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             AUSCERT External Security Bulletin Redistribution

                               ESB-2010.0656
                A vulnerability has been identified in BIND
                               29 July 2010

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

Product:           BIND
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2009-4022  

Reference:         ESB-2009.1561

Original Bulletin: 
   http://aix.software.ibm.com/aix/efixes/security/bind9_advisory.asc

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IBM SECURITY ADVISORY

First Issued: Mon Jul 26 18:42:09 CDT 2010

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/bind9_advisory.asc

                           VULNERABILITY SUMMARY

VULNERABILITY:   Vulnerability with DNSSEC validation enabled in BIND

PLATFORMS:       AIX 6.1 releases

SOLUTION:        Apply the fix or workaround as described below.

THREAT:		 An attacker may be able to manipulate cache data and
                 perform DNS Cache Poisoning.

CERT VU Number:  418861
CVE Number:      CVE-2009-4022

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

                           DETAILED INFORMATION

I. DESCRIPTION 

    A nameserver with DNSSEC validation enabled may  incorrectly add
    records to its cache from the additional section of responses 
    received during resolution of a recursive client query. This 
    behavior only occurs when processing client queries with checking
    disabled (CD) at the same time as requesting DNSSEC records (DO).

    Please see the following for more information:
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4022
    http://www.kb.cert.org/vuls/id/418861

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 bos.net.tcp.client bos.net.tcp.server

    The following fileset levels are vulnerable:

    AIX Fileset        Lower Level       Upper Level
    ------------------------------------------------
    bos.net.tcp.client	  6.1.2.0	 6.1.2.6
    bos.net.tcp.server	  6.1.2.0	 6.1.2.4
    bos.net.tcp.client	  6.1.3.0	 6.1.3.3
    bos.net.tcp.server	  6.1.3.0	 6.1.3.2
    bos.net.tcp.client	  6.1.4.0	 6.1.4.2
    bos.net.tcp.server	  6.1.4.0	 6.1.4.1

III. SOLUTION

    A. FIXES

	APARS are available for all supported releases.

    B. APARS

        IBM has assigned the following APARs to this problem:

        AIX Level           APAR number        Service pack date
        --------------------------------------------------------
        6.1.2               IZ71774            4/21/10 sp7
        6.1.3               IZ71667            4/21/10 sp4
        6.1.4               IZ68597            2/12/10 sp3


        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IZ71774
        http://www.ibm.com/support/docview.wss?uid=isg1IZ71667
        http://www.ibm.com/support/docview.wss?uid=isg1IZ68597

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

IV. WORKAROUND

    DNSSEC validation is disabled by default.
    Users must never set "dnssec-enable yes" in /etc/named.conf file to
    prevent this vulnerability. 

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

    ISC reported this vulnerability and was reported by 
    Michael Sinatra of UC Berkely.

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