Operating System:

[AIX]

Published:

14 September 2012

Protect yourself against future threats.

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

                               ESB-2012.0883
                          AIX NFSv4 vulnerability
                             14 September 2012

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

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

Product:           NFSv4
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Reduced Security -- Unknown/Unspecified
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-4817  

Original Bulletin: 
   http://aix.software.ibm.com/aix/efixes/security/nfsv4_advisory1.asc

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IBM SECURITY ADVISORY

First Issued: Thu Sept 13 13:43:29 CDT 2012

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/nfsv4_advisory1.asc

===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX NFSv4 vulnerability

PLATFORMS:       AIX 5.3, 6.1, and 7.1 releases

SOLUTION:        Apply the fix as described below.

THREAT:          See below

CVE Numbers:     CVE-2012-4817

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

===============================================================================
                           DETAILED INFORMATION

I. DESCRIPTION ( From cve.mitre.org)
   
    GID in NFSv4 is loosely enforced.

II. CVSS

    CVSS Base Score: 5 
    CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/78431 for the 
    current score 
    CVSS Environmental Score*: Undefined 
    CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:P) 

III. 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 bos.net.nfs.client

    The following fileset levels are vulnerable:

    AIX Fileset        Lower Level                Upper Level
    ------------------------------------------------------------------
    bos.net.nfs.client  5.3.12.0                  5.3.12.5
    bos.net.nfs.client  6.1.6.0                   6.1.6.17
    bos.net.nfs.client  6.1.7.0                   6.1.7.2
    bos.net.nfs.client  7.1.0.0                   7.1.0.20
    bos.net.nfs.client  7.1.1.0                   7.1.1.3

IV. SOLUTIONS

    A. APARS

        IBM has assigned the following APARs to this problem:

        AIX Level           APAR number        Availability
        ---------------------------------------------------
        5.3.12              IV17855            Available as of SP6
        6.1.6               IV10327            Available as of SP7
        6.1.7               IV11629            Available as of SP3 
        7.1.0               IV26436            12/12/12 sp8
        7.1.1               IV12169            Available as of SP4

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IV17855
        http://www.ibm.com/support/docview.wss?uid=isg1IV10327
        http://www.ibm.com/support/docview.wss?uid=isg1IV11629
        http://www.ibm.com/support/docview.wss?uid=isg1IV26436
        http://www.ibm.com/support/docview.wss?uid=isg1IV12169

        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/nfsv4_fix1.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 (*.Z)
        -------------------------------------------------------------------
        7.1.0.7                       IV26436s07.120907.epkg.Z 

        VIOS Level                    Interim Fix (*.Z)
        -------------------------------------------------------------------
        2.2.1.4-FP-25 SP-02           Included in current SP

        To extract the fixes from the tar file:

        tar xvf nfsv4_fix1.tar 
        cd nfsv4_fix1

        Verify you have retrieved the fixes intact:

        The checksums below were generated using the
        "csum -h SHA1" (sha1sum) command is the followng:

        csum -h SHA1 (sha1sum)                    filename
        ------------------------------------------------------------------
        8f42e3c1a5eb3a0d73d7be8d38265544f9abd866  IV26436s07.120907.epkg.Z

        To verify the sum, use the text of this advisory as input to 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 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; however, IBM does fully support them.

        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.

V. WORKAROUNDS

    There are no workarounds.

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

            security-alert@austin.ibm.com

        B. Download the key from our web page:

  http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt

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

            0x28BFAA12

    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.

VIII. REFERENCES:

    Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
    On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
    X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/78431
    CVE-2012-4817: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-4817

    *The CVSS Environment Score is customer environment specific and will
    ultimately impact the Overall CVSS Score. Customers can evaluate the
    impact of this vulnerability in their environments by accessing the links
    in the Reference section of this Flash.

    Note: According to the Forum of Incident Response and Security Teams
    (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
    open standard designed to convey vulnerability severity and help to
    determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
    "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
    RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
    VULNERABILITY.
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