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AUSCERT External Security Bulletin Redistribution
ESB-2009.1135
AIX named DNS BIND dynamic update denial of service
6 August 2009
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIND 9
Publisher: IBM
Operating System: AIX
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-0696
Reference: ASB-2009.1033
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/bind_advisory.asc
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IBM SECURITY ADVISORY
First Issued: Wed Aug 5 09:40:52 CDT 2009
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/bind_advisory.asc
or
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory.asc
VULNERABILITY SUMMARY
VULNERABILITY: AIX named DNS BIND dynamic update denial of service
PLATFORMS: AIX 5.3, 6.1
SOLUTION: Apply the fix as described below.
THREAT: A remote user can create a denial of service on AIX
DNS servers running BIND.
CERT VU Number: VU#725188
CVE Number: CVE-2009-0696
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
DETAILED INFORMATION
I. DESCRIPTION
AIX 'named' is an implementation of BIND (Berkeley Internet Name
Domain) providing server functionality for the Domain Name System
(DNS) Protocol. AIX currently ships and supports three versions
of BIND: 4, 8, and 9.
There is an error in the handling of dynamic update messages in
BIND 9. A crafted update packet from a remote user can cause a
master server to assert and exit. Please see the following for
more information:
https://www.isc.org/node/474
The successful exploitation of this vulnerability allows a remote,
unauthenticated user to make a master DNS server assert and exit.
The following command is vulnerable:
/usr/sbin/named9
II. PLATFORM VULNERABILITY ASSESSMENT
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
---------------------------------------------------
bos.net.tcp.server 5.3.7.0 5.3.7.7
bos.net.tcp.server 5.3.8.0 5.3.8.5
bos.net.tcp.server 5.3.9.0 5.3.9.1
bos.net.tcp.server 5.3.10.0 5.3.10.0
bos.net.tcp.server 6.1.0.0 6.1.0.8
bos.net.tcp.server 6.1.1.0 6.1.1.5
bos.net.tcp.server 6.1.2.0 6.1.2.2
bos.net.tcp.server 6.1.3.0 6.1.3.0
III. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
----------------------------------------------------
5.3.7 IZ56311 11/11/2009
5.3.8 IZ56312 11/11/2009
5.3.9 IZ56313 11/11/2009
5.3.10 IZ56314 11/11/2009
6.1.0 IZ56315 9/23/2009
6.1.1 IZ56316 9/23/2009
6.1.2 IZ56317 9/23/2009
6.1.3 IZ56318 9/23/2009
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ56311
http://www.ibm.com/support/docview.wss?uid=isg1IZ56312
http://www.ibm.com/support/docview.wss?uid=isg1IZ56313
http://www.ibm.com/support/docview.wss?uid=isg1IZ56314
http://www.ibm.com/support/docview.wss?uid=isg1IZ56315
http://www.ibm.com/support/docview.wss?uid=isg1IZ56316
http://www.ibm.com/support/docview.wss?uid=isg1IZ56317
http://www.ibm.com/support/docview.wss?uid=isg1IZ56318
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 now available. The fixes can be downloaded from:
http://aix.software.ibm.com/aix/efixes/security/bind_fix.tar
ftp://aix.software.ibm.com/aix/efixes/security/bind_fix.tar
The links above are to a tar file containing this signed
advisory, fix packages, and PGP signatures for each package.
AIX Level Fix
----------------------------------------------------
5.3.7 IZ56311_07.090804.epkg.Z
5.3.8 IZ56312_08.090804.epkg.Z
5.3.9 IZ56313_09.090804.epkg.Z
5.3.10 IZ56314_10.090804.epkg.Z
6.1.0 IZ56315_00.090804.epkg.Z
6.1.1 IZ56316_01.090804.epkg.Z
6.1.2 IZ56317_02.090804.epkg.Z
6.1.3 IZ56318_03.090804.epkg.Z
To extract the fixes from the tar file:
tar xvf bind_fix.tar
cd bind_fix
Verify you have retrieved the fixes intact:
The checksums below were generated using the "csum -h SHA1"
(sha1sum) commands and are as follows:
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
3cd61d918a55f1ca90ccf177afb63bff3448eb84 IZ56311_07.090804.epkg.Z
01b6e1853a7dab425d439215f4a57bd281e7429c IZ56312_08.090804.epkg.Z
486b25f723071d474670a09d36109719b2ff0438 IZ56313_09.090804.epkg.Z
7c5e0bcb37697ae2f8ebf53cce1ea9af51856659 IZ56314_10.090804.epkg.Z
8841942df04ff441ae5bd79e140b203d8c2000be IZ56315_00.090804.epkg.Z
a1ca4ca9b7c9e1d8bbe68c75eebae56b0b8d4953 IZ56316_01.090804.epkg.Z
57dda1a9ed719fc36f8f09e34b93940f188a6482 IZ56317_02.090804.epkg.Z
3710d457c0304e99b1b3ed70fd120b6247cc45c2 IZ56318_03.090804.epkg.Z
To verify the sums, use the text of this advisory as input to
csum or sha1sum. For example:
csum -h SHA1 -i Advisory.asc
sha1sum -c Advisory.asc
These sums should match exactly. The PGP 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 and describe the
discrepancy at the following address:
security-alert@austin.ibm.com
C. 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.
Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; thus, IBM does not warrant the fully
correct functionality of an interim fix.
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.
IMPORTANT: The fix will not take affect until any running BIND
servers have been stopped and restarted with the following
commands:
stopsrc -s named
startsrc -s named
IV. WORKAROUNDS
There are no workarounds.
V. OBTAINING FIXES
AIX security fixes can be downloaded from:
http://aix.software.ibm.com/aix/efixes/security
or
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.
VI. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit:
http://www.ibm.com/systems/support
and click on the "My notifications" link.
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
Comments regarding the content of this announcement can be
directed to:
security-alert@austin.ibm.com
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:
A. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt
B. Download the key from a PGP Public Key Server. The key ID is:
0xADA6EB4D
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.
VII. ACKNOWLEDGMENTS
This vulnerability was reported by Matthias Urlichs, Tom Daly, and
Internet Systems Consortium.
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