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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2014.1419
Vulnerability in AIX bind
20 August 2014
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: bind
Publisher: IBM
Operating System: AIX
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2006-0987
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/bind9_advisory6.asc
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IBM SECURITY ADVISORY
First Issued: Fri Aug 15 14:07:52 CDT 2014
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/bind9_advisory6.asc
https://aix.software.ibm.com/aix/efixes/security/bind9_advisory6.asc
ftp://aix.software.ibm.com/aix/efixes/security/bind9_advisory6.asc
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: Vulnerability in AIX bind
PLATFORMS: AIX 5.3, 6.1, and 7.1 releases
VIOS 2.2.*
SOLUTION: Apply the fix as described below
THREAT: A remote attacker can cause denial of service
CVE Number: CVE-2006-0987 CVSS=5
Reboot required? NO
Workarounds? YES
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION (from cve.mitre.org)
The default configuration of ISC BIND before 9.4.1-P1, when configured as a
caching name server, allows recursive queries and provides additional
delegation information to arbitrary IP addresses, which allows remote
attackers to cause a denial of service (traffic amplification via DNS
queries with spoofed source IP addresses.
Please see following for more information:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0987
II. CVSS
CVSS Base Score: 5.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/25368 for the
current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
III. PLATFORM VULNERABILITY ASSESSMENT
Note: To use the following commands on VIOS you must first
execute:
oem_setup_env
To determine if your system is vulnerable, execute the following
command:
lslpp -L bos.net.tcp.server
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level KEY
----------------------------------------------------------
bos.net.tcp.server 5.3.12.0 5.3.12.6 key_w_fs
bos.net.tcp.server 6.1.7.0 6.1.7.20 key_w_fs
bos.net.tcp.server 6.1.8.0 6.1.8.17 key_w_fs
bos.net.tcp.server 6.1.9.0 6.1.9.15 key_w_fs
bos.net.tcp.server 7.1.1.0 7.1.1.20 key_w_fs
bos.net.tcp.server 7.1.2.0 7.1.2.17 key_w_fs
bos.net.tcp.server 7.1.3.0 7.1.3.15 key_w_fs
AIX Fileset (VIOS) Lower Level Upper Level
----------------------------------------------------------------
bos.rte.server 6.1.7.0(2.2.1.0) 6.1.7.20(2.2.1.8)
bos.rte.server 6.1.8.0(2.2.2.0) 6.1.8.17(2.2.2.4)
bos.rte.server 6.1.9.0(2.2.3.0) 6.1.9.3 (2.2.3.3)
IV. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability KEY
-------------------------------------------------------------
5.3.12 IV62327 ifix_only n/a key_w_apar
6.1.7 IV62224 ifix_only n/a key_w_apar
6.1.8 IV62146 12/31/2014 SP6 key_w_apar
6.1.9 IV62225 10/24/2014 SP4 key_w_apar
7.1.1 IV61093 ifix_only n/a key_w_apar
7.1.2 IV61090 12/31/2014 SP6 key_w_apar
7.1.3 IV61027 10/24/2014 SP4 key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV62327
http://www.ibm.com/support/docview.wss?uid=isg1IV62224
http://www.ibm.com/support/docview.wss?uid=isg1IV62146
http://www.ibm.com/support/docview.wss?uid=isg1IV62225
http://www.ibm.com/support/docview.wss?uid=isg1IV61093
http://www.ibm.com/support/docview.wss?uid=isg1IV61090
http://www.ibm.com/support/docview.wss?uid=isg1IV61027
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
from:
ftp://aix.software.ibm.com/aix/efixes/security/bind9_fix6.tar
The link above is to a tar file containing this signed
advisory, fix packages, and PGP 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 IV62327m9a.140709.epkg.Z key_w_fix
6.1.7.9 IV62224m9a.140709.epkg.Z key_w_fix
6.1.8.4 IV62146m4a.140709.epkg.Z key_w_fix
6.1.9.3 IV62225m3a.140708.epkg.Z key_w_fix
7.1.1.9 IV61093s9a.140603.epkg.Z key_w_fix
7.1.2.4 IV61090s4a.140603.epkg.Z key_w_fix
7.1.3.3 IV61027s3a.140611.epkg.Z key_w_fix
VIOS Level Interim Fix (*.Z)
-------------------------------------
2.2.1.8 IV62224m9a.140709.epkg.Z
2.2.2.4 IV62146m4a.140709.epkg.Z
2.2.3.3 IV62225m3a.140708.epkg.Z
To extract the fixes from the tar file:
tar xvf bind9_fix6.tar
cd bind9_fix6
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
----------------------------------------------------------------------------------------------------
169aadd86aab1edab49c90252ba4769699008179687457a07c89da0a63c76667 IV62327m9a.140709.epkg.Z key_w_csum
a0b4702fbe09127f5d7fec42d8dee93380802086913676ba740d3f6fda3dfbd9 IV62224m9a.140709.epkg.Z key_w_csum
1e75bddff7fccd357bd4af6da8adc62464f8c83e4aa613738cc307e842989f99 IV62146m4a.140709.epkg.Z key_w_csum
4d7a050115fa0b8a73f5531ddd1d156c5c0183d630948a78c20d7ca53199ee66 IV62225m3a.140708.epkg.Z key_w_csum
e512f9cc2e45038cb4d48acaadcad4c8d53b25df404d68e21dbdada67c350512 IV61093s9a.140603.epkg.Z key_w_csum
41b16daeecbc6633e5e40b542313394843cbca23c4775bf142220c3dd96b2ed7 IV61090s4a.140603.epkg.Z key_w_csum
0b5f7560b74e28a49ff13ccb11ef22ef913a5b3238d0e5bbc20632c953b0c7af IV61027s3a.140611.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>
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.
V. WORKAROUNDS (from kb.isc.org)
Adding these rules to named.conf to fix this vulnerability. The rules below
will allow recursive queries to local networks only.
acl "trusted" {
localhost;
localnets;
};
options {
...
allow-query { any; };
allow-recursion { trusted; };
allow-query-cache { trusted; };
...
};
VI. OBTAINING FIXES
AIX security fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security
AIX fixes can be downloaded from:
http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix
NOTE: Affected customers are urged to upgrade to the latest
applicable Technology Level and Service Pack.
VII. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit "My Notifications":
http://www.ibm.com/support/mynotifications
and click on the "My notifications" link.
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:
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_pgpkey.txt
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:
A. Send an email with "get key" in the subject line to:
security-alert@austin.ibm.com
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.
VIII. ACKNOWLEDGMENTS
This vulnerability was reported by Broadridge Financial.
IX. REFERENCES:
Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/
CVE-2006-0987: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0987
*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 Flash.
Note: 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.
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