Summary

A vulnerability in IBM PowerVM VIOS could allow a remote attacker to tamper with system configuration or cause a denial of service (CVE-2022-35643).

Vulnerability Details

CVEID:CVE-2022-35643
**DESCRIPTION:**IBM PowerVM VIOS could allow a remote attacker to tamper with system configuration or cause a denial of service.
CVSS Base score: 9.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/230956 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H)

Affected Products and Versions

The following fileset levels are vulnerable:

To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in the VIOS user’s guide.

Example: lslpp -L | grep -i devices.vtdev.scsi.rte

Remediation/Fixes

A. APARS

IBM has assigned the following APARs to this problem:

Subscribe to the APARs here:

<https://www.ibm.com/support/pages/apar/IJ40951&gt;

<https://www.ibm.com/support/pages/apar/IJ40952&gt;

<https://www.ibm.com/support/pages/apar/IJ40954&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

IBM strongly recommends addressing the vulnerability now.

The fixes can be downloaded via ftp or http from:

ftp://aix.software.ibm.com/aix/efixes/security/vios_fix.tar

<http://aix.software.ibm.com/aix/efixes/security/vios_fix.tar&gt;

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

The links above are 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 VIOS level.

To extract the fixes from the tar file:

tar xvf vios_fix.tar

cd vios_fix

Verify you have retrieved the fixes intact:

The checksums below were generated using the “openssl dgst -sha256 [file]” command as the following:

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 VIOS Support at <https://ibm.com/support/&gt; and describe the discrepancy.

openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]

openssl dgst -sha256 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file]

Published advisory OpenSSL signature file location:

<http://aix.software.ibm.com/aix/efixes/security/vios_advisory.asc.sig&gt;

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

ftp://aix.software.ibm.com/aix/efixes/security/vios_advisory.asc.sig

C. FIX AND INTERIM FIX INSTALLATION

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