IBM SECURITY ADVISORY First Issued: Sun Jan 29 01:19:56 CST 2017 |Updated: Wed Jul 26 12:40:04 CDT 2017 |Update 1: Changed impacted upper level fileset level for AIX 7.2.1 to | bos.net.tcp.client_core 7.2.1.0. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc https://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc ftp://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc Security Bulletin: Vulnerability in bellmail affects AIX (CVE-2017-1093) =============================================================================== SUMMARY: There is a vulnerability in bellmail that impacts AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2017-1093 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1093 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1093 DESCRIPTION: IBM AIX could allow a local user to exploit a vulnerability in the bellmail binary to gain root privileges. CVSS Base Score: 8.4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/120653 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 7.1.3.48 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 ------------------------------------------------ 6.1.9 IV92238 4/28/17 SP9 key_w_apar 7.1.3 IV92250 6/30/17 SP9 key_w_apar 7.1.4 IV92240 4/28/17 SP4 key_w_apar 7.2.0 IV92241 6/30/17 SP4 key_w_apar 7.2.1 IV92242 4/28/17 SP2 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV92238 http://www.ibm.com/support/docview.wss?uid=isg1IV92250 http://www.ibm.com/support/docview.wss?uid=isg1IV92240 http://www.ibm.com/support/docview.wss?uid=isg1IV92241 http://www.ibm.com/support/docview.wss?uid=isg1IV92242 https://www.ibm.com/support/docview.wss?uid=isg1IV92238 https://www.ibm.com/support/docview.wss?uid=isg1IV92250 https://www.ibm.com/support/docview.wss?uid=isg1IV92240 https://www.ibm.com/support/docview.wss?uid=isg1IV92241 https://www.ibm.com/support/docview.wss?uid=isg1IV92242 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/bellmail_fix2.tar http://aix.software.ibm.com/aix/efixes/security/bellmail_fix2.tar https://aix.software.ibm.com/aix/efixes/security/bellmail_fix2.tar The links above are to a tar file containing this signed advisory, interim fixes, and OpenSSL signatures for each interim fix. 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 IV92238m8a.170112.epkg.Z key_w_fix 6.1.9.7 IV92238m8a.170112.epkg.Z key_w_fix 6.1.9.8 IV92238m8a.170112.epkg.Z key_w_fix 7.1.3.5 IV92250m71.170112.epkg.Z key_w_fix 7.1.3.6 IV92250m71.170112.epkg.Z key_w_fix 7.1.3.7 IV92250m71.170112.epkg.Z key_w_fix 7.1.4.1 IV92240m3a.170112.epkg.Z key_w_fix 7.1.4.2 IV92240m3a.170112.epkg.Z key_w_fix 7.1.4.3 IV92240m3a.170112.epkg.Z key_w_fix 7.2.0.0 IV92241m2a.170112.epkg.Z key_w_fix 7.2.0.1 IV92241m2a.170112.epkg.Z key_w_fix 7.2.0.2 IV92241m2a.170112.epkg.Z key_w_fix 7.2.1.0 IV92242m1a.170112.epkg.Z key_w_fix 7.2.1.1 IV92242m1a.170112.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 2.2.3.x IV92238m8a.170112.epkg.Z key_w_fix 2.2.4.x IV92238m8a.170112.epkg.Z key_w_fix 2.2.5.x IV92238m8a.170112.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_fix2.tar cd bellmail_fix2 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 ----------------------------------------------------------------------------------------------------- 7b7e3d8c23dbca6c8424acdddbac4c889f9f15d7dffa8f7fca46db7ad83ce008 IV92238m8a.170112.epkg.Z key_w_csum 2307a711eeab2106418046c93402602163967a1395d963202f49316dcc1cb3d5 IV92250m71.170112.epkg.Z key_w_csum 60f04e1bdfdb7065e4cebfb235581219aaae80a8dfa692187f790cfef8893abc IV92240m3a.170112.epkg.Z key_w_csum 254af14aec94ee9b1589e9f7420ff6dc67af2d773fa5ee94920a4ef453ebb2c0 IV92241m2a.170112.epkg.Z key_w_csum 6b52bbbbc0af980a46e817e220d5bedfade19f2ff0db26d00d6761e3d2809a8c IV92242m1a.170112.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_advisory2.asc.sig https://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.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: Sun Jan 29 01:19:56 CST 2017 | Updated: Wed Jul 26 12:40:04 CDT 2017 | Update 1: Changed impacted upper level fileset level for AIX 7.2.1 to | bos.net.tcp.client_core 7.2.1.0. =============================================================================== *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.