IBM SECURITY ADVISORY First Issued: Tue Mar 7 15:49:49 CST 2017 |Updated: Mon Oct 2 11:03:19 CDT 2017 |Update 1: Changed impacted fileset for AIX 7200-01. | Changed from: bos.net.tcp.client_core | to: bos.net.tcp.bind_utils 7.2.1.0-7.2.1.1. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc https://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc Security Bulletin: Vulnerability in BIND impact AIX (CVE-2016-9131) =============================================================================== SUMMARY: There is a vulnerability in BIND that impacts AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2016-9131 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9131 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9131 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the improper handling of responses during recursion. By sending a malformed response to a RTYPE ANY query, a remote attacker could exploit this vulnerability to trigger an assertion failure. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/120472 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 5.3, 6.1, 7.1, 7.2 The following fileset levels are vulnerable: key_fileset = aix Fileset Lower Level Upper Level KEY ------------------------------------------------------------ bos.net.tcp.client 5.3.12.0 5.3.12.10 key_w_fs bos.net.tcp.client 6.1.9.0 6.1.9.200 key_w_fs bos.net.tcp.client 7.1.3.0 7.1.3.48 key_w_fs bos.net.tcp.client 7.1.4.0 7.1.4.30 key_w_fs bos.net.tcp.client_core 7.2.0.0 7.2.0.3 key_w_fs | bos.net.tcp.bind_utils 7.2.1.0 7.2.1.1 key_w_fs Note: To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide. Example: lslpp -L | grep -i bos.net.tcp.client REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ------------------------------------------------ 5.3.12 IV93366 ** N/A key_w_apar 6.1.9 IV93361 ** SP9 key_w_apar 7.1.3 IV93362 ** SP9 key_w_apar 7.1.4 IV93363 ** SP4 key_w_apar 7.2.0 IV93403 ** SP4 key_w_apar 7.2.1 IV93365 ** SP2 key_w_apar ** Please refer to AIX support lifecycle information page for availability of Service Packs: http://www-01.ibm.com/support/docview.wss?uid=isg3T1012517 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV93366 http://www.ibm.com/support/docview.wss?uid=isg1IV93361 http://www.ibm.com/support/docview.wss?uid=isg1IV93362 http://www.ibm.com/support/docview.wss?uid=isg1IV93363 http://www.ibm.com/support/docview.wss?uid=isg1IV93403 http://www.ibm.com/support/docview.wss?uid=isg1IV93365 https://www.ibm.com/support/docview.wss?uid=isg1IV93366 https://www.ibm.com/support/docview.wss?uid=isg1IV93361 https://www.ibm.com/support/docview.wss?uid=isg1IV93362 https://www.ibm.com/support/docview.wss?uid=isg1IV93363 https://www.ibm.com/support/docview.wss?uid=isg1IV93403 https://www.ibm.com/support/docview.wss?uid=isg1IV93365 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 or http from: ftp://aix.software.ibm.com/aix/efixes/security/bind_fix15.tar http://aix.software.ibm.com/aix/efixes/security/bind_fix15.tar https://aix.software.ibm.com/aix/efixes/security/bind_fix15.tar The links above are 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 ---------------------------------------------- 5.3.12.9 IV93366m9a.170215.epkg.Z key_w_fix 6.1.9.6 IV93361m8a.170215.epkg.Z key_w_fix 6.1.9.7 IV93361m8a.170215.epkg.Z key_w_fix 6.1.9.8 IV93361m8a.170215.epkg.Z key_w_fix 7.1.3.6 IV93362m8a.170215.epkg.Z key_w_fix 7.1.3.7 IV93362m8a.170215.epkg.Z key_w_fix 7.1.3.8 IV93362m8a.170215.epkg.Z key_w_fix 7.1.4.1 IV93363m3a.170215.epkg.Z key_w_fix 7.1.4.2 IV93363m3a.170215.epkg.Z key_w_fix 7.1.4.3 IV93363m3a.170215.epkg.Z key_w_fix 7.2.0.1 IV93403m3a.170215.epkg.Z key_w_fix 7.2.0.2 IV93403m3a.170215.epkg.Z key_w_fix 7.2.0.3 IV93403m3a.170215.epkg.Z key_w_fix 7.2.1.0 IV93365m1a.170215.epkg.Z key_w_fix 7.2.1.1 IV93365m1a.170215.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.1.3.5 is AIX 7100-03-05. The above fixes are cumulative and address previously issued AIX BIND security bulletins with respect to SP and TL. To extract the fixes from the tar file: tar xvf bind_fix15.tar cd bind_fix15 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 [filename]" command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- 53f40b333c357a59ddd41dab42d8dcb0b8f2caf6ac4d10e1accac635eaf63230 IV93366m9a.170215.epkg.Z key_w_csum f3c62e3f3cf77d3ad49f7a253437fc1c07664f084a7e6cc9f2edfc434d43a20f IV93361m8a.170215.epkg.Z key_w_csum 70315bb6134e3e95423d7861de6ee1a1e2192b82b2d4ad3789aabe7879956f54 IV93362m8a.170215.epkg.Z key_w_csum 2ee8b789c628a0d5aa52606fc6cf8ef695da8cadae3fc7065270eaa84b6b980c IV93363m3a.170215.epkg.Z key_w_csum 47f7846b5e7b21e12ea6f2d6a18d82192659306449b9be432eca9cba18f6dda2 IV93403m3a.170215.epkg.Z key_w_csum 393ef4ed967efe3b08f39ad7f595e62f302db309dd6d78c3fec8b7ac983c6c68 IV93365m1a.170215.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 Support at http://ibm.com/support/ and describe the discrepancy. openssl dgst -sha1 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file] openssl dgst -sha1 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file] Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc.sig https://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory15.asc.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 https://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html To preview an interim fix installation: emgr -e epkg_name -p # where epkg_name is the name of the # interim fix package being previewed. To install an interim fix package: emgr -e epkg_name -X # where epkg_name is the name of the # interim fix package being installed. WORKAROUNDS AND MITIGATIONS: None. =============================================================================== CONTACT US: Note: Keywords labeled as KEY in this document are used for parsing purposes. If you would like to receive AIX Security Advisories via email, please visit "My Notifications": http://www.ibm.com/support/mynotifications https://www.ibm.com/support/mynotifications To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq https://www14.software.ibm.com/webapp/set2/subscriptions/onvdq Contact IBM Support for questions related to this announcement: http://ibm.com/support/ https://ibm.com/support/ 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 https://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt To obtain the PGP public key that can be used to communicate securely with the AIX Security Team via security-alert@austin.ibm.com you can either: A. Download the key from our web page: http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt https://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt 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. REFERENCES: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide https://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 https://www.first.org/cvss/calculator/3.0 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Mar 7 15:49:49 CST 2017 | Updated: Mon Oct 2 11:03:19 CDT 2017 | Update 1: Changed impacted fileset for AIX 7200-01. | Changed from: bos.net.tcp.client_core | to: bos.net.tcp.bind_utils 7.2.1.0-7.2.1.1. =============================================================================== *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 Security Bulletin. Disclaimer 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.