IBM SECURITY ADVISORY First Issued: Thu Dec 15 15:12:23 CST 2016 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/bellmail_advisory.asc https://aix.software.ibm.com/aix/efixes/security/bellmail_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/bellmail_advisory.asc Security Bulletin: Vulnerability in bellmail affects AIX (CVE-2016-8972) =============================================================================== SUMMARY: There is a vulnerability in bellmail that impacts AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2016-8972 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8972 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8972 DESCRIPTION: IBM AIX could allow a local user to gain root privileges using a specially crafted command within the bellmail client. CVSS Base Score: 8.4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/118863 for more information. CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 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 6.1.9.0 6.1.9.200 key_w_fs bos.net.tcp.client 7.1.3.0 7.1.3.47 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 7.2.0.1 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 ------------------------------------------------ 6.1.9 IV91006 4/28/17 SP9 key_w_apar 7.1.3 IV91007 6/30/17 SP9 key_w_apar 7.1.4 IV91008 4/28/17 SP4 key_w_apar 7.2.0 IV91010 6/30/17 SP4 key_w_apar 7.2.1 IV91011 4/28/17 SP2 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV91006 http://www.ibm.com/support/docview.wss?uid=isg1IV91007 http://www.ibm.com/support/docview.wss?uid=isg1IV91008 http://www.ibm.com/support/docview.wss?uid=isg1IV91010 http://www.ibm.com/support/docview.wss?uid=isg1IV91011 https://www.ibm.com/support/docview.wss?uid=isg1IV91006 https://www.ibm.com/support/docview.wss?uid=isg1IV91007 https://www.ibm.com/support/docview.wss?uid=isg1IV91008 https://www.ibm.com/support/docview.wss?uid=isg1IV91010 https://www.ibm.com/support/docview.wss?uid=isg1IV91011 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. A system reboot is recommended after installing the iFixes. The fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/bellmail_fix.tar http://aix.software.ibm.com/aix/efixes/security/bellmail_fix.tar https://aix.software.ibm.com/aix/efixes/security/bellmail_fix.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 ---------------------------------------------- 6.1.9.6 IV91006s8a.161125.epkg.Z key_w_fix 6.1.9.7 IV91006s8a.161125.epkg.Z key_w_fix 6.1.9.8 IV91006s8a.161125.epkg.Z key_w_fix 7.1.3.5 IV91007s7a.161125.epkg.Z key_w_fix 7.1.3.6 IV91007s7a.161125.epkg.Z key_w_fix 7.1.3.7 IV91007s7a.161125.epkg.Z key_w_fix 7.1.4.1 IV91008s3a.161125.epkg.Z key_w_fix 7.1.4.2 IV91008s3a.161125.epkg.Z key_w_fix 7.1.4.3 IV91008s3a.161125.epkg.Z key_w_fix 7.2.0.0 IV91010s2a.161125.epkg.Z key_w_fix 7.2.0.1 IV91010s2a.161125.epkg.Z key_w_fix 7.2.0.2 IV91010s2a.161125.epkg.Z key_w_fix 7.2.1.0 IV91011s1a.161125.epkg.Z key_w_fix 7.2.1.1 IV91011s1a.161125.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 2.2.3.x IV91006s8a.161125.epkg.Z key_w_fix 2.2.4.x IV91006s8a.161125.epkg.Z key_w_fix 2.2.5.x IV91006s8a.161125.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.1.4.1 is AIX 7100-04-01. To extract the fixes from the tar file: tar xvf bellmail_fix.tar cd bellmail_fix 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 ----------------------------------------------------------------------------------------------------- a70228565213804918e890f90dd63f43f46bd0f057a214c504efc32b2294feb9 IV91006s8a.161125.epkg.Z key_w_csum b52b3bb1950ae58efe1c2c1c3e691bab21a6823cc8c732dde373024b4e6a7fdc IV91007s7a.161125.epkg.Z key_w_csum cfacfdff0bcc211368afc746851f2d36f8d071b758d1b8c419d844255dee5442 IV91008s3a.161125.epkg.Z key_w_csum d23f90920fedf449706685b8fa2659dcc93715448e3be29abbd6a3b7a38e8232 IV91010s2a.161125.epkg.Z key_w_csum 80bc674128c8ad49616259335277a86acc29dac9d30fd0222c997522d7a00fe4 IV91011s1a.161125.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/bellmail_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/bellmail_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/bellmail_advisory.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: Vulnerability research and notification provided by Rhino Security Labs. CHANGE HISTORY: First Issued: Thu Dec 15 15:12:23 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.