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AUSCERT External Security Bulletin Redistribution
ESB-2016.2761
Vulnerabilities in BIND impact AIX
21 November 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-2016-2776 CVE-2016-2775
Reference: ESB-2016.2568
ESB-2016.2535
ESB-2016.2485
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc
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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
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2776
https://cve.mitre.org/cgi-bin/cvename.cgi?name=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
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2775
https://cve.mitre.org/cgi-bin/cvename.cgi?name=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 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
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 <filename>" 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
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_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.
===============================================================================
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
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
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 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
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.
- --------------------------END INCLUDED TEXT--------------------
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