IBM PowerVM VIOS could allow a remote attacker to tamper with system configuration or cause a denial of service

IBM SECURITY ADVISORY

First Issued: Thu Jul 28 13:39:29 CDT 2022

The most recent version of this document is available here:

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

Security Bulletin: IBM PowerVM VIOS could allow a remote attacker to tamper
with system configuration or cause a denial of service (CVE-2022-35643)

===============================================================================

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
    https://vulners.com/cve/CVE-2022-35643
    https://vulners.com/cve/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 Environmental Score*: Undefined
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:

    VIOS 3.1

    The following fileset levels are vulnerable:
    
    key_fileset = aix

    Fileset                 Lower Level  Upper Level KEY 
    ---------------------------------------------------------
    devices.vtdev.scsi.rte  7.2.4.0      7.2.4.4     key_w_fs
    devices.vtdev.scsi.rte  7.2.5.0      7.2.5.3     key_w_fs
    devices.vtdev.scsi.rte  7.2.5.100    7.2.5.102   key_w_fs

    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:

    A. APARS
        
        IBM has assigned the following APARs to this problem:

        VIOS Level APAR    Availability  SP       KEY
        ----------------------------------------------------
        3.1.1      IJ40954 **            N/A      key_w_apar
        3.1.2      IJ40951 **            3.1.2.50 key_w_apar
        3.1.3      IJ40952 **            3.1.3.30 key_w_apar

        Subscribe to the APARs here:

        http://www.ibm.com/support/pages/apar/IJ40951
        http://www.ibm.com/support/pages/apar/IJ40952
        http://www.ibm.com/support/pages/apar/IJ40954

        https://www.ibm.com/support/pages/apar/IJ40951
        https://www.ibm.com/support/pages/apar/IJ40952
        https://www.ibm.com/support/pages/apar/IJ40954

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

        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.
        
        VIOS Level  Interim Fix (*.Z)         KEY
        -----------------------------------------------
        3.1.1.30    IJ40954s3a.220711.epkg.Z  key_w_fix
        3.1.1.40    IJ40954s4a.220711.epkg.Z  key_w_fix
        3.1.1.50    IJ40954s5a.220711.epkg.Z  key_w_fix
        3.1.2.10    IJ40951s1a.220711.epkg.Z  key_w_fix
        3.1.2.21    IJ40951s2a.220711.epkg.Z  key_w_fix
        3.1.2.30    IJ40951s3a.220711.epkg.Z  key_w_fix
        3.1.3.10    IJ40952s3b.220712.epkg.Z  key_w_fix
        3.1.3.14    IJ40952s3a.220712.epkg.Z  key_w_fix
        3.1.3.21    IJ40952s4a.220712.epkg.Z  key_w_fix

        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:

        openssl dgst -sha256                                              filename                 KEY
        -----------------------------------------------------------------------------------------------------
        f0745566389979df0a42bf1ba2ac477aed772e34c411a24c6b1adb328bc3b774  IJ40951s1a.220711.epkg.Z key_w_csum
        abb309f88ed635aeada75b85931ffd5634e338cbd272db91018e21e3cbd37224  IJ40951s2a.220711.epkg.Z key_w_csum
        6405a177fa465e4eba4c92e44de7c4f37a9a7c95a3925baa567ea4b1f7f4f994  IJ40951s3a.220711.epkg.Z key_w_csum
        57d2dea8596bff2b0987962f0049e604a4cd2893de7f81c990738fb044750aa2  IJ40952s3a.220712.epkg.Z key_w_csum
        844e03208b787d38f8e650d03cf3ebccaa5b31a6cfc54a06bc3673912bb1581d  IJ40952s3b.220712.epkg.Z key_w_csum
        8e6570e0133208b232610c536fc9af00ed32630a8f62997fb402f6e383f10a3a  IJ40952s4a.220712.epkg.Z key_w_csum
        e31f8e74ea9bf16aa613baa21f9a11bd95f7780cc5971c1db36b84e3248326e2  IJ40954s3a.220711.epkg.Z key_w_csum
        c953530436cd7847632c89490fd34cb03437671be9923e62cba16b426e8a2f87  IJ40954s4a.220711.epkg.Z key_w_csum
        115086d423a282a128098f12a6f34b7e4284249c148ca329d246385b47ddff8f  IJ40954s5a.220711.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 VIOS Support at
        https://ibm.com/support/ 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
        https://aix.software.ibm.com/aix/efixes/security/vios_advisory.asc.sig
        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

        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 VIOS Security Advisories via email,
please visit "My Notifications":

    http://www.ibm.com/support/mynotifications
    https://www.ibm.com/support/mynotifications

To view previously issued advisories, please visit:

    http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
    https://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 VIOS support center for any
assistance.

REFERENCES:

Review this information as needed, no action required.

Complete CVSS v3 Guide:
    http://www.first.org/cvss/user-guide
    https://www.first.org/cvss/user-guide
On-line Calculator v3:
    http://www.first.org/cvss/calculator/3.0
    https://www.first.org/cvss/calculator/3.0

RELATED INFORMATION:

Security Bulletin: IBM PowerVM VIOS could allow a remote attacker to tamper
    with system configuration or cause a denial of service (CVE-2022-35643)
    https://www.ibm.com/support/pages/node/6607886

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Thu Jul 28 13:39:29 CDT 2022

===============================================================================

*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.