IBM SECURITY ADVISORY

First Issued: Tue Oct 23 10:13:27 CDT 2012
| Updated: Mon Jan 28 12:29:56 CDT 2013
| Update: New ifixes for the latest SP’s
| Updated: Thu Dec 12 12:55:11 CST 2013
| Update: 1. Added KEYs for parsing purposes
| 2. Moved to OpenSSL signature

http://aix.software.ibm.com/aix/efixes/security/bind9_advisory5.asc
ftp://aix.software.ibm.com/aix/efixes/security/bind9_advisory5.asc

                       VULNERABILITY SUMMARY

VULNERABILITY: Vulnerability in AIX bind

PLATFORMS: AIX 5.3 Service Extension, 6.1, and 7.1 releases

SOLUTION: Apply the fix as described below

THREAT: A remote attacker can cause denial of service

CVE Number: CVE-2012-5166 CVSS=7.8

Reboot required? NO
Workarounds? YES
Protected by FPM? NO
Protected by SED? NO

                       DETAILED INFORMATION

I. DESCRIPTION (from cve.mitre.org)

If specific combinations of RDATA are loaded into a nameserver, either 
via cache or an authoritative zone, a subsequent query for a related 
record will cause named to lock up. 

Please see the following for more information:

https://vulners.com/cve/CVE-2012-5166

II. CVSS

CVSS Base Score: 7.8
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/79121 for the
current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:C)

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.client bos.net.tcp.server

The following fileset levels are vulnerable:

AIX Fileset        Lower Level       Upper Level  KEY
----------------------------------------------------------
bos.net.tcp.client  5.3.12.0          5.3.12.7    key_w_fs
bos.net.tcp.server  5.3.12.0          5.3.12.4    key_w_fs

| bos.net.tcp.client 6.1.6.0 6.1.6.21 key_w_fs
| bos.net.tcp.server 6.1.6.0 6.1.6.20 key_w_fs
| bos.net.tcp.client 6.1.7.0 6.1.7.17 key_w_fs
| bos.net.tcp.server 6.1.7.0 6.1.7.17 key_w_fs
| bos.net.tcp.client 7.1.0.0 7.1.0.22 key_w_fs
bos.net.tcp.server 7.1.0.0 7.1.0.19 key_w_fs
| bos.net.tcp.client 7.1.1.0 7.1.1.17 key_w_fs
| bos.net.tcp.server 7.1.1.0 7.1.1.17 key_w_fs

IV. SOLUTIONS

A. APARS

    IBM has assigned the following APARs to this problem:

    AIX Level  APAR      Availability  SP     KEY
    ---------------------------------------------------
    5.3.12     IV30368   Available     sp7    key_w_apar

| 6.1.6 IV30364 03/29/13 sp11 key_w_apar
| 6.1.7 IV30365 03/29/13 sp7 key_w_apar
| 6.1.8 IV30247 Available sp1 key_w_apar
| 7.1.0 IV30366 05/02/13 sp9 key_w_apar
| 7.1.1 IV30367 05/02/13 sp7 key_w_apar
| 7.1.2 IV30185 Available sp1 key_w_apar

    Subscribe to the APARs here:

    http://www.ibm.com/support/docview.wss?uid=isg1IV30368
    http://www.ibm.com/support/docview.wss?uid=isg1IV30364
    http://www.ibm.com/support/docview.wss?uid=isg1IV30365

| http://www.ibm.com/support/docview.wss?uid=isg1IV30247
http://www.ibm.com/support/docview.wss?uid=isg1IV30366
http://www.ibm.com/support/docview.wss?uid=isg1IV30367
| http://www.ibm.com/support/docview.wss?uid=isg1IV30185

    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_fix5.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
    -------------------------------------------------------------------
    5.3.12.6    IV30368s06.121016.epkg.Z   key_w_fix      
    6.1.6.9     IV30364s09.121016.epkg.Z   key_w_fix

| 6.1.6.10 IV30364s10.130121.epkg.Z key_w_fix
6.1.7.5 IV30365s05.121016.epkg.Z key_w_fix
| 6.1.7.6 IV30365s06.130121.epkg.Z key_w_fix
7.1.0.7 IV30366s07.121016.epkg.Z key_w_fix
| 7.1.0.8 IV30366s08.130121.epkg.Z key_w_fix
7.1.1.5 IV30367s05.121016.epkg.Z key_w_fix
| 7.1.1.6 IV30367s06.130121.epkg.Z key_w_fix

    VIOS Level                    Interim Fix (*.Z)
    -------------------------------------------------------------------
    2.2.1.4-FP-25 SP-02           IV30365s04.121018.epkg.Z

    To extract the fixes from the tar file:

    tar xvf bind9_fix5.tar
    cd bind9_fix5

    Verify you have retrieved the fixes intact:

    The checksums below were generated using the
    "csum -h SHA1" (sha1sum) command is the followng:

    csum -h SHA1 (sha1sum)                    filename
    ------------------------------------------------------------------
    76c1615c13fb9e8ce77c1e2cc3cdfc7f4e3f2ce9  IV30368s06.121016.epkg.Z
    69095160bf88dd4a764333bc31c26de5bf980c82  IV30364s09.121016.epkg.Z

| bf817930a0a569cb984496ca1d62e49b2ff24e6e IV30364s10.130121.epkg.Z
1a03d512c5f6f53813c7d679681327dbaf991fbf IV30365s05.121016.epkg.Z
| 5c137843e8d31ecb9cbbb8bc8ff3390f16eb6ea0 IV30365s06.130121.epkg.Z
0dcac920553a9bd0e34484519ab3a6e4f80fdf83 IV30366s07.121016.epkg.Z
| de70daa2f7692cae7d59f8cfec542e0b87cf0f0b IV30366s08.130121.epkg.Z
b3ae50663c8866bbc1c0cead2871347c86afc52e IV30367s05.121016.epkg.Z
| 6181646c89f48b20680e2c5df3a8974c7c4dbb42 IV30367s06.130121.epkg.Z
c59ba4b6cb6144c53881cea8fd3ba84250f62997 IV30365s04.121018.epkg.Z

    To verify the sum, use the text of this advisory as input to sha1sum.
    For example:

    csum -h SHA1 -i Advisory.asc
    sha1sum -c Advisory.asc

    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 AIX_PSIRT_pub.asc -signature file.asc.sig file.asc

 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)

Setting the option 'minimal-responses' to 'yes' will prevent the lockup.

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:

    http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd

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 request 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:

        [email protected]

    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.

eServer is a trademark of International Business Machines
Corporation.  IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation.  All other trademarks
are property of their respective holders.

VIII. REFERENCES:

Note: Keywords labeled as KEY in this document are used for parsing purposes.

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/79121
CVE-2012-5166: https://vulners.com/cve/CVE-2012-5166

*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.