IBM has released AIX iFixes in response to a vulnerability in IBM POWER9,IBM has released VIOS iFixes in response to a vulnerability in IBM POWER9

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
    https://vulners.com/cve/CVE-2020-4788
    https://vulners.com/cve/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.