.0.1.U
        33e9ea17604444e0d1853d0e16ee627e1364b430  ethernet.rte.5.2.0.108.U
        94fc8037116141b602ecbbe56990b00a6480d313  ethernet.rte.6.1.0.2.U
        4e2cb524de53efcef5a0f22a69ed03b43f034a97  fddi.rte.5.2.0.96.U
        1bb826adae974991690f6493c334b5870358d36a  hdlc.rte.5.2.0.96.U
        6993b0f39e3a431b1ef6fdf2cc66bbdfefb34925  hdlc.rte.6.1.0.1.U
        3c230f35ad5de5c2b0d1b8f35eb00eaaca5b1fb9  tokenring.rte.5.2.0.96.U
        1f1e5cee6ea02b142990a2416261e25af53100d4  tokenring.rte.6.1.0.1.U
        1f037d9bf175f02f4d17b0b4de4b5ca0646f0ec4  IZ16991_8a.080306.epkg.Z
        0233a83d96759dd3b29094deaeb1e742c078a879  IZ16991_8b.080306.epkg.Z
        0152e24bcd83c7baabbec2cb319d4fc80e91bc9c  IZ16991_8c.080306.epkg.Z
        e4d73e22f7da781c2f0e54316ae07a153af4edf7  IZ16991_8d.080306.epkg.Z
        de6634059d76368a012cf3346b0a597f6335dedf  IZ16991_8e.080306.epkg.Z
        6f829cad191090176fa114eb35ae64b44f14b1f8  IZ16991_9a.080306.epkg.Z
        02be500d0939fbbe3b6e0e60a757d08a5be0ba7c  IZ16991_9b.080306.epkg.Z
        07387b971fd7c05370101dea075c06138ee71d31  IZ16991_9c.080306.epkg.Z
        ba9b309eb39e3a425be3ab6bbf5eefbc1b6fe0e4  IZ16991_9d.080306.epkg.Z
        22b3e9a071b4053c41018d6bf0c738cb36490b10  IZ16991_9e.080306.epkg.Z
        702798d0ccb786d7bdb32b479645e4de24fb8ca8  IZ17058_5a.080306.epkg.Z
        7e80a6a748a375256108032c7dd44f4eebc86999  IZ17058_5b.080306.epkg.Z
        51b9d18daf8da727f3f1e66ecf835853d608faa6  IZ17058_5c.080306.epkg.Z
        924cd69454c55170fb070c2ee10cc2b471683af4  IZ17058_5d.080306.epkg.Z
        ec5d1de2b624bfef43c73046b49713421a73a76e  IZ17058_5e.080306.epkg.Z
        c2e477467b3d3884b0cd72ec3271aec978bca6c4  IZ17058_6a.080306.epkg.Z
        43891ec55d3daee98585fa4047591fa0d6e4d62e  IZ17058_6b.080306.epkg.Z
        bae5b8d756c740b61159f33f518eb689a2aab22f  IZ17058_6c.080306.epkg.Z
        c6a3325f69d8f2419c7748398461d01a799ae161  IZ17058_6d.080306.epkg.Z
        81b36492f1a63795dba9cd7ef7d2f6b3c7eb0aa3  IZ17058_6e.080306.epkg.Z
        51969438338959746649f5e54d119d2d8f1bd2f1  IZ17059_7a.080306.epkg.Z
        a2b29ee5e7ecd67419300cc68284306d2c41832f  IZ17059_7b.080306.epkg.Z
        5c26fa266f7e707fef9b5c02eb27a0c83e70bcd2  IZ17059_7c.080306.epkg.Z
        f034df79cdcdf29c1ccbbf9320ed59ab04f74d78  IZ17059_7d.080306.epkg.Z
        a2ed509001cabdbca612f7662eeb49b4fbb30cbd  IZ17059_7e.080306.epkg.Z

        To verify the sums, use the text of this advisory as input to
        csum, md5sum, or sha1sum. For example:

        csum -h SHA1 -i Advisory.asc
        md5sum -c Advisory.asc
        sha1sum -c Advisory.asc

        These sums should match exactly. The PGP signatures in the tar
        file and on this advisory can also be used to verify the
        integrity of the fixes.  If the sums or signatures cannot be
        confirmed, contact IBM AIX Security at
        security-alert@austin.ibm.com and describe the discrepancy.

     C. FIX AND INTERIM FIX INSTALLATION

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

        To preview a fix installation:

        installp -a -d fix_name -p all  # where fix_name is the name of the
                                        # fix package being previewed.
        To install a fix package:

        installp -a -d fix_name -X all  # where fix_name is the name of the  
                                        # fix package being installed.

        Interim fixes have had limited functional and regression
        testing but not the full regression testing that takes place
        for Service Packs; thus, IBM does not warrant the fully
        correct functionality of an interim fix.

        Interim fix management documentation can be found at:

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

        To preview an interim fix installation:

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

        To install an interim fix package:

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

IV. WORKAROUNDS

    There are two workarounds available.

    A. OPTION 1

        Change the permissions of these commands to remove the setuid
        bit using the following commands:

        chmod 500 /usr/sbin/atmstat
        chmod 500 /usr/sbin/entstat
        chmod 500 /usr/sbin/fddistat
        chmod 500 /usr/sbin/hdlcstat
        chmod 500 /usr/sbin/tokstat

        NOTE: chmod will disable functionality of these commands for
        all users except root.

    B. OPTION 2 (AIX 6.1, AIX 5.3 TL6 and TL7)

        Use the File Permissions Manager (fpm) command to manage
        setuid and setgid programs.

        fpm documentation can be found in the AIX 6 Security Redbook
        at:

        http://www.redbooks.ibm.com/abstracts/sg247430.html

        An fpm level of high, medium, or low will remove the setuid
        bit from the affected commands.  For example:

        fpm -l high -p    # to preview changes
        fpm -l high       # to execute changes

        NOTE: Please review the documentation before execution.  fpm
        will disable functionality of multiple commands for all users
        except root.


V. OBTAINING FIXES

    AIX security fixes can be downloaded from:

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

    AIX fixes can be downloaded from:

        http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix

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

VI. 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 you can either:

        A. Send an email with "get key" in the subject line to:

            security-alert@austin.ibm.com

        B. Download the key from a PGP Public Key Server. The key ID is:

            0xA6A36CCC

    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.

VII. ACKNOWLEDGMENTS

    IBM discovered and fixed this vulnerability as part of its
    commitment to secure the AIX operating system.

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- --------------------------END INCLUDED TEXT--------------------

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        http://www.auscert.org.au/render.html?it=3192

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

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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 member emergencies only.
===========================================================================

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