IBM SECURITY ADVISORY First Issued: Thu Feb 8 13:49:23 CST 2018 |Updated: Tue Feb 13 11:05:56 CST 2018 |Update: CVE description was updated to provide additional detail. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/aixbase_advisory.asc https://aix.software.ibm.com/aix/efixes/security/aixbase_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/aixbase_advisory.asc Security Bulletin: Vulnerability impacts AIX and VIOS (CVE-2018-1383) =============================================================================== SUMMARY: IBM has released the following fixes for AIX and VIOS in response to CVE-2018-1383. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2018-1383 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1383 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1383 | DESCRIPTION: A software logic bug creates a vulnerability in an AIX 6.1, | 7.1, and 7.2 daemon which could allow a user with root privileges on | one system, to obtain root access on another machine. CVSS Base Score: 9.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/138117 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 6.1, 7.1, 7.2 VIOS 2.2.x The vulnerabilities in the following filesets are being addressed: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- bos.cluster.rte 6.1.9.0 6.1.9.300 key_w_fs bos.cluster.rte 7.1.4.0 7.1.4.32 key_w_fs bos.cluster.rte 7.1.5.0 7.1.5.0 key_w_fs bos.cluster.rte 7.2.0.0 7.2.0.5 key_w_fs bos.cluster.rte 7.2.1.0 7.2.1.2 key_w_fs bos.cluster.rte 7.2.2.0 7.2.2.0 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.cluster.rte REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ------------------------------------------------ 6.1.9 IJ02726 ** SP11 key_w_apar 7.1.4 IJ02825 ** SP6 key_w_apar 7.1.5 IJ02727 ** SP2 key_w_apar 7.2.0 IJ02827 ** SP6 key_w_apar 7.2.1 IJ02828 ** SP4 key_w_apar 7.2.2 IJ02729 ** SP2 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IJ02726 http://www.ibm.com/support/docview.wss?uid=isg1IJ02727 http://www.ibm.com/support/docview.wss?uid=isg1IJ02729 http://www.ibm.com/support/docview.wss?uid=isg1IJ02825 http://www.ibm.com/support/docview.wss?uid=isg1IJ02827 http://www.ibm.com/support/docview.wss?uid=isg1IJ02828 https://www.ibm.com/support/docview.wss?uid=isg1IJ02726 https://www.ibm.com/support/docview.wss?uid=isg1IJ02727 https://www.ibm.com/support/docview.wss?uid=isg1IJ02729 https://www.ibm.com/support/docview.wss?uid=isg1IJ02825 https://www.ibm.com/support/docview.wss?uid=isg1IJ02827 https://www.ibm.com/support/docview.wss?uid=isg1IJ02828 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 AIX and VIOS fixes are available. The AIX/VIOS fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/aixbase_fix.tar http://aix.software.ibm.com/aix/efixes/security/aixbase_fix.tar https://aix.software.ibm.com/aix/efixes/security/aixbase_fix.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 ---------------------------------------------- 6.1.9.8 IJ02726s8a.171221.epkg.Z key_w_fix 6.1.9.9 IJ02726s9a.171221.epkg.Z key_w_fix 6.1.9.10 IJ02726sAa.171221.epkg.Z key_w_fix 7.1.4.3 IJ02825s3a.171221.epkg.Z key_w_fix 7.1.4.4 IJ02825s4a.171221.epkg.Z key_w_fix 7.1.4.5 IJ02825s5a.171221.epkg.Z key_w_fix 7.1.5.0 IJ02727s1a.171221.epkg.Z key_w_fix 7.1.5.1 IJ02727s1a.171221.epkg.Z key_w_fix 7.2.0.3 IJ02827s3a.171221.epkg.Z key_w_fix 7.2.0.4 IJ02827s4a.171221.epkg.Z key_w_fix 7.2.0.5 IJ02827s5a.171221.epkg.Z key_w_fix 7.2.1.1 IJ02828s1a.171221.epkg.Z key_w_fix 7.2.1.2 IJ02828s2a.171221.epkg.Z key_w_fix 7.2.1.3 IJ02828s3a.171221.epkg.Z key_w_fix 7.2.2.0 IJ02729s1a.171221.epkg.Z key_w_fix 7.2.2.1 IJ02729s1a.171221.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.2.1 is AIX 7200-02-01. VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 2.2.4.30 IJ02726s8a.171221.epkg.Z key_w_fix 2.2.4.40 IJ02726s9a.171221.epkg.Z key_w_fix 2.2.5.10 IJ02726s8a.171221.epkg.Z key_w_fix 2.2.5.20 IJ02726s9a.171221.epkg.Z key_w_fix 2.2.5.30 IJ02726s9a.171221.epkg.Z key_w_fix 2.2.6.0 IJ02726sAa.171221.epkg.Z key_w_fix 2.2.6.10 IJ02726sAa.171221.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf aixbase_fix.tar cd aixbase_fix Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 file" command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- 77a66084b51a448510fb01af2633b3b43589ae64df4e1a1407a0030e8699ddc0 IJ02726s8a.171221.epkg.Z key_w_csum 1e854be8068ad5b9ee4ddd30570144d9b14dcf37d2db574f9b4268345ac3a28b IJ02726s9a.171221.epkg.Z key_w_csum c6dd5ccdb979a9a17e7a4266e5c6e0af4b25281921f165276ad159401ff5aa86 IJ02726sAa.171221.epkg.Z key_w_csum d3422b3a86b68fc986078633ac00791115773e6a520ec939aa7d55dfe451ead4 IJ02727s1a.171221.epkg.Z key_w_csum 90cb1c39ac03158c924fc0785ca62f456d2cb454736507b1df0b6a71b83912e8 IJ02729s1a.171221.epkg.Z key_w_csum 663804ccb7ccb319a0da68ff157cc41de20e1df23c7cfa4375dcf036cfbf26b8 IJ02825s3a.171221.epkg.Z key_w_csum 040157614b623e8de55a066b8e1db82fa87af6cbfd4f9d1dbac0236c7aadc934 IJ02825s4a.171221.epkg.Z key_w_csum f33ef3d8441b0b1726df92be7027ba274c7e95eaa088bddc2f91ef3edef551a4 IJ02825s5a.171221.epkg.Z key_w_csum 6beca72bde8ad0da0634ca17e39e614e21e127e5960dd3ffef10af84a8c84685 IJ02827s3a.171221.epkg.Z key_w_csum dc47a6f5ec8f5530d77b288dd972f64945281b8637d207a7884fb1c7cea02093 IJ02827s4a.171221.epkg.Z key_w_csum 475cded7dbaf56e39937fe1418b9a09a6ebb3c66e161d49890f129f5c89830c9 IJ02827s5a.171221.epkg.Z key_w_csum 7beb4d34d7d0a7e46a899a66f610a5959b6eff35872a87aa1cf7d7d24bef9294 IJ02828s1a.171221.epkg.Z key_w_csum 07359a15361720147a7897acbe4757f6a0bb0ef1d027817f478146e6366e76bb IJ02828s2a.171221.epkg.Z key_w_csum 2683bfdc36327dd8cfbd49ad3f4521d3711cc3af49138314b8f7e4665b8ed4b7 IJ02828s3a.171221.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 Support at http://ibm.com/support/ and describe the discrepancy. openssl dgst -sha1 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file] openssl dgst -sha1 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file] Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/aixbase_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/aixbase_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/aixbase_advisory.asc.sig C. FIX AND INTERIM FIX INSTALLATION 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 Contact IBM Support for questions related to this announcement: http://ibm.com/support/ https://ibm.com/support/ 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 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 RELATED INFORMATION: IBM Secure Engineering Web Portal http://www.ibm.com/security/secure-engineering/bulletins.html IBM Product Security Incident Response Blog https://www.ibm.com/blogs/psirt/ Security Bulletin: Vulnerability impacts AIX and VIOS (CVE-2018-1383) http://www-01.ibm.com/support/docview.wss?uid=isg3T1026948 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Thu Feb 8 13:49:23 CST 2018 | Updated: Tue Feb 13 11:05:56 CST 2018 | Update: CVE description was updated to provide additional detail. =============================================================================== *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.