IBM SECURITY ADVISORY First Issued: Mon Apr 25 10:06:21 CDT 2016 |Updated: Wed Dec 6 10:17:27 CST 2017 |Update: Changed 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_advisory11.asc https://aix.software.ibm.com/aix/efixes/security/bind_advisory11.asc ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory11.asc Security Bulletin: Vulnerability in BIND affects AIX (CVE-2015-8704) =============================================================================== SUMMARY: There is a vulnerability in BIND that impacts AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2015-8704 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by improper bounds checking in apl_42.c. By sending specially crafted Address Prefix List (APL) data, a remote authenticated attacker could exploit this vulnerability to trigger an INSIST assertion failure and cause the named process to terminate. CVSS Base Score: 6.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/109701 for more information. CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/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 IV81278 N/A key_w_apar 6.1.9 IV81279 5/20/16 SP7 key_w_apar 7.1.3 IV81280 9/01/16 SP7 key_w_apar 7.1.4 IV81281 5/20/16 SP2 key_w_apar 7.2.0 IV81282 5/20/16 SP2 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV81279 http://www.ibm.com/support/docview.wss?uid=isg1IV81280 http://www.ibm.com/support/docview.wss?uid=isg1IV81281 http://www.ibm.com/support/docview.wss?uid=isg1IV81282 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_fix11.tar http://aix.software.ibm.com/aix/efixes/security/bind_fix11.tar https://aix.software.ibm.com/aix/efixes/security/bind_fix11.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 IV81278m9a.160315.epkg.Z key_w_fix 6.1.9.4 IV81279m4c.160331.epkg.Z key_w_fix 6.1.9.5 IV81279m5a.160329.epkg.Z key_w_fix 6.1.9.6 IV81279s6a.160308.epkg.Z key_w_fix 7.1.3.4 IV81280m4b.160329.epkg.Z key_w_fix 7.1.3.5 IV81280m5a.160330.epkg.Z key_w_fix 7.1.3.6 IV81280m6a.160315.epkg.Z key_w_fix 7.1.4.0 IV81281m0b.160331.epkg.Z key_w_fix 7.1.4.1 IV81281m1a.160315.epkg.Z key_w_fix 7.2.0.0 IV81282m0a.160401.epkg.Z key_w_fix 7.2.0.1 IV81282m1a.160315.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 2.2.3.4 IV81279m4c.160331.epkg.Z key_w_fix 2.2.3.50 IV81279m5a.160329.epkg.Z key_w_fix 2.2.4.0 IV81279s6a.160308.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_fix11.tar cd bind_fix11 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 ----------------------------------------------------------------------------------------------------- 44161375e82ea83e5e19351965548d307bc2d60d00b7c287f038761919388f41 IV81278m9a.160315.epkg.Z key_w_csum df1a64da89157f6b02343cccb7f8ff602ddf35556b6bfb931b945bf54fb4f570 IV81279m4c.160331.epkg.Z key_w_csum 7b3b8d9ab180693c5277614cf1cc38b1014b6d5e10d0664b6c61fab6edc86348 IV81279m5a.160329.epkg.Z key_w_csum 27461bf81b05058b04916794c1c0ece24e9293ea19412e782a40194d7c8f4e20 IV81279s6a.160308.epkg.Z key_w_csum 48ec4b131395e08d4268cda52b951706477d1fd5f899313fbc1eb94b01520cae IV81280m4b.160329.epkg.Z key_w_csum 0ed91605553a853d608751e37483e69816905bf01bd9257f3637ddb55a7a6811 IV81280m5a.160330.epkg.Z key_w_csum 69e9abd767737a1581ecd4097e3b9bb529933dcd343e12952ede1119816a43ac IV81280m6a.160315.epkg.Z key_w_csum c1e6a2d85d08b2e10ea56c498df28ac8ccca78998ce04fbab13d24e1c96c7d1d IV81281m0b.160331.epkg.Z key_w_csum e5a3942ed985da1412a63a7eeab36bf9a46dc0268601c6d6c9932f590da008dd IV81281m1a.160315.epkg.Z key_w_csum a863b7e6118fd61530dcc18abff4c5f2c6b45673db9545131c90bd345f2cff4f IV81282m0a.160401.epkg.Z key_w_csum c9167f7317e4888eb01c49d244192e66972a630340048896d807d0b52e8e0757 IV81282m1a.160315.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_advisory11.asc.sig https://aix.software.ibm.com/aix/efixes/security/bind_advisory11.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory11.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: First Issued: Mon Apr 25 10:06:21 CDT 2016 | Updated: Wed Dec 6 10:17:27 CST 2017 | Update: Changed 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.