Security Bulletin
Summary
IBM has released the following fixes for AIX and VIOS in response to CVE-2020-4788.
Vulnerability Details
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 Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| AIX | 7.1 |
| AIX | 7.2 |
| VIOS | 3.1 |
The vulnerabilities in the following filesets are being addressed:
| Fileset | Lower Level | Upper Level |
| bos.mp64 | 7.1.5.0 | 7.1.5.40 |
| bos.mp64 | 7.2.3.0 | 7.2.3.19 |
| bos.mp64 | 7.2.4.0 | 7.2.4.6 |
| bos.mp64 | 7.2.5.0 | 7.2.5.1 |
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/Fixes
IBM has assigned the following APARs to this problem:
| AIX Level | APAR | SP |
| 7.1.5 | IJ28229 | SP08 |
| 7.2.3 | IJ28228 | SP07 |
| 7.2.4 | IJ28227 | SP04 |
| 7.2.5 | IJ28226 | SP02 |
| VIOS Level | APAR | SP |
| 3.1.0 | IJ28228 | 3.1.0.60 |
| 3.1.1 | IJ28227 | 3.1.1.40 |
| 3.1.2 | IJ28226 | 3.1.2.20 |
Subscribe to the APARs here:
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 |
| 7.1.5.5 |
IJ28229s5a.200921.epkg.Z |
| 7.1.5.5 |
IJ28229s5b.200922.epkg.Z |
| 7.1.5.6 |
IJ28229s6a.200921.epkg.Z |
| 7.1.5.6 |
IJ28229s6b.200922.epkg.Z |
| 7.1.5.6 |
IJ28229s6c.200922.epkg.Z |
| 7.1.5.7 |
IJ28229s7a.201117.epkg.Z |
| 7.1.5.7 |
IJ28229s7b.201117.epkg.Z |
| 7.2.3.3 |
IJ28228s3a.200921.epkg.Z |
| 7.2.3.4 |
IJ28228s4a.200921.epkg.Z |
| 7.2.3.5 |
IJ28228s5a.200921.epkg.Z |
| 7.2.4.0 |
IJ28227s0a.200922.epkg.Z |
| 7.2.4.1 |
IJ28227s1a.200922.epkg.Z |
| 7.2.4.2 |
IJ28227s2a.200922.epkg.Z |
| 7.2.4.2 |
IJ28227s2b.200922.epkg.Z |
| 7.2.4.2 |
IJ28227s2c.200922.epkg.Z |
| 7.2.5.0 |
IJ28226s1b.201117.epkg.Z |
| 7.2.5.1 |
IJ28226s1a.201117.epkg.Z |
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 |
| 3.1.0.20 |
IJ28228s3a.200921.epkg.Z |
| 3.1.0.30 |
IJ28228s4a.200921.epkg.Z |
| 3.1.0.40 |
IJ28228s5a.200921.epkg.Z |
| 3.1.1.0 |
IJ28227s0a.200922.epkg.Z |
| 3.1.1.10 |
IJ28227s1a.201205.epkg.Z |
| 3.1.1.20 |
IJ28227s2c.200922.epkg.Z |
| 3.1.1.21 |
IJ28227s2b.200922.epkg.Z |
| 3.1.1.25 |
IJ28227s2a.200922.epkg.Z |
| 3.1.2.0 |
IJ28226s1b.201117.epkg.Z |
| 3.1.2.10 |
IJ28226s1a.201117.epkg.Z |
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 |
|
7b7e42cbe9d554d367b0b1e7c835f00acf56542494ba2335c99d2ab5bf0e8a90 |
IJ28226s1a.201117.epkg.Z |
|
917d14f1de9d035bb886832c0699318f8d7375229cd023b918f6cbd52f7d32c8 |
IJ28226s1b.201117.epkg.Z |
|
f0c4d9afcb04e50c2136571cc71a1cc9be5af3f59255f2d8715ac2ae484bb946 |
IJ28227s0a.200922.epkg.Z |
|
e8c72d5ed5390822100650cb070f202ec5acb04b837137a89a8f752291f5932d |
IJ28227s1a.200922.epkg.Z |
|
5f346c251953846f58b844d5094013d2252d452058cb5da224f36a528d17ede0 |
IJ28227s1a.201205.epkg.Z |
|
7e0cf61c13075097fe8b0cee502d720502e98e1a123c3296f34f15300f90eea3 |
IJ28227s2a.200922.epkg.Z |
|
877fe90f3400c78a2f3b77725c7b691efc295c9bf3feb88745bafdd8c88f3bd7 |
IJ28227s2b.200922.epkg.Z |
|
a1b4860075e719f38f815555c58fccb375e0eec9494893b3c58f4f0cbf8e8ae4 |
IJ28227s2c.200922.epkg.Z |
|
25b098e2e46401d76764da722c9e188b63e20f421528df6be39a97fc953f7fb1 |
IJ28228s3a.200921.epkg.Z |
|
f7d43a6ac69315919a1aa0d95315fb75a346f9108d43e49e31c6fc9442fff66f |
IJ28228s4a.200921.epkg.Z |
|
386be2edbaad3eb83d5d40c0e36284c0a572d560f976f46fd1060af25f13e5fe |
IJ28228s5a.200921.epkg.Z |
|
9848255e82e0b2c2d1106a2d1f5d788eb511bb5e635256e7d6d6a65a746e7822 |
IJ28229s4a.200921.epkg.Z |
|
f2365acc12ee821cddf1ffb30e94b03c334472384f03bedb41144766326bea22 |
IJ28229s5a.200921.epkg.Z |
|
986822400bff40e2f28c8bf084e4e7474e6b7529ea2a8993c63d6294cd7419d3 |
IJ28229s5b.200922.epkg.Z |
|
cf2cf1d43a23fca5ad47d9b53a5aa16cedd4338238abb82cc4b7e36c4b981d92 |
IJ28229s6a.200921.epkg.Z |
|
3d95fc39119f8910f4ac652b771524c64866b44552285816a1297b2e33ca6b6c |
IJ28229s6b.200922.epkg.Z |
|
f96bae09f77e0ca2c6d116623acb8a247f98e974a0036dbf01e17d39dca4a328 |
IJ28229s6c.200922.epkg.Z |
|
d1de12482295ef395c0d26892820b71f2e0e4184a4cfd9d8fd4cff2da6c9fa7b |
IJ28229s7a.201117.epkg.Z |
|
36d43d4560d2a7aca52aeb2d8615635c2e4d76bb92d5d4698ccc8e21ffd8448c |
IJ28229s7b.201117.epkg.Z |
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
Get Notified about Future Security Bulletins
References
Acknowledgement
Anthony Steinhauser of Google's Safeside Project
Change History
18 Nov 2020: Initial Publication
*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
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
Document Location
Worldwide
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Document Information
Modified date:
08 December 2020
UID
ibm16370729