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CentOS ProjectKERNEL_ADVISORY3.ASCHistoryFeb 23, 2022 - 1:03 p.m.
Vulnerabilities in the AIX kernel
2022-02-2313:03:11
CentOS Project
aix.software.ibm.com
46
aix kernel
vulnerabilities
ibm
apars
aix 7.1
aix 7.2
vios 3.1
CVSS2
2.1
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
CVSS3
5.5
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
0
Percentile
5.1%
IBM SECURITY ADVISORY
First Issued: Wed Feb 23 13:03:11 CST 2022
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/kernel_advisory3.asc
https://aix.software.ibm.com/aix/efixes/security/kernel_advisory3.asc
ftp://aix.software.ibm.com/aix/efixes/security/kernel_advisory3.asc
Security Bulletin: Vulnerabilities in the AIX kernel (CVE-2021-38994,
CVE-2021-38995)
===============================================================================
SUMMARY:
There are multiple vulnerabilities in the AIX kernel.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2021-38994
https://vulners.com/cve/CVE-2021-38994
https://vulners.com/cve/CVE-2021-38994
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/213072
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-2021-38995
https://vulners.com/cve/CVE-2021-38995
https://vulners.com/cve/CVE-2021-38995
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/213073
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 7.1.5.45 key_w_fs
bos.mp64 7.2.4.0 7.2.4.9 key_w_fs
bos.mp64 7.2.5.0 7.2.5.3 key_w_fs
bos.mp64 7.2.5.100 7.2.5.103 key_w_fs
bos.mp64 7.3.0.0 7.3.0.1 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 IJ37452 ** SP10 key_w_apar
7.2.4 IJ37501 ** SP06 key_w_apar
7.2.5 IJ37012 ** SP04 key_w_apar
7.3.0 IJ37001 ** SP02 key_w_apar
VIOS Level APAR Availability SP KEY
----------------------------------------------------
3.1.1 IJ37501 ** 3.1.1.60 key_w_apar
3.1.2 IJ37776 ** 3.1.2.40 key_w_apar
3.1.3 IJ37012 ** 3.1.3.20 key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/pages/apar/IJ37001
http://www.ibm.com/support/pages/apar/IJ37012
http://www.ibm.com/support/pages/apar/IJ37452
http://www.ibm.com/support/pages/apar/IJ37501
http://www.ibm.com/support/pages/apar/IJ37776
https://www.ibm.com/support/pages/apar/IJ37001
https://www.ibm.com/support/pages/apar/IJ37012
https://www.ibm.com/support/pages/apar/IJ37452
https://www.ibm.com/support/pages/apar/IJ37501
https://www.ibm.com/support/pages/apar/IJ37776
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_fix3.tar
http://aix.software.ibm.com/aix/efixes/security/kernel_fix3.tar
https://aix.software.ibm.com/aix/efixes/security/kernel_fix3.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
----------------------------------------------
7.1.5.7 IJ37452m7a.220215.epkg.Z key_w_fix
7.1.5.8 IJ37452m8a.220215.epkg.Z key_w_fix
7.1.5.9 IJ37452s9a.220215.epkg.Z key_w_fix
7.1.5.9 IJ37452s9b.220215.epkg.Z key_w_fix
7.2.4.3 IJ37501m3a.220215.epkg.Z key_w_fix
7.2.4.4 IJ37501m4a.220215.epkg.Z key_w_fix
7.2.4.5 IJ37501m5a.220215.epkg.Z key_w_fix
7.2.5.1 IJ37776m1a.220215.epkg.Z key_w_fix
7.2.5.2 IJ37776m2a.220215.epkg.Z key_w_fix
7.2.5.3 IJ37012m3a.220215.epkg.Z key_w_fix
7.2.5.3 IJ37012m3b.220215.epkg.Z key_w_fix
7.3.0.1 IJ37001m1a.220215.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 7100-05-09 and
7200-05-03.
IJ37452s9a is for AIX 7100-05-09 with bos.mp64 fileset level 7.1.5.45.
IJ37452s9b is for AIX 7100-05-09 with bos.mp64 fileset level 7.1.5.44.
IJ37012m3a is for AIX 7200-05-03 with bos.mp64 fileset level 7.2.5.103.
IJ37012m3b is for AIX 7200-05-03 with bos.mp64 fileset level 7.2.5.101.
Please reference the Affected Products and Version section above
for help with checking installed fileset levels.
VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
3.1.1.30 IJ37501m3a.220215.epkg.Z key_w_fix
3.1.1.40 IJ37501m4a.220215.epkg.Z key_w_fix
3.1.1.50 IJ37501m5a.220215.epkg.Z key_w_fix
3.1.2.10 IJ37776m1a.220215.epkg.Z key_w_fix
3.1.2.21 IJ37776m2a.220215.epkg.Z key_w_fix
3.1.3.10 IJ37012m3b.220215.epkg.Z key_w_fix
3.1.3.14 IJ37012m3a.220215.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/kernel_advisory2.asc
https://www.ibm.com/support/pages/node/6483875
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
The fixes for 7.1 TL5 SP7 and SP8 include the following.
The fix for 7.1 TL5 SP9 should be installed alongside
the following:
https://aix.software.ibm.com/aix/efixes/security/libc_advisory2.asc
https://www.ibm.com/support/pages/node/6516774
To extract the fixes from the tar file:
tar xvf kernel_fix3.tar
cd kernel_fix3
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
-----------------------------------------------------------------------------------------------------
10e4ef561cfb0e44a698948eaa3f157c1fbdd22dc6b9095898f813e4e306fa55 IJ37001m1a.220215.epkg.Z key_w_csum
70e53abb9b1b60222a215b04373a79c315d003d5f174f9e1b2fa521bd3201c35 IJ37012m3a.220215.epkg.Z key_w_csum
b575eff5b745fabc369477cec9408e35bfac445d77835ed4df4836ca56fb7cf0 IJ37012m3b.220215.epkg.Z key_w_csum
7c3c4f2aaa7a3624066785211735decfe33bef38c01dff62c3c075f0c4ba535a IJ37452m7a.220215.epkg.Z key_w_csum
328b6d14775423691f5c3b746367e9fdbd24b71230195b93124e2066be499dc4 IJ37452m8a.220215.epkg.Z key_w_csum
6ffa2ad6d1dff2252b4cc5f6e7dfc1a83d15dedc44e0d35f69bfd7b01aab39b8 IJ37452s9a.220215.epkg.Z key_w_csum
e4c7fffdc340a122e42e3a1ce73a6f20ccf0d045dcd4958bc82b69b08add18d8 IJ37452s9b.220215.epkg.Z key_w_csum
ba1c1b1fbe6c1f6a68b6dd48d0f5e61221751d288e8bb141c5e4c2b806322044 IJ37501m3a.220215.epkg.Z key_w_csum
f0dc84ce2145a301b8e7ddbc0e6335bc93fe6468fafb67dd3b67bf73b535c5df IJ37501m4a.220215.epkg.Z key_w_csum
467d4747459d37489b2199d57836de3d79a3837b95c2aa29dc35f43fe33bd0ed IJ37501m5a.220215.epkg.Z key_w_csum
9acb84e45fa3aa0b8d36e9f63d29dcc0e335c0d55351a2a5b8433bd57075dc01 IJ37776m1a.220215.epkg.Z key_w_csum
30e03d25a0657290afb9c04ac1b5b06fd87a8a776dfe037b2d5dd9b92e16c7cd IJ37776m2a.220215.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_advisory3.asc.sig
https://aix.software.ibm.com/aix/efixes/security/kernel_advisory3.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/kernel_advisory3.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-2021-38994,
CVE-2021-38995)
https://www.ibm.com/support/pages/node/6558948
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Wed Feb 23 13:03:11 CST 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.
Related
nessus
nessus
AIX 7.2 TL 5 : kernel (IJ37776)
2022-02-24 00:00:00
AIX 7.2 TL 4 : kernel (IJ37501)
2022-02-24 00:00:00
AIX 7.2 TL 5 : kernel (IJ37012)
2022-02-24 00:00:00
ibm
ibm
nvd
nvd
CVE-2021-38995
2022-02-24 17:15:07
CVE-2021-38994
2022-02-24 17:15:07
cve
cve
CVE-2021-38994
2022-02-24 17:15:07
CVE-2021-38995
2022-02-24 17:15:07
cnvd
cnvd
IBM VIOS Input Validation Error Vulnerability (CNVD-2022-15531)
2022-02-28 00:00:00
IBM VIOS Input Validation Error Vulnerability
2022-02-28 00:00:00
prion
prion
Code injection
2022-02-24 17:15:00
Code injection
2022-02-24 17:15:00
cvelist
cvelist
CVE-2021-38995
2022-02-24 17:05:19
CVE-2021-38994
2022-02-24 17:05:12
CVSS2
2.1
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
CVSS3
5.5
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
0
Percentile
5.1%
Related for KERNEL_ADVISORY3.ASC