IBM SECURITY ADVISORY First Issued: Fri Aug 15 14:07:52 CDT 2014 |Updated: Fri Aug 22 10:29:06 CDT 2014 |Update: VIOS fileset names updated 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.net.tcp.server 6.1.7.0(2.2.1.0) 6.1.7.20(2.2.1.8) | bos.net.tcp.server 6.1.8.0(2.2.2.0) 6.1.8.17(2.2.2.4) | bos.net.tcp.server 6.1.9.0(2.2.3.0) 6.1.9.15(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 -signature .sig openssl dgst -sha1 -verify -signature .sig 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.