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AUSCERT External Security Bulletin Redistribution
ESB-2010.0656
A vulnerability has been identified in BIND
29 July 2010
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIND
Publisher: IBM
Operating System: AIX
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2009-4022
Reference: ESB-2009.1561
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/bind9_advisory.asc
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IBM SECURITY ADVISORY
First Issued: Mon Jul 26 18:42:09 CDT 2010
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/bind9_advisory.asc
VULNERABILITY SUMMARY
VULNERABILITY: Vulnerability with DNSSEC validation enabled in BIND
PLATFORMS: AIX 6.1 releases
SOLUTION: Apply the fix or workaround as described below.
THREAT: An attacker may be able to manipulate cache data and
perform DNS Cache Poisoning.
CERT VU Number: 418861
CVE Number: CVE-2009-4022
Reboot required? NO
Workarounds? YES
Protected by FPM? NO
Protected by SED? NO
DETAILED INFORMATION
I. DESCRIPTION
A nameserver with DNSSEC validation enabled may incorrectly add
records to its cache from the additional section of responses
received during resolution of a recursive client query. This
behavior only occurs when processing client queries with checking
disabled (CD) at the same time as requesting DNSSEC records (DO).
Please see the following for more information:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4022
http://www.kb.cert.org/vuls/id/418861
II. 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
------------------------------------------------
bos.net.tcp.client 6.1.2.0 6.1.2.6
bos.net.tcp.server 6.1.2.0 6.1.2.4
bos.net.tcp.client 6.1.3.0 6.1.3.3
bos.net.tcp.server 6.1.3.0 6.1.3.2
bos.net.tcp.client 6.1.4.0 6.1.4.2
bos.net.tcp.server 6.1.4.0 6.1.4.1
III. SOLUTION
A. FIXES
APARS are available for all supported releases.
B. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Service pack date
--------------------------------------------------------
6.1.2 IZ71774 4/21/10 sp7
6.1.3 IZ71667 4/21/10 sp4
6.1.4 IZ68597 2/12/10 sp3
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ71774
http://www.ibm.com/support/docview.wss?uid=isg1IZ71667
http://www.ibm.com/support/docview.wss?uid=isg1IZ68597
By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the service
pack when it becomes available.
IV. WORKAROUND
DNSSEC validation is disabled by default.
Users must never set "dnssec-enable yes" in /etc/named.conf file to
prevent this vulnerability.
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. Send an email with "get key" in the subject line to:
security-alert@austin.ibm.com
B. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt
C. 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.
VII. ACKNOWLEDGMENTS
ISC reported this vulnerability and was reported by
Michael Sinatra of UC Berkely.
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