Operating System:

[AIX]

Published:

12 November 2015

Protect yourself against future threats.

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

                               ESB-2015.2815
   Security Bulletin:  Vulnerability in bind affects AIX (CVE-2015-5722)
                             12 November 2015

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

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

Product:           bind
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-5722  

Reference:         ESB-2015.2473
                   ESB-2015.2332
                   ESB-2015.2306
                   ESB-2015.2302
                   ESB-2015.2301
                   ESB-2015.2300

Original Bulletin: 
   http://aix.software.ibm.com/aix/efixes/security/bind_advisory9.asc

- --------------------------BEGIN INCLUDED TEXT--------------------

IBM SECURITY ADVISORY

First Issued: Tues Nov 3 09:00:00 CDT 2015

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/bind_advisory9.asc
https://aix.software.ibm.com/aix/efixes/security/bind_advisory9.asc
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory9.asc


Security Bulletin:  Vulnerability in bind affects AIX (CVE-2015-5722)


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

SUMMARY:

    ISC BIND is vulnerable to a denial of service, caused by the exit of a
    validating resolver due to an assertion failure in buffer.c. By
    parsing a malformed DNSSEC key, a remote attacker could exploit this
    vulnerability to cause a denial of service.


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

VULNERABILITY DETAILS:

    CVEID: CVE-2015-5722
    DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the
        exit of a validating resolver due to an assertion failure in
        buffer.c. By parsing a malformed DNSSEC key, a remote attacker could
        exploit this vulnerability to cause a denial of service.
    CVSS Base Score: 7.5
    CVSS Temporal Score: See
        https://exchange.xforce.ibmcloud.com/vulnerabilities/106089 for the
        current score
    CVSS Environmental Score*: Undefined
    CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:C)


    AFFECTED PRODUCTS AND VERSIONS:

        AIX 5.3, 6.1, 7.1
        VIOS 2.2.x

        The following AIX fileset levels are vulnerable:

        AIX Fileset        Lower Level Upper Level KEY
        --------------------------------------------------------
        bos.net.tcp.client 5.3.12.0    5.3.12.10   key_w_fs
        bos.net.tcp.client 6.1.8.0     6.1.8.20    key_w_fs
        bos.net.tcp.client 6.1.9.0     6.1.9.45    key_w_fs
        bos.net.tcp.client 7.1.2.0     7.1.2.20    key_w_fs
        bos.net.tcp.client 7.1.3.0     7.1.3.45    key_w_fs

        AIX Fileset (VIOS)  Lower Level           Upper Level
        ------------------------------------------------------------
        bos.net.tcp.client  6.1.0.0(2.2.0.0)      6.1.8.20(2.2.2.70)
        bos.net.tcp.client  6.1.0.0(2.2.0.0)      6.1.9.45(2.2.3.50)

        Note:  to find out whether the affected filesets are installed
        on your systems, refer to the lslpp command found in AIX user's guide.

        Example:  lslpp -L | grep -i bos.net.tcp.client

    REMEDIATION:

        A. APARS

            IBM has assigned the following APARs to this problem:

            AIX Level APAR     Availability  SP   KEY
            ---------------------------------------------------
            5.3.12    IV78092  N/A                key_w_apar
            6.1.8     IV78096  N/A                key_w_apar
            6.1.9     IV78091  12/04/15      SP6  key_w_apar
            7.1.2     IV78094  N/A                key_w_apar
            7.1.3     IV78095  2/26/16       SP6  key_w_apar


            Subscribe to the APARs here:

            http://www.ibm.com/support/docview.wss?uid=isg1IV78091
            http://www.ibm.com/support/docview.wss?uid=isg1IV78095

            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 or http from:

            ftp://aix.software.ibm.com/aix/efixes/security/bind_fix9.tar
            http://aix.software.ibm.com/aix/efixes/security/bind_fix9.tar
            https://aix.software.ibm.com/aix/efixes/security/bind_fix9.tar

            The link above is to a tar file containing this signed
            advisory, fix packages, and OpenSSL 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)         KEY
            ------------------------------------------------
            5.3.12.9   IV78092m9a.151103.epkg.Z  key_w_fix
            6.1.8.7    IV78096m7a.151021.epkg.Z  key_w_fix
            6.1.9.5    IV78091m5a.151020.epkg.Z  key_w_fix
            7.1.2.7    IV78094m7a.151020.epkg.Z  key_w_fix
            7.1.3.5    IV78095m5a.151019.epkg.Z  key_w_fix

            VIOS Level  Interim Fix (*.Z)         KEY
            ------------------------------------------------
            2.2.2.70    IV78096m7a.151021.epkg.Z  key_w_fix
            2.2.3.50    IV78091m5a.151020.epkg.Z  key_w_fix


            To extract the fixes from the tar file:

            tar xvf bind_fix9.tar
            cd bind_fix9

            Verify you have retrieved the fixes intact:

            The checksums below were generated using the
            "openssl dgst -sha256 file" command as the followng:

            openssl dgst -sha256                                              filename                 KEY
            -----------------------------------------------------------------------------------------------------
            404c44a81b43cb8cacab75e732bc7c8eca27a869a137c619294fb3b91cf9f99c  IV78092m9a.151103.epkg.Z key_w_csum
            c2d3210404653dd91298efe732cb9b87ab0db9c6470f8c1ca540482b01690013  IV78096m7a.151021.epkg.Z key_w_csum
            95cb6237a23f136ae81f647d01f54a72c63594f8d8dcd4ff323523f096e01047  IV78091m5a.151020.epkg.Z key_w_csum
            8b10bce53ed6e225e29c8aa3663463d8320fe798c7b02740ba3b457ad294bb56  IV78094m7a.151020.epkg.Z key_w_csum
            ccc6e8abe8bf25e42fb08e4754f1b3e89d60c40bc73be4cec8a24af034c84c83  IV78095m5a.151019.epkg.Z key_w_csum

            These sums should match exactly. The OpenSSL 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.

            openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file>

            openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file>

            Published advisory OpenSSL signature file location:

            http://aix.software.ibm.com/aix/efixes/security/bind_advisory9.asc.sig
            https://aix.software.ibm.com/aix/efixes/security/bind_advisory9.asc.sig
            ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory9.asc.sig

        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.


    WORKAROUNDS AND MITIGATIONS:

        None.


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

CONTACT US:

    If you would like to receive AIX Security Advisories via email,
    please visit "My Notifications":

        http://www.ibm.com/support/mynotifications

    To view previously issued advisories, please visit:

        http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq

    Comments regarding the content of this announcement can be
    directed to:

        security-alert@austin.ibm.com

    To obtain the OpenSSL public key that can be used to verify the
    signed advisories and ifixes:

        Download the key from our web page:

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

    To obtain the PGP public key that can be used to communicate
    securely with the AIX Security Team via security-alert@austin.ibm.com you
    can either:

        A. Download the key from our web page:

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

        B. 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.


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


ACKNOWLEDGEMENTS:

    None


CHANGE HISTORY:

    First Issued: Tues Nov 3 09:00:00 CDT 2015


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

*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 Security Bulletin.

Disclaimer
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.

- --------------------------END INCLUDED TEXT--------------------

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