IBM SECURITY ADVISORY First Issued: Fri Nov 18 08:19:36 CST 2016 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc https://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc Security Bulletin: Vulnerabilities in BIND impact AIX (CVE-2016-2776 and CVE-2016-2775) =============================================================================== SUMMARY: There are two vulnerabilities in BIND that impact AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2016-2776 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2776 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2776 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an assertion failure in buffer.c while a nameserver is building responses to a specifically constructed request. By sending a specially crafted DNS packet, a remote attacker could exploit this vulnerability to make named exit unexpectedly with an assertion failure. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/117246 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-2016-2775 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2775 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2775 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an error when lwresd or the named lwres option is enabled. By sending an overly long request, a remote attacker could exploit this vulnerability to cause the daemon to crash. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/115477 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 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 6.1.9.200 key_w_fs bos.net.tcp.server 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.server 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.server 7.1.4.0 7.1.4.30 key_w_fs bos.net.tcp.bind_utils 7.2.0.0 7.2.0.1 key_w_fs bos.net.tcp.bind 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 IV90056 N/A N/A key_w_apar 6.1.9 IV89828 4/28/17 SP9 key_w_apar 7.1.3 IV89830 6/30/17 SP9 key_w_apar 7.1.4 IV89829 4/28/17 SP4 key_w_apar 7.2.0 IV89831 1/27/17 SP3 key_w_apar VIOS Level APAR Availability Release ------------------------------------------ 2.2.3 IV89828 6/30/17 2.2.3.90 2.2.4 IV89828 6/30/17 2.2.4.40 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV90056 http://www.ibm.com/support/docview.wss?uid=isg1IV89828 http://www.ibm.com/support/docview.wss?uid=isg1IV89830 http://www.ibm.com/support/docview.wss?uid=isg1IV89829 http://www.ibm.com/support/docview.wss?uid=isg1IV89831 https://www.ibm.com/support/docview.wss?uid=isg1IV90056 https://www.ibm.com/support/docview.wss?uid=isg1IV89828 https://www.ibm.com/support/docview.wss?uid=isg1IV89830 https://www.ibm.com/support/docview.wss?uid=isg1IV89829 https://www.ibm.com/support/docview.wss?uid=isg1IV89831 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_fix13.tar http://aix.software.ibm.com/aix/efixes/security/bind_fix13.tar https://aix.software.ibm.com/aix/efixes/security/bind_fix13.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 IV90056m9a.161020.epkg.Z key_w_fix 6.1.9.5 IV89828m5a.161017.epkg.Z key_w_fix 6.1.9.6 IV89828m6a.161013.epkg.Z key_w_fix 6.1.9.7 IV89828m7a.161013.epkg.Z key_w_fix 7.1.3.5 IV89830m5a.161010.epkg.Z key_w_fix 7.1.3.6 IV89830m6d.161012.epkg.Z key_w_fix 7.1.3.7 IV89830m7a.161013.epkg.Z key_w_fix 7.1.4.0 IV89829m1a.161013.epkg.Z key_w_fix 7.1.4.1 IV89829m1a.161013.epkg.Z key_w_fix 7.1.4.2 IV89829m2a.161010.epkg.Z key_w_fix 7.2.0.0 IV89831m1a.161017.epkg.Z key_w_fix 7.2.0.1 IV89831m1a.161017.epkg.Z key_w_fix 7.2.0.2 IV89831m2a.161018.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. VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 2.2.3.70 IV89828m7a.161013.epkg.Z key_w_fix 2.2.4.2x IV89828m7a.161013.epkg.Z key_w_fix 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_fix13.tar cd bind_fix13 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 ----------------------------------------------------------------------------------------------------- d8429569f694cb01028ca64ca7a015429186f68446b56f1270889ae35ec1997f IV89828m5a.161017.epkg.Z key_w_csum d30c22257611a99f9b7245afec9ef6aa40059fcc93f26e7dcffa2ab356436db2 IV89828m6a.161013.epkg.Z key_w_csum 9e17c96c2130df27da3a78be4d39c6940d824352f20cf0ea43c088bd189a46c0 IV89828m7a.161013.epkg.Z key_w_csum e1cf3b152a9aa4e7d5e96f09b71a3b1eca8e70e7f163ca40c758aef0a8002c04 IV89829m1a.161013.epkg.Z key_w_csum 838888c98f1c35a023d9f9337d47742abc190dba37ba26a71838ed6ad61ee1d4 IV89829m2a.161010.epkg.Z key_w_csum 2bfc5500f33244a26bcf7406b80efdcfc75610db12527b7d8c3292c7d857c134 IV89830m5a.161010.epkg.Z key_w_csum e6924e936d92a22a94ce0e3b51945dd135b0423fdbf45bbf6d05305bf6ff2a52 IV89830m6d.161012.epkg.Z key_w_csum 33054b9232f5c573dea6f869d2a7228a41764211036f5840adb766b9d3af9177 IV89830m7a.161013.epkg.Z key_w_csum d6b966d566e8e2d94e510774c2315ff751559c3f5352d2ba3cdbbec2aa61779f IV89831m1a.161017.epkg.Z key_w_csum 083aadd6c370c678818b320c88c6d8fd40d59e95b4f921c287ef6583649892bc IV89831m2a.161018.epkg.Z key_w_csum 55d7e325b63512056976f0cc951c7ebaf96b0f4703c5223f869ce42cb7af5d9c IV90056m9a.161020.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_advisory13.asc.sig https://aix.software.ibm.com/aix/efixes/security/bind_advisory13.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory13.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: Fri Nov 18 08:19:36 CST 2016 =============================================================================== *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.