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CentOS ProjectBIND_ADVISORY11.ASC

HistoryApr 25, 2016 - 10:06 a.m.

Vulnerability in BIND affects AIX,Vulnerability in BIND affects VIOS

2016-04-2510:06:21

CentOS Project

aix.software.ibm.com

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.958 High

EPSS

Percentile

99.4%

JSON

IBM SECURITY ADVISORY

First Issued: Mon Apr 25 10:06:21 CDT 2016
|Updated: Wed Dec 6 10:17:27 CST 2017
|Update: Changed impacted fileset for AIX 7.2 from bos.net.tcp.client
| to bos.net.tcp.bind_utils.

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.bind_utils 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 
       
        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_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
        [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_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.

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

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:

    [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

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

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

| Updated: Wed Dec 6 10:17:27 CST 2017
| Update: Changed impacted fileset for AIX 7.2 from bos.net.tcp.client
| to bos.net.tcp.bind_utils.

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

*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.