IBM SECURITY ADVISORY First Issued: Thu Feb 25 09:58:38 CST 2016 |Updated: Wed Dec 6 10:17:27 CST 2017 |Update: Changed the impacted fileset for AIX 7.2 from bos.net.tcp.client | to bos.net.tcp.bind_utils. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc https://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc Security Bulletin: Vulnerability in BIND affects AIX (CVE-2015-8000) =============================================================================== SUMMARY: There is a vulnerability in BIND that impacts AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2015-8000 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an error in db.c when parsing incoming responses. A remote attacker could exploit this vulnerability to trigger a REQUIRE assertion failure and cause a denial of service. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/108948 for more information. 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 VIOS 2.2.x 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.server 5.3.12.0 5.3.12.6 key_w_fs bos.net.tcp.client 6.1.9.0 6.1.9.101 key_w_fs bos.net.tcp.client 7.1.3.0 7.1.3.46 key_w_fs bos.net.tcp.client 7.1.4.0 7.1.4.0 key_w_fs | bos.net.tcp.bind_utils 7.2.0.0 7.2.0.0 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 IV80187 N/A key_w_apar 6.1.9 IV80188 5/20/16 SP7 key_w_apar 7.1.3 IV80189 8/24/16 SP7 key_w_apar 7.1.4 IV80191 5/20/16 SP2 key_w_apar 7.2.0 IV80192 5/20/16 SP2 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV80188 http://www.ibm.com/support/docview.wss?uid=isg1IV80189 http://www.ibm.com/support/docview.wss?uid=isg1IV80191 http://www.ibm.com/support/docview.wss?uid=isg1IV80192 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_fix10.tar http://aix.software.ibm.com/aix/efixes/security/bind_fix10.tar https://aix.software.ibm.com/aix/efixes/security/bind_fix10.tar The link above is 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 IV80187m9a.160203.epkg.Z key_w_fix 6.1.9.6 IV80188s6a.160204.epkg.Z key_w_fix 7.1.3.5 IV80189m5a.160204.epkg.Z key_w_fix 7.1.4.1 IV80191s1a.160203.epkg.Z key_w_fix 7.2.0.1 IV80192s1a.160203.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 2.2.4.0 IV80188s6a.160204.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf bind_fix10.tar cd bind_fix10 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 ----------------------------------------------------------------------------------------------------- d4a20706824a25e28f82d93bc7560d68d41f82109ee313b65694827b9bc143ba IV80187m9a.160203.epkg.Z key_w_csum c406a9e8c38ae6bcc7d9be89b6608cc408dfea923db7d11c482c2c3d7c11beea IV80188s6a.160204.epkg.Z key_w_csum fe01e0b9d4564d29ac26bbfa0da3d1c0e51f848b6b94ea0d58e767cead9c792f IV80189m5a.160204.epkg.Z key_w_csum 4b085c6cbdc5bf716cf5202a2b0d6c3b9e918095991f9beafc611b8c22c61ee1 IV80191s1a.160203.epkg.Z key_w_csum 19e153bc0d753f3c6f521bf87929eeef59d55e7e01e53977d37ff4d5a1bdedff IV80192s1a.160203.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_advisory10.asc.sig https://aix.software.ibm.com/aix/efixes/security/bind_advisory10.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory10.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 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. 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 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_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 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 On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 ACKNOWLEDGEMENTS: None CHANGE HISTORY: First Issued: Thu Feb 25 09:58:38 CST 2016 Updated: Tue Mar 1 09:10:59 CST 2016 Update: Modified the impacted upper level filesets for 7.1.3 | Updated: Wed Dec 6 10:17:27 CST 2017 | Update: Changed the impacted fileset for AIX 7.2 from bos.net.tcp.client | to bos.net.tcp.bind_utils. =============================================================================== *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.