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ESB-2009.1381.2 - UPDATE [AIX] rpc.cmsd: Root compromise - Remote/unauthenticated

Date: 16 October 2009
Related Files: ESB-2009.1381  

Click here for printable version
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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2009.1381.2
             AIX rpc.cmsd remote buffer overflow vulnerability
                              16 October 2009

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

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

Product:           rpc.cmsd
                   Calendar daemon library (libcsa.a)
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Root Compromise                 -- Remote/Unauthenticated
                   Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-3699  

Original Bulletin: 
   http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=18&ID=4803&myns=paix53&mync=E

Revision History:  October 16 2009: Added CVE reference
                   October  8 2009: Initial Release

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IBM SECURITY ADVISORY

First Issued: Wed Oct  7 10:25:46 CDT 2009

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/cmsd_advisory.asc
or
ftp://aix.software.ibm.com/aix/efixes/security/cmsd_advisory.asc

                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX rpc.cmsd remote buffer overflow vulnerability

PLATFORMS:       AIX 5.3, 6.1, and earlier releases
                 VIOS 1.4, 1.5, 2.1, and earlier releases

SOLUTION:        Apply the fix or workaround as described below.

THREAT:          A remote attacker may execute arbitrary code as root.

Reboot required?    NO
Workarounds?        YES
Protected by FPM?   NO
Protected by SED?   YES

                           DETAILED INFORMATION

I. DESCRIPTION

    There is a buffer overflow vulnerability in the calendar daemon
    library libcsa.a.  A remote attacker can exploit this
    vulnerability when the rpc.cmsd calendar daemon is enabled in
    /etc/inetd.conf.

    The successful exploitation of this vulnerability allows a remote
    attacker to execute arbitrary code as the root user.

    The following libraries and executables are vulnerable:

        /usr/dt/bin/rpc.cmsd
        /usr/dt/lib/libcsa.a

II. PLATFORM VULNERABILITY ASSESSMENT

    Note: To use the following commands on VIOS you must first
    execute:

    oem_setup_env

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

    lslpp -L X11.Dt.lib X11.Dt.rte

    The following fileset levels are vulnerable:

    AIX Fileset        Lower Level       Upper Level
    ------------------------------------------------
                       all earlier levels are vulnerable
    X11.Dt.rte         5.3.7.0           5.3.7.3
    X11.Dt.lib         5.3.7.0           5.3.7.2
    X11.Dt.rte         5.3.8.0           5.3.8.1
    X11.Dt.lib         5.3.8.0           5.3.8.0
    X11.Dt.rte         5.3.9.0           5.3.9.0
    X11.Dt.lib         5.3.9.0           5.3.9.0
    X11.Dt.rte         5.3.10.0          5.3.10.0
    X11.Dt.lib         5.3.9.0           5.3.9.0
    X11.Dt.rte         6.1.0.0           6.1.0.3
    X11.Dt.lib         6.1.0.0           6.1.0.2
    X11.Dt.rte         6.1.1.0           6.1.1.1
    X11.Dt.lib         6.1.1.0           6.1.1.0
    X11.Dt.rte         6.1.2.0           6.1.2.1
    X11.Dt.lib         6.1.2.0           6.1.2.1
    X11.Dt.rte         6.1.3.0           6.1.3.1
    X11.Dt.lib         6.1.3.0           6.1.3.1

III. SOLUTIONS

    A. APARS

        IBM has assigned the following APARs to this problem:

        AIX Level           APAR number        Availability
        ---------------------------------------------------
        5.3.0               IZ62672            interm fix only
        5.3.7               IZ61628            11/11/09 (sp10)
        5.3.8               IZ62237            11/11/09 (sp8)
        5.3.9               IZ61717            11/11/09 (sp5)
        5.3.10              IZ62123            11/11/09 (sp2)
        6.1.0               IZ62569            12/16/09 (sp11)
        6.1.1               IZ62570            12/16/09 (sp7)
        6.1.2               IZ62571            12/16/09 (sp6)
        6.1.3               IZ62572            12/16/09 (sp3)

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IZ62672
        http://www.ibm.com/support/docview.wss?uid=isg1IZ61628
        http://www.ibm.com/support/docview.wss?uid=isg1IZ62237
        http://www.ibm.com/support/docview.wss?uid=isg1IZ61717
        http://www.ibm.com/support/docview.wss?uid=isg1IZ62123
        http://www.ibm.com/support/docview.wss?uid=isg1IZ62569
        http://www.ibm.com/support/docview.wss?uid=isg1IZ62570
        http://www.ibm.com/support/docview.wss?uid=isg1IZ62571
        http://www.ibm.com/support/docview.wss?uid=isg1IZ62572

        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 now available.  The fixes can be downloaded from:

        ftp://aix.software.ibm.com/aix/efixes/security/cmsd_fix.tar
        http://aix.software.ibm.com/aix/efixes/security/cmsd_fix.tar

        The links above are to a tar file containing this signed
        advisory, fix packages, and PGP signatures for each package.

        AIX Level    VIOS Level      Interim Fix (*.Z)
        -------------------------------------------------------------------
        5.3.0 TL6    1.4             IZ62672_06.091004.epkg.Z
        5.3.7        1.5.0, 1.5.1    IZ61628_07.091003.epkg.Z
        5.3.8        1.5.2           IZ62237_08.091003.epkg.Z
        5.3.9                        IZ61717_09.091003.epkg.Z
        5.3.10                       IZ62123_10.091003.epkg.Z
        6.1.0                        IZ62569_00.091003.epkg.Z
        6.1.1                        IZ62570_01.091003.epkg.Z
        6.1.2        2.1.0           IZ62571_02.091003.epkg.Z
        6.1.3        2.1.1           IZ62572_03.091003.epkg.Z

        To extract the fixes from the tar file:

        tar xvf cmsd_fix.tar
        cd cmsd_fix

        Verify you have retrieved the fixes intact:

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

        csum -h SHA1 (sha1sum)                    filename
        ------------------------------------------------------------------
        be8a1acdcb4f09cb62da9d42ea04c3feb9002559  IZ61628_07.091003.epkg.Z
        3777d7ca7e9d8d5a74d3364c55bce9f4d4550527  IZ61717_09.091003.epkg.Z
        8bf77f5a19cdf757560cd2add98fb01b51539dca  IZ62123_10.091003.epkg.Z
        1bc742596171d1cbfa3d48ddcf1111936d9feded  IZ62237_08.091003.epkg.Z
        7fca0ba4d5b43f0896acdffea0a5b427bbef451b  IZ62569_00.091003.epkg.Z
        943641406c4f1b8bb50cd3a7f459352acb26a4ac  IZ62570_01.091003.epkg.Z
        a9582999d68bb7aac9af2f64e80a8282be9bdef3  IZ62571_02.091003.epkg.Z
        fb2dea536f6e5050f40da336ac4f64f835d74fe7  IZ62572_03.091003.epkg.Z
        8588b683a5dc1c5796317e0be77b065fea7dc14d  IZ62672_06.091004.epkg.Z

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

        csum -h SHA1 -i 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 and describe the
        discrepancy at the following address:

            security-alert@austin.ibm.com

     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. WORKAROUND

    Remove the entry for rpc.cmsd from /etc/inetd.conf and
    refresh inetd so that inetd will no longer run the program.  This
    can be done by running the following command:

    chsubserver -r inetd -C /etc/inetd.conf -d -v 'cmsd' -p 'udp'

    Any remaining instances of rpc.cmsd should be killed with
    the following command:

    ps -efl|grep [r]pc.cmsd|awk '{x = "kill " $4}{system(x)}'

    NOTE: Removing rpc.cmsd from /etc/inetd.conf will disable some
    functionality for all users.

V. OBTAINING FIXES

    AIX security fixes can be downloaded from:

        http://aix.software.ibm.com/aix/efixes/security
        or
        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://www.ibm.com/systems/support
 
    and click on the "My notifications" link.
 
    To view previously issued advisories, 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 obtain the PGP public key that can be used to communicate
    securely with the AIX Security Team you can either:
 
        A. Download the key from our web page:
 
  http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt
 
        B. Download the key from a PGP Public Key Server. The key ID is:
 
            0xADA6EB4D
 
    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

    This vulnerability was reported by Rodrigo Rubira Branco and
    iDefense Labs.

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

Internet Email: auscert@auscert.org.au
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