IBM SECURITY ADVISORY First Issued: Thu Dec 15 22:06:41 CST 2016 |Updated: Thu Dec 29 12:28:16 CST 2016 |Update: New iFixes provided for AIX 5.3.12.9, 6.1.9.6, 6.1.9.8, |7.1.4.1, 7.1.4.3, 7.2.0.0, 7.2.0.1, 7.2.0.2, 7.2.1.0, 7.2.1.1 |Updated: Wed Feb 8 16:52:50 CST 2017 |Update: New iFix provided for AIX 7.1.3.7 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/bind_advisory14.asc https://aix.software.ibm.com/aix/efixes/security/bind_advisory14.asc ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory14.asc Security Bulletin: Vulnerabilities in BIND impact AIX (CVE-2016-8864 and CVE-2016-2848) =============================================================================== SUMMARY: There are two vulnerabilities in BIND that impact AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2016-8864 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8864 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8864 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the improper handling of responses containing a DNAME answer in db.c or resolver.c. By sending a recursive response, 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/118526 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)) CVEID: CVE-2016-2848 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2848 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2848 DESCRIPTION: ISC BIND is vulnerable to a denial of service. By sending a specially crafted DNS packet with malformed options, 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/118228 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 7.2.0.2 key_w_fs | bos.net.tcp.client_core 7.2.1.0 7.2.1.0 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 IV91253 N/A N/A key_w_apar 6.1.9 IV91254 4/28/17 SP9 key_w_apar 7.1.3 IV91214 6/30/17 SP9 key_w_apar 7.1.4 IV91255 4/28/17 SP4 key_w_apar | 7.2.0 IV91256 6/30/17 SP4 key_w_apar | 7.2.1 IV91257 4/28/17 SP2 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV91254 http://www.ibm.com/support/docview.wss?uid=isg1IV91214 http://www.ibm.com/support/docview.wss?uid=isg1IV91255 http://www.ibm.com/support/docview.wss?uid=isg1IV91253 http://www.ibm.com/support/docview.wss?uid=isg1IV91256 http://www.ibm.com/support/docview.wss?uid=isg1IV91257 https://www.ibm.com/support/docview.wss?uid=isg1IV91254 https://www.ibm.com/support/docview.wss?uid=isg1IV91214 https://www.ibm.com/support/docview.wss?uid=isg1IV91255 https://www.ibm.com/support/docview.wss?uid=isg1IV91253 https://www.ibm.com/support/docview.wss?uid=isg1IV91256 https://www.ibm.com/support/docview.wss?uid=isg1IV91257 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_fix14.tar http://aix.software.ibm.com/aix/efixes/security/bind_fix14.tar https://aix.software.ibm.com/aix/efixes/security/bind_fix14.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 IV91253m9b.161209.epkg.Z key_w_fix | 6.1.9.6 IV91254m6b.161213.epkg.Z key_w_fix 6.1.9.7 IV91254m7b.161209.epkg.Z key_w_fix | 6.1.9.8 IV91254m8b.161209.epkg.z key_w_fix 7.1.3.4 IV91214m4b.161209.epkg.Z key_w_fix 7.1.3.5 IV91214m5b.161209.epkg.Z key_w_fix 7.1.3.6 IV91214m6a.161209.epkg.Z key_w_fix | 7.1.3.7 IV91214m7b.170202.epkg.Z key_w_fix | 7.1.4.1 IV91255m1b.161213.epkg.Z key_w_fix 7.1.4.2 IV91255m2a.161213.epkg.Z key_w_fix | 7.1.4.3 IV91255m3c.161213.epkg.Z key_w_fix | 7.2.0.0 IV91256m1b.161212.epkg.Z key_w_fix | 7.2.0.1 IV91256m1b.161212.epkg.Z key_w_fix | 7.2.0.2 IV91256m2b.161209.epkg.Z key_w_fix | 7.2.1.0 IV91257m0a.161212.epkg.Z key_w_fix | 7.2.1.1 IV91257m1a.161213.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_fix14.tar cd bind_fix14 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 " command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- fc27c599117b3c1b8ea3e74ce322c58d3477498c82a0c71d54d0972294debef5 IV91254m7b.161209.epkg.Z key_w_csum 73e94631a9b1ebd11859ca54b7658b1f6d26bea871a73bdc6c7c05049f34d1ac IV91214m4b.161209.epkg.Z key_w_csum 4673c6157b4a923d4ba516323b6ebd6657dbea0711daba60fb4a72ef7d553caa IV91214m5b.161209.epkg.Z key_w_csum 3230a4ba01323c2f913728e039b84c0dd2c347b43bfe2c46c84999bfdaa08607 IV91214m6a.161209.epkg.Z key_w_csum ac59f32afb0be85fcbc30fdc734232da24625fd0d0d630bd9f21189b5bcafee9 IV91255m2a.161213.epkg.Z key_w_csum 14660abd6992d2b688d42d7076505a844c7918b72f41932d865b2147154b7f49 IV91253m9b.161209.epkg.Z key_w_csum f557e8867ba671167862c00e6d482a3c831e2da26c8a47c456578b69432157e6 IV91254m6b.161213.epkg.Z key_w_csum 2a63c8b31b718e1be2c25b69396b56d3d1123fb2e681c3957124aed7da734500 IV91254m8b.161209.epkg.Z key_w_csum d07cffaeda6228d0bcf2fe162d00f1d47125ae6fe242c6be64985aca5cf2076e IV91255m1b.161213.epkg.Z key_w_csum 9f50019a890d5f6d9f3a20805c6d31a0044586ded0ec29ba0b58c2c1a6423dc7 IV91255m3c.161213.epkg.Z key_w_csum b890c8a3991ef8707f44aa243e4873d902145b9fdda3e0230924f86d2e3482b1 IV91256m1b.161212.epkg.Z key_w_csum 8c345a3c7c52dea528e74f910b54fad2d574ddc9e4d0beb1c45e3a19e50b793f IV91256m2b.161209.epkg.Z key_w_csum 4a3dd2f1e853912ff1d2394af0cc8f2a6a7f740057e4cae9c310b63011749165 IV91257m0a.161212.epkg.Z key_w_csum 42fd10502ced5ca407d90738098712ead3f2dbb7cf628f047125565baa35b832 IV91257m1a.161213.epkg.Z key_w_csum | 9d87ec797d34a045387601374ff18995a767da4949989b97da1d277be51a473f IV91214m7b.170202.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 Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/bind_advisory14.asc.sig https://aix.software.ibm.com/aix/efixes/security/bind_advisory14.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory14.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 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_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: Thu Dec 15 22:06:41 CST 2016 |Updated: Thu Dec 29 12:28:16 CST 2016 |Update: New iFixes provided for AIX 5.3.12.9, 6.1.9.6, 6.1.9.8, |7.1.4.1, 7.1.4.3, 7.2.0.0, 7.2.0.1, 7.2.0.2, 7.2.1.0, 7.2.1.1 |Updated: Wed Feb 8 16:52:50 CST 2017 |Update: New iFix provided for AIX 7.1.3.7 =============================================================================== *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.