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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1940 Vulnerability in rmsock affects AIX (CVE-2018-1655) 4 July 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: rmsock Publisher: IBM Operating System: AIX Impact/Access: Access Privileged Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-1655 Original Bulletin: http://www.ibm.com/support/docview.wss?uid=isg3T1027880 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in rmsock affects AIX (CVE-2018-1655) Security Bulletin Document information Software version: 5.3, 6.1, 7.1, 7.2 Operating system(s): AIX Reference #: T1027880 Modified date: 02 July 2018 Summary There is a vulnerability in the rmsock command that affects AIX. Vulnerability Details CVEID: CVE-2018-1655 DESCRIPTION: IBM AIX contains a vulnerability in the rmsock command that may be used to expose kernel memory. CVSS Base Score: 4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 144748 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) Affected Products and Versions AIX 5.3, 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.net.tcp.client 5.3.12.0 5.3.12.10 key_w_fs bos.net.tcp.client 6.1.9.0 6.1.9.315 key_w_fs bos.net.tcp.client 7.1.4.0 7.1.4.33 key_w_fs bos.net.tcp.client 7.1.5.0 7.1.5.15 key_w_fs bos.net.tcp.client_core 7.2.0.0 7.2.0.5 key_w_fs bos.net.tcp.client_core 7.2.1.0 7.2.1.3 key_w_fs bos.net.tcp.client_core 7.2.2.0 7.2.2.16 key_w_fs 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 Note: AIX or VIOS users of all fileset levels should continue to monitor their My Notifications alerts and the IBM PSIRT Blog for additional information about these vulnerabilities: - - My Notifications http://www.ibm.com/support/mynotifications Remediation/Fixes A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY - ------------------------------------------------ 5.3.12 IJ06935 ** N/A key_w_apar 6.1.9 IJ06905 ** SP12 key_w_apar 7.1.4 IJ06906 ** SP7 key_w_apar 7.1.5 IJ06904 ** SP3 key_w_apar 7.2.0 IJ06934 ** N/A key_w_apar 7.2.1 IJ06907 ** SP5 key_w_apar 7.2.2 IJ06908 ** SP3 key_w_apar VIOS Level APAR Availability SP KEY - ---------------------------------------------------- 2.2.4 IJ06905 ** N/A key_w_apar 2.2.5 IJ06905 ** 2.2.5.50 key_w_apar 2.2.6 IJ06905 ** 2.2.6.30 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IJ06904 http://www.ibm.com/support/docview.wss?uid=isg1IJ06905 http://www.ibm.com/support/docview.wss?uid=isg1IJ06906 http://www.ibm.com/support/docview.wss?uid=isg1IJ06907 http://www.ibm.com/support/docview.wss?uid=isg1IJ06908 http://www.ibm.com/support/docview.wss?uid=isg1IJ06934 https://www.ibm.com/support/docview.wss?uid=isg1IJ06904 https://www.ibm.com/support/docview.wss?uid=isg1IJ06905 https://www.ibm.com/support/docview.wss?uid=isg1IJ06906 https://www.ibm.com/support/docview.wss?uid=isg1IJ06907 https://www.ibm.com/support/docview.wss?uid=isg1IJ06908 https://www.ibm.com/support/docview.wss?uid=isg1IJ06934 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/rmsock_fix2.tar http://aix.software.ibm.com/aix/efixes/security/rmsock_fix2.tar https://aix.software.ibm.com/aix/efixes/security/rmsock_fix2.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 IJ06935s1a.180611.epkg.Z key_w_fix 6.1.9. 9 IJ06905s9a.180608.epkg.Z key_w_fix 6.1.9.1 0 IJ06905s9a.180608.epkg.Z key_w_fix 6.1.9.11 IJ06905s9a.180608.epkg.Z key_w_fix 7.1.4. 4 IJ06906s4a.180607.epkg.Z key_w_fix 7.1.4. 5 IJ06906s4a.180607.epkg.Z key_w_fix 7.1.4.6 IJ06906s4a.180607.epkg.Z key_w_fix 7.1.5. 0 IJ06904s5a.180607.epkg.Z key_w_fix 7.1.5. 1 IJ06904s5a.180607.epkg.Z key_w_fix 7.1.5.2 IJ06904s5a.180607.epkg.Z key_w_fix 7.2.0. 4 IJ06934s0a.180607.epkg.Z key_w_fix 7.2.0. 5 IJ06934s0a.180607.epkg.Z key_w_fix 7.2.0.6 IJ06934s0a.180607.epkg.Z key_w_fix 7.2.1. 2 IJ06907s1a.180607.epkg.Z key_w_fix 7.2.1. 3 IJ06907s1a.180607.epkg.Z key_w_fix 7.2.1.4 IJ06907s1a.180607.epkg.Z key_w_fix 7.2.2. 0 IJ06908s2a.180607.epkg.Z key_w_fix 7.2.2. 1 IJ06908s2a.180607.epkg.Z key_w_fix 7.2.2.2 IJ06908s2a.180607.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.2.2 is AIX 7200-02-02. VIOS Level Interim Fix (*.Z) KEY - ----------------------------------------------- 2.2. 4 . 40 IJ06905s9a.180608.epkg.Z key_w_fix 2.2. 4.50 IJ06905s9a.180608.epkg.Z key_w_fix 2.2. 4.60 IJ06905s9a.180608.epkg.Z key_w_fix 2.2. 5.20 IJ06905s9a.180608.epkg.Z key_w_fix 2.2. 5.30 IJ06905s9a.180608.epkg.Z key_w_fix 2.2. 5.40 IJ06905s9a.180608.epkg.Z key_w_fix 2.2.6. 10 IJ06905s9a.180608.epkg.Z key_w_fix 2.2.6.20 IJ06905s9a.180608.epkg.Z key_w_fix 2.2.6.21 IJ06905s9a.180608.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf rmsock_fix2.tar cd rmsock_fix2 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 - ----------------------------------------------------------------------------------------------------- ecf6f66a7b4b46d409d793f20040ee482483b1574171fb9359a923dd4895ab1a IJ06904s5a.180607.epkg.Z key_w_csum c3c126553e839d9005e57b9c86c64ee9ec6bbaf2ab9a11a1999c5e513a27169c IJ06905s9a.180608.epkg.Z key_w_csum c9853fd282018e3d4a7f43d7be2bdb8683e0b6fcafa030b0da3066071714a58b IJ06906s4a.180607.epkg.Z key_w_csum d315a1422bad889b916b05bedd3f7a2017a6fd0cec92102bf82a4ae29097778e IJ06907s1a.180607.epkg.Z key_w_csum 1cf55bf5ba872df48e210a65d5d0830f08cff0173dc5cc6570be7b6a02268241 IJ06908s2a.180607.epkg.Z key_w_csum b9ff613c66d80bb855808e2ef94a67d5643fd7587b134dc6a5619ac708c3a8d0 IJ06934s0a.180607.epkg.Z key_w_csum 1403b64ca4a545ef791460764a184d5a48a7112daec235474f070c5ff569e6cd IJ06935s1a.180611.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/rmsock_advisory2.asc.sig https://aix.software.ibm.com/aix/efixes/security/rmsock_advisory2.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/rmsock_advisory2.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. Acknowlegement The vulnerability was reported to IBM by Tim Brown, Security Advisor EMEAR, Cisco. *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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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