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aixCentOS ProjectKERNEL_ADVISORY2.ASC
HistoryAug 25, 2021 - 2:58 p.m.

There are multiple vulnerabilities in the AIX kernel,There are multiple vulnerabilities in the AIX kernel for VIOS

2021-08-2514:58:13
CentOS Project
aix.software.ibm.com
22

7.2 High

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

0.0004 Low

EPSS

Percentile

5.1%

JSON

IBM SECURITY ADVISORY

First Issued: Wed Aug 25 14:58:13 CDT 2021
|Update 2: Wed Sep 1 16:11:34 CDT 2021
|Update: Additional iFixes are now available.
| Additional iFixes are now available for:
| AIX 7100-05-06 and 7100-05-07
| AIX 7200-03-05 and 7200-03-06
| AIX 7200-04-02 and 7200-04-03
| AIX 7200-05-01
| VIOS 3.1.0.40 and 3.1.0.50
| VIOS 3.1.1.25 and 3.1.1.30
| VIOS 3.1.2.10

The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/kernel_advisory2.asc
https://aix.software.ibm.com/aix/efixes/security/kernel_advisory2.asc
ftp://aix.software.ibm.com/aix/efixes/security/kernel_advisory2.asc

Security Bulletin: Vulnerabilities in the AIX kernel (CVE-2021-29727,
CVE-2021-29801, CVE-2021-29862)

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

SUMMARY:

There are multiple vulnerabilities in the AIX kernel.

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

VULNERABILITY DETAILS:

CVEID: CVE-2021-29727
    https://vulners.com/cve/CVE-2021-29727
    https://vulners.com/cve/CVE-2021-29727
DESCRIPTION: IBM AIX could allow a local user to exploit a vulnerability
    in the AIX kernel to cause a denial of service.
CVSS Base Score: 6.2
CVSS Temporal Score: See 
    https://exchange.xforce.ibmcloud.com/vulnerabilities/201106
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2021-29801
    https://vulners.com/cve/CVE-2021-29801
    https://vulners.com/cve/CVE-2021-29801
DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit
    a vulnerability in the kernel to gain root privileges.
CVSS Base Score: 8.4
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/203977
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

CVEID: CVE-2021-29862
    https://vulners.com/cve/CVE-2021-29862
    https://vulners.com/cve/CVE-2021-29862
DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit
    a vulnerability in the AIX kernel to cause a denial of service.
CVSS Base Score: 6.2
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/206086
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)


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 7.1.5.42 key_w_fs
bos.mp64 7.2.3.0 7.2.3.21 key_w_fs
bos.mp64 7.2.4.0 7.2.4.8 key_w_fs
bos.mp64 7.2.5.0 7.2.5.3 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     IJ33318  **            SP09      key_w_apar
        7.2.3     IJ32629  **            N/A       key_w_apar
        7.2.4     IJ32630  **            SP05      key_w_apar
        7.2.5     IJ32415  **            SP03      key_w_apar

        VIOS Level APAR    Availability  SP       KEY
        ----------------------------------------------------
        3.1.0     IJ32629  **            N/A      key_w_apar
        3.1.1     IJ32630  **            3.1.1.50 key_w_apar
        3.1.2     IJ32631  **            3.1.2.30 key_w_apar

        Subscribe to the APARs here:

        http://www.ibm.com/support/pages/apar/IJ33318
        http://www.ibm.com/support/pages/apar/IJ32415
        http://www.ibm.com/support/pages/apar/IJ32629
        http://www.ibm.com/support/pages/apar/IJ32630
        http://www.ibm.com/support/pages/apar/IJ32631

        https://www.ibm.com/support/pages/apar/IJ33318
        https://www.ibm.com/support/pages/apar/IJ32629
        https://www.ibm.com/support/pages/apar/IJ32630
        https://www.ibm.com/support/pages/apar/IJ32631

        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/kernel_fix2.tar
        http://aix.software.ibm.com/aix/efixes/security/kernel_fix2.tar
        https://aix.software.ibm.com/aix/efixes/security/kernel_fix2.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
        ----------------------------------------------

| 7.1.5.6 IJ33318m6a.210816.epkg.Z key_w_fix
| 7.1.5.7 IJ33318m7a.210813.epkg.Z key_w_fix
7.1.5.8 IJ33318m8a.210813.epkg.Z key_w_fix
| 7.2.3.5 IJ32629m5a.210805.epkg.Z key_w_fix
| 7.2.3.6 IJ32629m6a.210805.epkg.Z key_w_fix
7.2.3.7 IJ32629s7a.210805.epkg.Z key_w_fix
| 7.2.4.2 IJ32630m2e.210901.epkg.Z key_w_fix
| 7.2.4.2 IJ32630m2f.210901.epkg.Z key_w_fix
| 7.2.4.3 IJ32630m3b.210901.epkg.Z key_w_fix
7.2.4.4 IJ32630s4a.210813.epkg.Z key_w_fix
| 7.2.5.1 IJ32631m1a.210805.epkg.Z key_w_fix
7.2.5.2 IJ32631s2a.210805.epkg.Z key_w_fix

        Please note that the above table refers to AIX TL/SP level as
        opposed to fileset level, i.e., 7.2.5.2 is AIX 7200-05-02.

| NOTE: Multiple iFixes are provided for AIX 7200-04-02.
| IJ32630m2e is for AIX 7200-04-02 with bos.mp64 fileset level 7.2.4.6.
| IJ32630m2f is for AIX 7200-04-02 with bos.mp64 fileset level 7.2.4.4.

        Please reference the Affected Products and Version section above
        for help with checking installed fileset levels.

        VIOS Level  Interim Fix (*.Z)         KEY
        -----------------------------------------------

| 3.1.0.40 IJ32629m5a.210805.epkg.Z key_w_fix
| 3.1.0.50 IJ32629m6a.210805.epkg.Z key_w_fix
3.1.0.60 IJ32629s7a.210805.epkg.Z key_w_fix
| 3.1.1.21 IJ32630m2f.210901.epkg.Z key_w_fix
| 3.1.1.25 IJ32630m2e.210901.epkg.Z key_w_fix
| 3.1.1.30 IJ32630m3b.210901.epkg.Z key_w_fix
3.1.1.40 IJ32630s4a.210813.epkg.Z key_w_fix
| 3.1.2.10 IJ32631m1a.210805.epkg.Z key_w_fix
3.1.2.21 IJ32631s2a.210805.epkg.Z key_w_fix

        The fixes are cumulative and address previously issued
        AIX/VIOS kernel security bulletins with respect to SP and TL,
        which includes:
        https://aix.software.ibm.com/aix/efixes/security/trace_advisory.asc
        https://www.ibm.com/support/pages/node/6464369
        https://aix.software.ibm.com/aix/efixes/security/gencore_advisory.asc
        https://www.ibm.com/support/pages/node/6406022
        https://aix.software.ibm.com/aix/efixes/security/power9_advisory.asc
        https://www.ibm.com/support/pages/node/6370729

        To extract the fixes from the tar file:

        tar xvf kernel_fix2.tar
        cd kernel_fix2

        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
        -----------------------------------------------------------------------------------------------------

| dccf7e96800c47b042d707aa27cf9a02c5ede3ed0de9f9c264d1438bb37a9a03 IJ32629m5a.210805.epkg.Z key_w_csum
| 45304b30684c3ba59a1106cc70ad1fcb0542cc5108bfc97ace4826ab34f8d7ad IJ32629m6a.210805.epkg.Z key_w_csum
9dee72202fc0211874b76660e3571c3ff6ffbe811682903af9e95038a47d0552 IJ32629s7a.210805.epkg.Z key_w_csum
| 900ffced3671f25b60351e7fd7bee8282d66a89abd6826ae9d1aa5bb295f8452 IJ32630m2e.210901.epkg.Z key_w_csum
| 579d8d5d6c5550dc410b9b189bdaaa5d356a435e1466d69add10c992065da611 IJ32630m2f.210901.epkg.Z key_w_csum
| 4c23de46e121caddec42ef4c5f98d3a058c749d7624305dde817ec45874040cc IJ32630m3b.210901.epkg.Z key_w_csum
5c24ca516cc0e14a297020473b5311deaff56a7eb3519ee887d3a4accc719c20 IJ32630s4a.210813.epkg.Z key_w_csum
| 191c759367ddf5c4b7318eb4171fe222194e6b88f78f6abede81de6370761522 IJ32631m1a.210805.epkg.Z key_w_csum
bbaef236cc66ff140ac2301ec59fffea003570efeb764ac44db3101c394b6838 IJ32631s2a.210805.epkg.Z key_w_csum
| af04022a969f8f0415be13c74524e6112e985686456d1565502af2e68230364b IJ33318m6a.210816.epkg.Z key_w_csum
| 0f183f42aad6720559a1efa7e1de8534a9889fc1cc8c1cc4b8e03ebf9bbf146a IJ33318m7a.210813.epkg.Z key_w_csum
e0e80a9ca47382f11d0d9cde04fe305492cf4c5c772f345a1413013de5095446 IJ33318m8a.210813.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 -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/kernel_advisory2.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/kernel_advisory2.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/kernel_advisory2.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: Vulnerabilities in the AIX kernel (CVE-2021-29727,
        CVE-2021-29801, CVE-2021-29862)
    https://www.ibm.com/support/pages/node/6483875

ACKNOWLEDGEMENTS:

CHANGE HISTORY:

First Issued: Wed Aug 25 14:58:13 CDT 2021

| Update 2: Wed Sep 1 16:11:34 CDT 2021
| Update: Additional iFixes are now available.
| Additional iFixes are now available for:
| AIX 7100-05-06 and 7100-05-07
| AIX 7200-03-05 and 7200-03-06
| AIX 7200-04-02 and 7200-04-03
| AIX 7200-05-01
| VIOS 3.1.0.40 and 3.1.0.50
| VIOS 3.1.1.25 and 3.1.1.30
| VIOS 3.1.2.10
| Updated: Fri Aug 27 08:31:32 CDT 2021
| Update: Corrected the AIX 7.1 TL5 affected fileset levels. The upper
| affected fileset level for AIX 7.1 TL5 is bos.mp64 7.1.5.42.

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

*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.

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7.2 High

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

7.8 High

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LOCAL

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LOW

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LOW

User Interaction

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HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

0.0004 Low

EPSS

Percentile

5.1%

JSON
Related for KERNEL_ADVISORY2.ASC
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