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IBM SECURITY ADVISORY

First Issued: Mon Oct 29 12:33:35 CDT 2007
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX xfs heap vulnerabilities

PLATFORMS:       AIX 5.2, 5.3

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

THREAT:          A remote attacker may run arbitrary code with root
                 privileges.

CERT VU Number:  n/a
CVE Number:      CVE-2007-4568 and CVE-2007-4990
===============================================================================
                           DETAILED INFORMATION

I. OVERVIEW

    xfs is the AIXwindows font server. It supplies fonts to AIXwindows
    display servers.  The primary fileset for the AIX font server is
    'X11.fnt.fontServer'.  The xfs command provided by this fileset
    contains two heap vulnerabilities.

II. DESCRIPTION

    A heap vulnerability exists in the 'X11.fnt.fontServer'
    fileset command listed below.  A remote attacker may execute
    arbitrary code with root privileges because the service runs with
    root privileges.

    For more details please visit:

        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4568
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4990

    The following 'X11.fnt.fontServer' command is vulnerable: 

        /usr/lpp/X11/bin/xfs

III. IMPACT

    The successful exploitation of this vulnerability allows a
    non-privileged user to execute code with root privileges.

IV. PLATFORM VULNERABILITY ASSESSMENT

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

    # lslpp -l X11.fnt.fontServer

    The following fileset levels are vulnerable:

    AIX Fileset        AIX Level       Lower Level       Upper Level
    ----------------------------------------------------------------
    X11.fnt.fontServer 5.2.0           5.2.0.0           5.2.0.105
    X11.fnt.fontServer 5.3.0           5.3.0.0           5.3.0.60

    NOTE: IBM only supports the latest two releases (AIX 5.2 and 5.3)
    and the latest three Technology Levels (AIX 5.2 TL08, TL09, TL10
    and AIX 5.3 TL04, TL05, TL06).  Affected customers are urged to
    upgrade to the latest applicable Technology Level and Service
    Pack.

V. SOLUTIONS

    A. APARS

        IBM provides the following fixes:

        AIX Level           APAR number       Availability
        --------------------------------------------------------------------
        5.2.0               IZ06001           10/31/2007
        5.3.0               IZ06648           11/27/2007

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IZ06001
        http://www.ibm.com/support/docview.wss?uid=isg1IZ06648

        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.

        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/xfs_ifix.tar

        The link above is to a tar file containing this signed
        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 Fileset         AIX Release and      Interim fix
                            Technology Level
        -----------------------------------------------------------------
        X11.fnt.fontServer  5200-08              IZ06001.071023.epkg.Z
        X11.fnt.fontServer  5200-09              IZ06001.071023.epkg.Z
        X11.fnt.fontServer  5200-10              IZ06001.071023.epkg.Z
        X11.fnt.fontServer  5300-04              IZ06648.071023.epkg.Z
        X11.fnt.fontServer  5300-05              IZ06648.071023.epkg.Z
        X11.fnt.fontServer  5300-06              IZ06648.071023.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.
        
        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
        ------------------------------------
        11058   328 IZ06001.071023.epkg.Z
        60189   335 IZ06648.071023.epkg.Z

        cksum             filename
        ------------------------------------------
        1175775233 334915 IZ06001.071023.epkg.Z
        1434263760 342313 IZ06648.071023.epkg.Z

        csum -h MD5 (md5sum)              filename
        ----------------------------------------------------------
        d264535d2a23d1914bd81632fbd6519e  IZ06001.071023.epkg.Z
        9815b9c89955c9cca4aa9f68d3a19250  IZ06648.071023.epkg.Z

        csum -h SHA1 (sha1sum)                    filename
        ------------------------------------------------------------------
        ddd762c6ce68e657bed89c29def8e3ca4356f9a1  IZ06001.071023.epkg.Z
        4eda201efb0bdbf89273828ff6c68336f38c3757  IZ06648.071023.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
        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 you are running xfs there are no known workarounds.  If the
    service is not needed and is running, shut it down.

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

VIII. 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.

IX. ACKNOWLEDGMENTS

    This vulnerability was reported by iDefense Labs.
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