There is a vulnerability in BIND that impacts AIX.

IBM SECURITY ADVISORY

First Issued: Tue Mar 7 15:49:49 CST 2017
|Updated: Mon Oct 2 11:03:19 CDT 2017
|Update 1: Changed impacted fileset for AIX 7200-01.
| Changed from: bos.net.tcp.client_core
| to: bos.net.tcp.bind_utils 7.2.1.0-7.2.1.1.

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc
https://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc

Security Bulletin: Vulnerability in BIND impact AIX (CVE-2016-9131)

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

SUMMARY:

There is a vulnerability in BIND that impacts AIX.

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

VULNERABILITY DETAILS:

CVEID: CVE-2016-9131 
https://vulners.com/cve/CVE-2016-9131
https://vulners.com/cve/CVE-2016-9131
DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the
improper handling of responses during recursion. By sending a malformed 
response to a RTYPE ANY query, a remote attacker could exploit this 
vulnerability to trigger an assertion failure.
CVSS Base Score: 7.5 
CVSS Temporal Score: See 
    https://exchange.xforce.ibmcloud.com/vulnerabilities/120472 for the
    current score
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
    
    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.client         6.1.9.0      6.1.9.200   key_w_fs
    bos.net.tcp.client         7.1.3.0      7.1.3.48    key_w_fs
    bos.net.tcp.client         7.1.4.0      7.1.4.30    key_w_fs
    bos.net.tcp.client_core    7.2.0.0      7.2.0.3     key_w_fs

| bos.net.tcp.bind_utils 7.2.1.0 7.2.1.1 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    IV93366    **          N/A  key_w_apar
        6.1.9     IV93361    **          SP9  key_w_apar
        7.1.3     IV93362    **          SP9  key_w_apar
        7.1.4     IV93363    **          SP4  key_w_apar
        7.2.0     IV93403    **          SP4  key_w_apar
        7.2.1     IV93365    **          SP2  key_w_apar
        
        ** Please refer to AIX support lifecycle information page for 
        availability of Service Packs:
        http://www-01.ibm.com/support/docview.wss?uid=isg3T1012517

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IV93366
        http://www.ibm.com/support/docview.wss?uid=isg1IV93361
        http://www.ibm.com/support/docview.wss?uid=isg1IV93362 
        http://www.ibm.com/support/docview.wss?uid=isg1IV93363
        http://www.ibm.com/support/docview.wss?uid=isg1IV93403
        http://www.ibm.com/support/docview.wss?uid=isg1IV93365

        https://www.ibm.com/support/docview.wss?uid=isg1IV93366
        https://www.ibm.com/support/docview.wss?uid=isg1IV93361
        https://www.ibm.com/support/docview.wss?uid=isg1IV93362 
        https://www.ibm.com/support/docview.wss?uid=isg1IV93363
        https://www.ibm.com/support/docview.wss?uid=isg1IV93403
        https://www.ibm.com/support/docview.wss?uid=isg1IV93365

        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_fix15.tar
        http://aix.software.ibm.com/aix/efixes/security/bind_fix15.tar
        https://aix.software.ibm.com/aix/efixes/security/bind_fix15.tar

        The links above are 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   IV93366m9a.170215.epkg.Z  key_w_fix
        6.1.9.6    IV93361m8a.170215.epkg.Z  key_w_fix
        6.1.9.7    IV93361m8a.170215.epkg.Z  key_w_fix
        6.1.9.8    IV93361m8a.170215.epkg.Z  key_w_fix
        7.1.3.6    IV93362m8a.170215.epkg.Z  key_w_fix
        7.1.3.7    IV93362m8a.170215.epkg.Z  key_w_fix
        7.1.3.8    IV93362m8a.170215.epkg.Z  key_w_fix
        7.1.4.1    IV93363m3a.170215.epkg.Z  key_w_fix
        7.1.4.2    IV93363m3a.170215.epkg.Z  key_w_fix 
        7.1.4.3    IV93363m3a.170215.epkg.Z  key_w_fix
        7.2.0.1    IV93403m3a.170215.epkg.Z  key_w_fix
        7.2.0.2    IV93403m3a.170215.epkg.Z  key_w_fix
        7.2.0.3    IV93403m3a.170215.epkg.Z  key_w_fix
        7.2.1.0    IV93365m1a.170215.epkg.Z  key_w_fix
        7.2.1.1    IV93365m1a.170215.epkg.Z  key_w_fix

       

        Please note that the above table refers to AIX TL/SP level as
        opposed to fileset level, i.e., 7.1.3.5 is AIX 7100-03-05.

                   
        The above fixes are cumulative and address previously issued
        AIX BIND security bulletins with respect to SP and TL.           

        To extract the fixes from the tar file:

        tar xvf bind_fix15.tar
        cd bind_fix15 

        Verify you have retrieved the fixes intact:

        The checksums below were generated using the
        "openssl dgst -sha256 [filename]" command as the following:

        openssl dgst -sha256                                              filename                 KEY
        -----------------------------------------------------------------------------------------------------
        53f40b333c357a59ddd41dab42d8dcb0b8f2caf6ac4d10e1accac635eaf63230  IV93366m9a.170215.epkg.Z key_w_csum
        f3c62e3f3cf77d3ad49f7a253437fc1c07664f084a7e6cc9f2edfc434d43a20f  IV93361m8a.170215.epkg.Z key_w_csum
        70315bb6134e3e95423d7861de6ee1a1e2192b82b2d4ad3789aabe7879956f54  IV93362m8a.170215.epkg.Z key_w_csum
        2ee8b789c628a0d5aa52606fc6cf8ef695da8cadae3fc7065270eaa84b6b980c  IV93363m3a.170215.epkg.Z key_w_csum
        47f7846b5e7b21e12ea6f2d6a18d82192659306449b9be432eca9cba18f6dda2  IV93403m3a.170215.epkg.Z key_w_csum
        393ef4ed967efe3b08f39ad7f595e62f302db309dd6d78c3fec8b7ac983c6c68  IV93365m1a.170215.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 Support at
        http://ibm.com/support/ 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_advisory15.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory15.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
        https://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html

        To preview an interim fix installation:

        emgr -e epkg_name -p         # where epkg_name is the name of the
                                     # interim fix package being previewed.

        To install an interim fix package:

        emgr -e epkg_name -X         # where epkg_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
    https://www.ibm.com/support/mynotifications

To view previously issued advisories, please visit:

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

Contact IBM Support for questions related to this announcement:

    http://ibm.com/support/
    https://ibm.com/support/

   

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
https://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 [email protected] you
can either:

    A. Download the key from our web page:

http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
https://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
    https://www.first.org/cvss/user-guide

On-line Calculator v3:
    http://www.first.org/cvss/calculator/3.0
    https://www.first.org/cvss/calculator/3.0

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Tue Mar  7 15:49:49 CST 2017

| Updated: Mon Oct 2 11:03:19 CDT 2017
| Update 1: Changed impacted fileset for AIX 7200-01.
| Changed from: bos.net.tcp.client_core
| to: bos.net.tcp.bind_utils 7.2.1.0-7.2.1.1.

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

*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.