IBM SECURITY ADVISORY First Issued: Thu Nov 19 17:01:56 CST 2020 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/power9_advisory.asc https://aix.software.ibm.com/aix/efixes/security/power9_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/power9_advisory.asc Security Bulletin: IBM has released AIX and VIOS iFixes in response to a vulnerability in IBM POWER9 (CVE-2020-4788) =============================================================================== SUMMARY: IBM has released the following fixes for AIX and VIOS in response to CVE-2020-4788. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2020-4788 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-4788 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-4788 DESCRIPTION: IBM Power9 processors could allow a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances. CVSS Base Score: 5.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/189296 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) AFFECTED PRODUCTS AND VERSIONS: AIX 7.1, 7.2 VIOS 3.1 The vulnerabilities in the following filesets are being addressed: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- bos.mp64 7.1.5.0 7.1.5.40 key_w_fs bos.mp64 7.2.3.0 7.2.3.19 key_w_fs bos.mp64 7.2.4.0 7.2.4.6 key_w_fs bos.mp64 7.2.5.0 7.2.5.1 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.mp64 REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- 7.1.5 IJ28229 ** SP08 key_w_apar 7.2.3 IJ28228 ** SP07 key_w_apar 7.2.4 IJ28227 ** SP04 key_w_apar 7.2.5 IJ28226 ** SP02 key_w_apar VIOS Level APAR Availability SP KEY ---------------------------------------------------- 3.1.0 IJ28228 ** 3.1.0.60 key_w_apar 3.1.1 IJ28227 ** 3.1.1.40 key_w_apar 3.1.2 IJ28226 ** 3.1.2.20 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/pages/apar/IJ28226 http://www.ibm.com/support/pages/apar/IJ28227 http://www.ibm.com/support/pages/apar/IJ28228 http://www.ibm.com/support/pages/apar/IJ28229 https://www.ibm.com/support/pages/apar/IJ28226 https://www.ibm.com/support/pages/apar/IJ28227 https://www.ibm.com/support/pages/apar/IJ28228 https://www.ibm.com/support/pages/apar/IJ28229 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. An LPAR system reboot is required to complete the iFix installation, or Live Update may be used on AIX 7.2 to avoid a reboot. The AIX and VIOS fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/power9_fix.tar http://aix.software.ibm.com/aix/efixes/security/power9_fix.tar https://aix.software.ibm.com/aix/efixes/security/power9_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 ---------------------------------------------- 7.1.5.5 IJ28229s5a.200921.epkg.Z key_w_fix 7.1.5.5 IJ28229s5b.200922.epkg.Z key_w_fix 7.1.5.6 IJ28229s6a.200921.epkg.Z key_w_fix 7.1.5.6 IJ28229s6b.200922.epkg.Z key_w_fix 7.1.5.6 IJ28229s6c.200922.epkg.Z key_w_fix 7.1.5.7 IJ28229s7a.201117.epkg.Z key_w_fix 7.1.5.7 IJ28229s7b.201117.epkg.Z key_w_fix 7.2.3.3 IJ28228s3a.200921.epkg.Z key_w_fix 7.2.3.4 IJ28228s4a.200921.epkg.Z key_w_fix 7.2.3.5 IJ28228s5a.200921.epkg.Z key_w_fix 7.2.4.0 IJ28227s0a.200922.epkg.Z key_w_fix 7.2.4.1 IJ28227s1a.200922.epkg.Z key_w_fix 7.2.4.2 IJ28227s2a.200922.epkg.Z key_w_fix 7.2.4.2 IJ28227s2b.200922.epkg.Z key_w_fix 7.2.4.2 IJ28227s2c.200922.epkg.Z key_w_fix 7.2.5.0 IJ28226s1b.201117.epkg.Z key_w_fix 7.2.5.1 IJ28226s1a.201117.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.3.5 is AIX 7200-03-05. NOTE: Multiple iFixes are provided for AIX 7100-05-05, 7100-05-06, 7100-05-07, and 7200-04-02. IJ28229s5a is for AIX 7100-05-05 with bos.mp64 fileset level 7.1.5.35. IJ28229s5b is for AIX 7100-05-05 with bos.mp64 fileset level 7.1.5.34. IJ28229s6a is for AIX 7100-05-06 with bos.mp64 fileset level 7.1.5.38. IJ28229s6b is for AIX 7100-05-06 with bos.mp64 fileset level 7.1.5.37. IJ28229s6c is for AIX 7100-05-06 with bos.mp64 fileset level 7.1.5.36. IJ28229s7a is for AIX 7100-05-07 with bos.mp64 fileset level 7.1.5.40. IJ28229s7b is for AIX 7100-05-07 with bos.mp64 fileset level 7.1.5.39. IJ28227s2a is for AIX 7200-04-02 with bos.mp64 fileset level 7.2.4.6. IJ28227s2b is for AIX 7200-04-02 with bos.mp64 fileset level 7.2.4.4. IJ28227s2c is for AIX 7200-04-02 with bos.mp64 fileset level 7.2.4.3. Please reference the Affected Products and Version section above for help with checking installed fileset levels. VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 3.1.0.20 IJ28228s3a.200921.epkg.Z key_w_fix 3.1.0.30 IJ28228s4a.200921.epkg.Z key_w_fix 3.1.0.40 IJ28228s5a.200921.epkg.Z key_w_fix 3.1.1.0 IJ28227s0a.200922.epkg.Z key_w_fix 3.1.1.10 IJ28227s1a.201205.epkg.Z key_w_fix 3.1.1.20 IJ28227s2c.200922.epkg.Z key_w_fix 3.1.1.21 IJ28227s2b.200922.epkg.Z key_w_fix 3.1.1.25 IJ28227s2a.200922.epkg.Z key_w_fix 3.1.2.0 IJ28226s1b.201117.epkg.Z key_w_fix 3.1.2.10 IJ28226s1a.201117.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf power9_fix.tar cd power9_fix Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 [filename]" command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- 7b7e42cbe9d554d367b0b1e7c835f00acf56542494ba2335c99d2ab5bf0e8a90 IJ28226s1a.201117.epkg.Z key_w_csum 917d14f1de9d035bb886832c0699318f8d7375229cd023b918f6cbd52f7d32c8 IJ28226s1b.201117.epkg.Z key_w_csum f0c4d9afcb04e50c2136571cc71a1cc9be5af3f59255f2d8715ac2ae484bb946 IJ28227s0a.200922.epkg.Z key_w_csum e8c72d5ed5390822100650cb070f202ec5acb04b837137a89a8f752291f5932d IJ28227s1a.200922.epkg.Z key_w_csum 5f346c251953846f58b844d5094013d2252d452058cb5da224f36a528d17ede0 IJ28227s1a.201205.epkg.Z key_w_csum 7e0cf61c13075097fe8b0cee502d720502e98e1a123c3296f34f15300f90eea3 IJ28227s2a.200922.epkg.Z key_w_csum 877fe90f3400c78a2f3b77725c7b691efc295c9bf3feb88745bafdd8c88f3bd7 IJ28227s2b.200922.epkg.Z key_w_csum a1b4860075e719f38f815555c58fccb375e0eec9494893b3c58f4f0cbf8e8ae4 IJ28227s2c.200922.epkg.Z key_w_csum 25b098e2e46401d76764da722c9e188b63e20f421528df6be39a97fc953f7fb1 IJ28228s3a.200921.epkg.Z key_w_csum f7d43a6ac69315919a1aa0d95315fb75a346f9108d43e49e31c6fc9442fff66f IJ28228s4a.200921.epkg.Z key_w_csum 386be2edbaad3eb83d5d40c0e36284c0a572d560f976f46fd1060af25f13e5fe IJ28228s5a.200921.epkg.Z key_w_csum 9848255e82e0b2c2d1106a2d1f5d788eb511bb5e635256e7d6d6a65a746e7822 IJ28229s4a.200921.epkg.Z key_w_csum f2365acc12ee821cddf1ffb30e94b03c334472384f03bedb41144766326bea22 IJ28229s5a.200921.epkg.Z key_w_csum 986822400bff40e2f28c8bf084e4e7474e6b7529ea2a8993c63d6294cd7419d3 IJ28229s5b.200922.epkg.Z key_w_csum cf2cf1d43a23fca5ad47d9b53a5aa16cedd4338238abb82cc4b7e36c4b981d92 IJ28229s6a.200921.epkg.Z key_w_csum 3d95fc39119f8910f4ac652b771524c64866b44552285816a1297b2e33ca6b6c IJ28229s6b.200922.epkg.Z key_w_csum f96bae09f77e0ca2c6d116623acb8a247f98e974a0036dbf01e17d39dca4a328 IJ28229s6c.200922.epkg.Z key_w_csum d1de12482295ef395c0d26892820b71f2e0e4184a4cfd9d8fd4cff2da6c9fa7b IJ28229s7a.201117.epkg.Z key_w_csum 36d43d4560d2a7aca52aeb2d8615635c2e4d76bb92d5d4698ccc8e21ffd8448c IJ28229s7b.201117.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/power9_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/power9_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/power9_advisory.asc.sig C. FIX AND INTERIM FIX INSTALLATION An LPAR system reboot is required to complete the iFix installation, or Live Update may be used on AIX 7.2 to avoid a reboot. 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: ftp://ftp.software.ibm.com/systems/power/AIX/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: IBM has released AIX and VIOS iFixes in response to a vulnerability in IBM POWER9 (CVE-2020-4788) https://www.ibm.com/support/pages/node/6370729 ACKNOWLEDGEMENTS: Anthony Steinhauser of Google's Safeside Project. CHANGE HISTORY: First Issued: Thu Nov 19 17:01:56 CST 2020 =============================================================================== *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.