IBM SECURITY ADVISORY

First Issued: Mon Apr 25 10:06:21 CDT 2016 

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/bind_advisory11.asc
https://aix.software.ibm.com/aix/efixes/security/bind_advisory11.asc
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory11.asc


Security Bulletin:  Vulnerability in BIND affects AIX (CVE-2015-8704)


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

SUMMARY:

    There is a vulnerability in BIND that impacts AIX.


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

VULNERABILITY DETAILS:

    CVEID: CVE-2015-8704
    DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by
        improper bounds checking in apl_42.c. By sending specially crafted
        Address Prefix List (APL) data, a remote authenticated attacker could
        exploit this vulnerability to trigger an INSIST assertion failure and
        cause the named process to terminate. 
    CVSS Base Score: 6.5
    CVSS Temporal Score: See
        https://exchange.xforce.ibmcloud.com/vulnerabilities/109701 for more
        information.
    CVSS Environmental Score*: Undefined
    CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/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      7.1.3.46    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    IV81278  N/A                key_w_apar
            6.1.9     IV81279  5/20/16       SP7  key_w_apar
            7.1.3     IV81280  9/01/16       SP7  key_w_apar
            7.1.4     IV81281  5/20/16       SP2  key_w_apar
            7.2.0     IV81282  5/20/16       SP2  key_w_apar

            Subscribe to the APARs here:

            http://www.ibm.com/support/docview.wss?uid=isg1IV81279
            http://www.ibm.com/support/docview.wss?uid=isg1IV81280
            http://www.ibm.com/support/docview.wss?uid=isg1IV81281
            http://www.ibm.com/support/docview.wss?uid=isg1IV81282

            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_fix11.tar
            http://aix.software.ibm.com/aix/efixes/security/bind_fix11.tar
            https://aix.software.ibm.com/aix/efixes/security/bind_fix11.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   IV81278m9a.160315.epkg.Z  key_w_fix
            6.1.9.4    IV81279m4c.160331.epkg.Z  key_w_fix
            6.1.9.5    IV81279m5a.160329.epkg.Z  key_w_fix
            6.1.9.6    IV81279s6a.160308.epkg.Z  key_w_fix
            7.1.3.4    IV81280m4b.160329.epkg.Z  key_w_fix
            7.1.3.5    IV81280m5a.160330.epkg.Z  key_w_fix
            7.1.3.6    IV81280m6a.160315.epkg.Z  key_w_fix
            7.1.4.0    IV81281m0b.160331.epkg.Z  key_w_fix
            7.1.4.1    IV81281m1a.160315.epkg.Z  key_w_fix
            7.2.0.0    IV81282m0a.160401.epkg.Z  key_w_fix
            7.2.0.1    IV81282m1a.160315.epkg.Z  key_w_fix
            
            VIOS Level  Interim Fix (*.Z)         KEY
            -----------------------------------------------
            2.2.3.4     IV81279m4c.160331.epkg.Z  key_w_fix
            2.2.3.50    IV81279m5a.160329.epkg.Z  key_w_fix
            2.2.4.0     IV81279s6a.160308.epkg.Z  key_w_fix 
            

            To extract the fixes from the tar file:

            tar xvf bind_fix11.tar
            cd bind_fix11

            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
            ------------------------------------------------------------
            -----------------------------------------
            44161375e82ea83e5e19351965548d307bc2d60d00b7c287f038761919388f41  
            IV81278m9a.160315.epkg.Z key_w_csum
            df1a64da89157f6b02343cccb7f8ff602ddf35556b6bfb931b945bf54fb4f570  
            IV81279m4c.160331.epkg.Z key_w_csum
            7b3b8d9ab180693c5277614cf1cc38b1014b6d5e10d0664b6c61fab6edc86348  
            IV81279m5a.160329.epkg.Z key_w_csum
            27461bf81b05058b04916794c1c0ece24e9293ea19412e782a40194d7c8f4e20  
            IV81279s6a.160308.epkg.Z key_w_csum
            48ec4b131395e08d4268cda52b951706477d1fd5f899313fbc1eb94b01520cae  
            IV81280m4b.160329.epkg.Z key_w_csum
            0ed91605553a853d608751e37483e69816905bf01bd9257f3637ddb55a7a6811  
            IV81280m5a.160330.epkg.Z key_w_csum 
            69e9abd767737a1581ecd4097e3b9bb529933dcd343e12952ede1119816a43ac  
            IV81280m6a.160315.epkg.Z key_w_csum
            c1e6a2d85d08b2e10ea56c498df28ac8ccca78998ce04fbab13d24e1c96c7d1d  
            IV81281m0b.160331.epkg.Z key_w_csum
            e5a3942ed985da1412a63a7eeab36bf9a46dc0268601c6d6c9932f590da008dd  
            IV81281m1a.160315.epkg.Z key_w_csum
            a863b7e6118fd61530dcc18abff4c5f2c6b45673db9545131c90bd345f2cff4f  
            IV81282m0a.160401.epkg.Z key_w_csum
            c9167f7317e4888eb01c49d244192e66972a630340048896d807d0b52e8e0757  
            IV81282m1a.160315.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  -signature
.sig 
 
            openssl dgst -sha1 -verify  -signature .sig


            Published advisory OpenSSL signature file location:
 
           
http://aix.software.ibm.com/aix/efixes/security/bind_advisory11.asc.sig
           
https://aix.software.ibm.com/aix/efixes/security/bind_advisory11.asc.sig
           
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory11.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
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    Comments regarding the content of this announcement can be
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        security-alert@austin.ibm.com

    To obtain the OpenSSL public key that can be used to verify the
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        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: Mon Apr 25 10:06:21 CDT 2016