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IBM SECURITY ADVISORY
 
First Issued: Wed Feb 27 12:22:34 CST 2008
===============================================================================
                           VULNERABILITY SUMMARY
 
VULNERABILITY:   AIX libc inet_network buffer overflow
 
PLATFORMS:       AIX 5.2, 5.3, 6.1
 
SOLUTION:        Apply the fix as described below.
 
THREAT:          A remote attacker may execute arbitrary code.
 
CVE Number:      CVE-2008-0122
===============================================================================
                           DETAILED INFORMATION
 
I. DESCRIPTION
 
    There is an off-by-one error in the AIX libc implementation of the
    inet_network function.  Programs which call this function will be
    vulnerable.  Please refer to the following links for more
    information:
 
    http://security.freebsd.org/advisories/FreeBSD-SA-08:02.libc.asc
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0122
 
    The successful exploitation of this vulnerability allows a
    remote user to execute arbitrary code.
 
    The following library is vulnerable:
 
        /usr/ccs/lib/libc.a
 
II. PLATFORM VULNERABILITY ASSESSMENT
 
    To determine if your system is vulnerable, execute the following
    command:
 
    lslpp -L bos.rte.libc
 
    The following fileset levels are vulnerable:
 
    AIX Fileset        Lower Level       Upper Level
    ------------------------------------------------
    bos.rte.libc       5.2.0.0           5.2.0.109
    bos.rte.libc       5.3.0.0           5.3.0.66
    bos.rte.libc       5.3.7.0           5.3.7.3
    bos.rte.libc       6.1.0.0           6.1.0.3
 
    NOTE: AIX 5.3 TL6 SP6 and AIX 5.3 TL7 SP3 will not contain this
    fix when they are released.  An updated ifix will be released when
    the service packs are released.
 
III. SOLUTIONS
 
    A. APARS
 
        IBM has assigned the following APARs to this problem:
 
        AIX Level           APAR number        Availability
        ---------------------------------------------------
        5.2.0               IZ15564            05/07/08
        5.3.0               IZ15567            05/28/08
        5.3.7               IZ15566            05/28/08
        6.1.0               IZ15565            04/09/08
 
        Subscribe to the APARs here:
 
        http://www.ibm.com/support/docview.wss?uid=isg1IZ15564
        http://www.ibm.com/support/docview.wss?uid=isg1IZ15567
        http://www.ibm.com/support/docview.wss?uid=isg1IZ15566
        http://www.ibm.com/support/docview.wss?uid=isg1IZ15565
 
        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/libc_ifix.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          Interim Fix
        -------------------------------------------------------------------
        5.2.0 TL8          IZ15564_08.080219.epkg.Z
        5.2.0 TL9          IZ15564_09.080219.epkg.Z
        5.2.0 TL10         IZ15564_10.080219.epkg.Z
        5.3.0 TL5          IZ15567_05.080219.epkg.Z
        5.3.0 TL6          IZ15567_06.080219.epkg.Z
        5.3.7              IZ15566_07.080219.epkg.Z
        6.1.0              IZ15565_00.080219.epkg.Z
 
        To extract the fixes from the tar file:
 
        tar xvf libc_ifix.tar
        cd libc_ifix
 
        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
        ------------------------------------
        29751  3152 IZ15564_08.080219.epkg.Z
        19549  3172 IZ15564_09.080219.epkg.Z
        52071  3186 IZ15564_10.080219.epkg.Z
        53605  4731 IZ15565_00.080219.epkg.Z
        44251  4047 IZ15566_07.080219.epkg.Z
        11422  3565 IZ15567_05.080219.epkg.Z
        51632  4007 IZ15567_06.080219.epkg.Z
 
        cksum              filename
        ------------------------------------------
        2980046000 3226933 IZ15564_08.080219.epkg.Z
        1510474728 3247126 IZ15564_09.080219.epkg.Z
        168637892  3261516 IZ15564_10.080219.epkg.Z
        683046070  4843871 IZ15565_00.080219.epkg.Z
        2090894068 4143462 IZ15566_07.080219.epkg.Z
        1361113499 3649666 IZ15567_05.080219.epkg.Z
        1757932115 4102745 IZ15567_06.080219.epkg.Z
 
        csum -h MD5 (md5sum)              filename
        ----------------------------------------------------------
        652e8276e898720487b6d71072601b66  IZ15564_08.080219.epkg.Z
        0dce26937a5c37af54f7530beb7e4c09  IZ15564_09.080219.epkg.Z
        4c315531586da4fce4ff752ee067408f  IZ15564_10.080219.epkg.Z
        22c2ad002375f05f59c25f68e36a27a3  IZ15565_00.080219.epkg.Z
        76c61645664e64acdb89e739b8a42daf  IZ15566_07.080219.epkg.Z
        985dc8bbcb71f09b8874944f302e4498  IZ15567_05.080219.epkg.Z
        359417df76c8e1ae31d281c49e112daf  IZ15567_06.080219.epkg.Z
 
        csum -h SHA1 (sha1sum)                    filename
        ------------------------------------------------------------------
        37ce37b514f046dea0990540b787350d2b037e9e  IZ15564_08.080219.epkg.Z
        18ac4146cd3eadeb3c0ecbee11d720efc29a4076  IZ15564_09.080219.epkg.Z
        b852a9ae018fe380f07048b20510f794b15b1610  IZ15564_10.080219.epkg.Z
        79d367b661490c226a08acb7e0dc87f223addbc5  IZ15565_00.080219.epkg.Z
        3cbe8222775007e860fc9b5227d79c3d773d54e3  IZ15566_07.080219.epkg.Z
        d2e334e464c4b49fe731cc586dd786a3a79dd33a  IZ15567_05.080219.epkg.Z
        c54d19e8d7114ab40101025f43bfc8b27f18eb38  IZ15567_06.080219.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. 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.
 
        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 no workarounds.
 
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
 
    Bjoern A. Zeeb and Nate Eldredge reported this vulnerability.
 
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