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ibmIBME1BB387A78EF45ECA68CCA2BB0051D10F9A7562A2470DEE2694CC887B32FFB6F
HistoryDec 08, 2020 - 3:08 p.m.

Security Bulletin: IBM has released AIX and VIOS iFixes in response to a vulnerability in IBM POWER9 (CVE-2020-4788)

2020-12-0815:08:44
www.ibm.com
26

EPSS

0

Percentile

9.7%

Summary

IBM has released the following fixes for AIX and VIOS in response to CVE-2020-4788.

Vulnerability Details

CVEID: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 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

A. APARS

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&gt;
<https://www.ibm.com/support/pages/apar/IJ28227&gt;
<https://www.ibm.com/support/pages/apar/IJ28228&gt;
<https://www.ibm.com/support/pages/apar/IJ28229&gt;

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&gt;
<https://aix.software.ibm.com/aix/efixes/security/power9_fix.tar&gt;

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/&gt; 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&gt;
<https://aix.software.ibm.com/aix/efixes/security/power9_advisory.asc.sig&gt;
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&gt;

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

CPENameOperatorVersion
aixeq7.1
aixeq7.2