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CentOS ProjectBIND_ADVISORY13.ASC

HistoryNov 18, 2016 - 8:19 a.m.

Vulnerabilities in BIND impact AIX,Vulnerabilities in BIND impact VIOS

2016-11-1808:19:36

CentOS Project

aix.software.ibm.com

568

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.8 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:N/I:N/A:C

0.973 High

EPSS

Percentile

99.8%

JSON

IBM SECURITY ADVISORY

First Issued: Fri Nov 18 08:19:36 CST 2016

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc
https://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc

Security Bulletin: Vulnerabilities in BIND impact AIX (CVE-2016-2776 and
CVE-2016-2775)

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

SUMMARY:

There are two vulnerabilities in BIND that impact AIX.

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

VULNERABILITY DETAILS:

CVEID: CVE-2016-2776 
https://vulners.com/cve/CVE-2016-2776
https://vulners.com/cve/CVE-2016-2776
DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an
    assertion failure in buffer.c while a nameserver is building responses
    to a specifically constructed request. By sending a specially crafted
    DNS packet, a remote attacker could exploit this vulnerability to make
    named exit unexpectedly with an assertion failure. 
CVSS Base Score: 7.5 
CVSS Temporal Score: See 
    https://exchange.xforce.ibmcloud.com/vulnerabilities/117246 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)

CVEID: CVE-2016-2775
https://vulners.com/cve/CVE-2016-2775
https://vulners.com/cve/CVE-2016-2775
DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an
    error when lwresd or the named lwres option is enabled. By sending
    an overly long request, a remote attacker could exploit this
    vulnerability to cause the daemon to crash.
CVSS Base Score: 7.5
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/115477 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
    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      6.1.9.200   key_w_fs
    bos.net.tcp.server      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.server      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.server      7.1.4.0      7.1.4.30    key_w_fs
    bos.net.tcp.bind_utils  7.2.0.0      7.2.0.1     key_w_fs
    bos.net.tcp.bind        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    IV90056  N/A           N/A  key_w_apar
        6.1.9     IV89828  4/28/17       SP9  key_w_apar
        7.1.3     IV89830  6/30/17       SP9  key_w_apar
        7.1.4     IV89829  4/28/17       SP4  key_w_apar
        7.2.0     IV89831  1/27/17       SP3  key_w_apar

        VIOS Level APAR     Availability  Release
        ------------------------------------------
        2.2.3      IV89828  6/30/17       2.2.3.90
        2.2.4      IV89828  6/30/17       2.2.4.40

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IV90056
        http://www.ibm.com/support/docview.wss?uid=isg1IV89828
        http://www.ibm.com/support/docview.wss?uid=isg1IV89830
        http://www.ibm.com/support/docview.wss?uid=isg1IV89829
        http://www.ibm.com/support/docview.wss?uid=isg1IV89831

        https://www.ibm.com/support/docview.wss?uid=isg1IV90056
        https://www.ibm.com/support/docview.wss?uid=isg1IV89828
        https://www.ibm.com/support/docview.wss?uid=isg1IV89830
        https://www.ibm.com/support/docview.wss?uid=isg1IV89829
        https://www.ibm.com/support/docview.wss?uid=isg1IV89831

        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_fix13.tar
        http://aix.software.ibm.com/aix/efixes/security/bind_fix13.tar
        https://aix.software.ibm.com/aix/efixes/security/bind_fix13.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   IV90056m9a.161020.epkg.Z  key_w_fix
        6.1.9.5    IV89828m5a.161017.epkg.Z  key_w_fix
        6.1.9.6    IV89828m6a.161013.epkg.Z  key_w_fix 
        6.1.9.7    IV89828m7a.161013.epkg.Z  key_w_fix
        7.1.3.5    IV89830m5a.161010.epkg.Z  key_w_fix
        7.1.3.6    IV89830m6d.161012.epkg.Z  key_w_fix
        7.1.3.7    IV89830m7a.161013.epkg.Z  key_w_fix
        7.1.4.0    IV89829m1a.161013.epkg.Z  key_w_fix 
        7.1.4.1    IV89829m1a.161013.epkg.Z  key_w_fix
        7.1.4.2    IV89829m2a.161010.epkg.Z  key_w_fix
        7.2.0.0    IV89831m1a.161017.epkg.Z  key_w_fix
        7.2.0.1    IV89831m1a.161017.epkg.Z  key_w_fix
        7.2.0.2    IV89831m2a.161018.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.

        VIOS Level  Interim Fix (*.Z)         KEY
        -----------------------------------------------
        2.2.3.70    IV89828m7a.161013.epkg.Z  key_w_fix
        2.2.4.2x    IV89828m7a.161013.epkg.Z  key_w_fix
        
        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_fix13.tar
        cd bind_fix13 

        Verify you have retrieved the fixes intact:

        The checksums below were generated using the
        "openssl dgst -sha256 &lt;filename&gt;" command as the following:

        openssl dgst -sha256                                              filename                 KEY
        -----------------------------------------------------------------------------------------------------
        d8429569f694cb01028ca64ca7a015429186f68446b56f1270889ae35ec1997f  IV89828m5a.161017.epkg.Z key_w_csum
        d30c22257611a99f9b7245afec9ef6aa40059fcc93f26e7dcffa2ab356436db2  IV89828m6a.161013.epkg.Z key_w_csum
        9e17c96c2130df27da3a78be4d39c6940d824352f20cf0ea43c088bd189a46c0  IV89828m7a.161013.epkg.Z key_w_csum
        e1cf3b152a9aa4e7d5e96f09b71a3b1eca8e70e7f163ca40c758aef0a8002c04  IV89829m1a.161013.epkg.Z key_w_csum
        838888c98f1c35a023d9f9337d47742abc190dba37ba26a71838ed6ad61ee1d4  IV89829m2a.161010.epkg.Z key_w_csum
        2bfc5500f33244a26bcf7406b80efdcfc75610db12527b7d8c3292c7d857c134  IV89830m5a.161010.epkg.Z key_w_csum
        e6924e936d92a22a94ce0e3b51945dd135b0423fdbf45bbf6d05305bf6ff2a52  IV89830m6d.161012.epkg.Z key_w_csum
        33054b9232f5c573dea6f869d2a7228a41764211036f5840adb766b9d3af9177  IV89830m7a.161013.epkg.Z key_w_csum
        d6b966d566e8e2d94e510774c2315ff751559c3f5352d2ba3cdbbec2aa61779f  IV89831m1a.161017.epkg.Z key_w_csum
        083aadd6c370c678818b320c88c6d8fd40d59e95b4f921c287ef6583649892bc  IV89831m2a.161018.epkg.Z key_w_csum
        55d7e325b63512056976f0cc951c7ebaf96b0f4703c5223f869ce42cb7af5d9c  IV90056m9a.161020.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
        [email protected] and describe the discrepancy.
       
        openssl dgst -sha1 -verify &lt;pubkey_file&gt; -signature &lt;advisory_file&gt;.sig &lt;advisory_file&gt;

        openssl dgst -sha1 -verify &lt;pubkey_file&gt; -signature &lt;ifix_file&gt;.sig &lt;ifix_file&gt;

        Published advisory OpenSSL signature file location:

        http://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory13.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.

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

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

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

    [email protected]

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: Fri Nov 18 08:19:36 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.