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ESB-2016.0524 - [AIX] bind: Denial of service - Remote/unauthenticated

Date: 29 February 2016
References: ESB-2015.3145  ESB-2015.3146  ESB-2015.3157  ESB-2015.3159  ESB-2015.3166  ESB-2015.3183  ESB-2015.3207  ESB-2016.0222  ESB-2016.0532  

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

                               ESB-2016.0524
            Multiple vulnerabilities in IBM Java SDK affect AIX
                             29 February 2016

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

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

Product:           bind
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-8000  

Reference:         ESB-2016.0222
                   ESB-2015.3207
                   ESB-2015.3183
                   ESB-2015.3166
                   ESB-2015.3159
                   ESB-2015.3157
                   ESB-2015.3146
                   ESB-2015.3145

Original Bulletin: 
   http://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc

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

IBM SECURITY ADVISORY

First Issued: Thu Feb 25 09:58:38 CST 2016 

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc
https://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc


Security Bulletin:  Vulnerability in BIND affects AIX (CVE-2015-8000)


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

SUMMARY:

    There is a vulnerability in BIND that impacts AIX.


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

VULNERABILITY DETAILS:

    CVEID: CVE-2015-8000
    DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an 
        error in db.c when parsing incoming responses. A remote attacker could 
        exploit this vulnerability to trigger a REQUIRE assertion failure and 
        cause a denial of service.
    CVSS Base Score: 7.5
    CVSS Temporal Score: See
        https://exchange.xforce.ibmcloud.com/vulnerabilities/108948 for more
        information.
    CVSS Environmental Score*: Undefined
    CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
    

    AFFECTED PRODUCTS AND VERSIONS:
 
        AIX 5.3, 6.1, 7.1, 7.2
        VIOS 2.2.x

        The following fileset levels are vulnerable:
        
        key_fileset = 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.server  5.3.12.0     5.3.12.6    key_w_fs
        bos.net.tcp.client  6.1.9.0      6.1.9.101   key_w_fs
        bos.net.tcp.client  7.1.3.0      7.1.3.45    key_w_fs
        bos.net.tcp.client  7.1.4.0      7.1.4.0     key_w_fs
        bos.net.tcp.client  7.2.0.0      7.2.0.0     key_w_fs
        
        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    IV80187  N/A                key_w_apar
            6.1.9     IV80188  5/20/16       SP7  key_w_apar
            7.1.3     IV80189  8/24/16       SP7  key_w_apar
            7.1.4     IV80191  5/20/16       SP2  key_w_apar
            7.2.0     IV80192  5/20/16       SP2  key_w_apar

            Subscribe to the APARs here:

            http://www.ibm.com/support/docview.wss?uid=isg1IV80188
            http://www.ibm.com/support/docview.wss?uid=isg1IV80189
            http://www.ibm.com/support/docview.wss?uid=isg1IV80191
            http://www.ibm.com/support/docview.wss?uid=isg1IV80192

            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_fix10.tar
            http://aix.software.ibm.com/aix/efixes/security/bind_fix10.tar
            https://aix.software.ibm.com/aix/efixes/security/bind_fix10.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   IV80187m9a.160203.epkg.Z  key_w_fix
            6.1.9.6    IV80188s6a.160204.epkg.Z  key_w_fix
            7.1.3.5    IV80189m5a.160204.epkg.Z  key_w_fix
            7.1.4.1    IV80191s1a.160203.epkg.Z  key_w_fix
            7.2.0.1    IV80192s1a.160203.epkg.Z  key_w_fix
            
            VIOS Level  Interim Fix (*.Z)         KEY
            -----------------------------------------------
            2.2.4.0     IV80188s6a.160204.epkg.Z  key_w_fix 
            

            To extract the fixes from the tar file:

            tar xvf bind_fix10.tar
            cd bind_fix10

            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
            -----------------------------------------------------------------------------------------------------
            d4a20706824a25e28f82d93bc7560d68d41f82109ee313b65694827b9bc143ba  IV80187m9a.160203.epkg.Z key_w_csum
            c406a9e8c38ae6bcc7d9be89b6608cc408dfea923db7d11c482c2c3d7c11beea  IV80188s6a.160204.epkg.Z key_w_csum
            fe01e0b9d4564d29ac26bbfa0da3d1c0e51f848b6b94ea0d58e767cead9c792f  IV80189m5a.160204.epkg.Z key_w_csum
            4b085c6cbdc5bf716cf5202a2b0d6c3b9e918095991f9beafc611b8c22c61ee1  IV80191s1a.160203.epkg.Z key_w_csum
            19e153bc0d753f3c6f521bf87929eeef59d55e7e01e53977d37ff4d5a1bdedff  IV80192s1a.160203.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_advisory10.asc.sig
            https://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc.sig
            ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory10.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:

    Note: Keywords labeled as KEY in this document are used for parsing
    purposes.

    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 v3 Guide:  http://www.first.org/cvss/user-guide
    On-line Calculator v3:
        http://www.first.org/cvss/calculator/3.0


ACKNOWLEDGEMENTS:

    None 


CHANGE HISTORY:

    First Issued: Thu Feb 25 09:58:38 CST 2016 


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

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

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