-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (AIX) iD8DBQFMTzjN4fmd+Ci/qhIRAqkfAJ4vcz1M+JKm10C+5mov0zOAQLbCyQCgn1zK HZNDmgXLmmPTSUj8PTq5y54= =eC8n -----END PGP SIGNATURE-----