CentOS ProjectKERNEL_ADVISORY4.ASCAIX is vulnerable to a privilege escalation vulnerability,AIX kernel is vulnerable to a privilege escalation vulnerability
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%
IBM SECURITY ADVISORY
First Issued: Mon Sep 12 13:12:47 CDT 2022
|Updated: Mon Oct 10 14:29:18 CDT 2022
|Update: Corrected the affected upper fileset levels for VIOS 3.1.2.30 and
| 3.1.2.40. Added iFixes with the correct prereqs for VIOS 3.1.2.30 and
| 3.1.2.40.
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.asc
https://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.asc
ftp://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.asc
Security Bulletin: AIX is vulnerable to a privilege escalation vulnerability
(CVE-2022-34356)
===============================================================================
SUMMARY:
A vulnerability in the AIX kernel could allow a non-privileged local user
to obtain root privileges.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2022-34356
https://vulners.com/cve/CVE-2022-34356
https://vulners.com/cve/CVE-2022-34356
DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a
vulnerability in the AIX kernel to obtain root privileges.
CVSS Base Score: 8.4
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/230502
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)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.1, 7.2, 7.3
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 7.1.5.46 key_w_fs
bos.mp64 7.2.4.0 7.2.4.10 key_w_fs
| bos.mp64 7.2.5.0 7.2.5.5 key_w_fs
bos.mp64 7.2.5.100 7.2.5.105 key_w_fs
bos.mp64 7.3.0.0 7.3.0.3 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 IJ41688 ** SP11 key_w_apar
7.2.4 IJ41706 ** N/A key_w_apar
7.2.5 IJ41396 ** SP05 key_w_apar
7.3.0 IJ41687 ** SP03 key_w_apar
VIOS Level APAR Availability SP KEY
----------------------------------------------------
3.1.1 IJ41706 ** N/A key_w_apar
3.1.2 IJ41795 ** 3.1.2.50 key_w_apar
3.1.3 IJ41685 ** 3.1.3.30 key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/pages/apar/IJ41396
http://www.ibm.com/support/pages/apar/IJ41685
http://www.ibm.com/support/pages/apar/IJ41687
http://www.ibm.com/support/pages/apar/IJ41688
http://www.ibm.com/support/pages/apar/IJ41706
http://www.ibm.com/support/pages/apar/IJ41795
https://www.ibm.com/support/pages/apar/IJ41396
https://www.ibm.com/support/pages/apar/IJ41685
https://www.ibm.com/support/pages/apar/IJ41687
https://www.ibm.com/support/pages/apar/IJ41688
https://www.ibm.com/support/pages/apar/IJ41706
https://www.ibm.com/support/pages/apar/IJ41795
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.
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_fix4.tar
http://aix.software.ibm.com/aix/efixes/security/kernel_fix4.tar
https://aix.software.ibm.com/aix/efixes/security/kernel_fix4.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
----------------------------------------------
7.1.5.8 IJ41688m8a.220921.epkg.Z key_w_fix
7.1.5.9 IJ41688m9a.220822.epkg.Z key_w_fix
7.1.5.9 IJ41688m9b.220822.epkg.Z key_w_fix
| 7.1.5.10 IJ41688sAa.220913.epkg.Z key_w_fix
7.2.4.4 IJ41706m4a.220812.epkg.Z key_w_fix
7.2.4.5 IJ41706m5a.220810.epkg.Z key_w_fix
7.2.4.6 IJ41706s6a.220912.epkg.Z key_w_fix
7.2.5.2 IJ41795m2a.220812.epkg.Z key_w_fix
7.2.5.3 IJ41685m3a.220810.epkg.Z key_w_fix
7.2.5.3 IJ41685m3b.220812.epkg.Z key_w_fix
7.2.5.4 IJ41685s4a.220809.epkg.Z key_w_fix
7.3.0.1 IJ41687m1a.220810.epkg.Z key_w_fix
7.3.0.2 IJ41687s2a.220809.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.
IJ41688m9a is for AIX 7100-05-09 with bos.mp64 fileset level 7.1.5.45.
IJ41688m9b is for AIX 7100-05-09 with bos.mp64 fileset level 7.1.5.44.
IJ41685m3a is for AIX 7200-05-03 with bos.mp64 fileset level 7.2.5.103.
IJ41685m3b 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
-----------------------------------------------
3.1.1.40 IJ41706m4a.220812.epkg.Z key_w_fix
3.1.1.50 IJ41706m5a.220810.epkg.Z key_w_fix
3.1.1.60 IJ41706s6a.220912.epkg.Z key_w_fix
3.1.2.21 IJ41795m2a.220812.epkg.Z key_w_fix
| 3.1.2.30 IJ41795m3a.221010.epkg.Z key_w_fix
| 3.1.2.40 IJ41795s4a.221010.epkg.Z key_w_fix
3.1.3.10 IJ41685m3b.220812.epkg.Z key_w_fix
3.1.3.14 IJ41685m3a.220810.epkg.Z key_w_fix
3.1.3.21 IJ41685s4a.220809.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_advisory3.asc
https://www.ibm.com/support/pages/node/6558948
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
To extract the fixes from the tar file:
tar xvf kernel_fix4.tar
cd kernel_fix4
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
-----------------------------------------------------------------------------------------------------
782b9fa7c622a94f3cd27fda5549ed0499a95ffe710f8f281341c083e48318e7 IJ41685m3a.220810.epkg.Z key_w_csum
570207b39bc06daa4b8ecc1cacfb18c88ea67b11b0e446d68e0aacea7a0a0787 IJ41685m3b.220812.epkg.Z key_w_csum
24279e267c3b984a5bcbb1e49b889859214849a1abd46480062a92e89c9888d3 IJ41685s4a.220809.epkg.Z key_w_csum
04d0d828773808e3e43242f27bd69cdce7c97d5f6e100a3816a91b835e40f19d IJ41687m1a.220810.epkg.Z key_w_csum
5988765d4dbc0da7a3b5955d319a6521657dba3eafcc5b18169d5c3387276297 IJ41687s2a.220809.epkg.Z key_w_csum
| 5ce59e86e384190a64f5acb5d53f5fe538e02da995af5c7353b82de303c690d2 IJ41688sAa.220913.epkg.Z key_w_csum
f210a097a8e7ed79379ac7da6e55a41467d024caae3a0af779f8f77582a72953 IJ41688m8a.220921.epkg.Z key_w_csum
486e456306ffb0beedc58b67914b4f5e064f755e2f59ec2d677e0900166ed160 IJ41688m9a.220822.epkg.Z key_w_csum
866637d1012c63d91e789f517e40f43cfe28844486fe9ad9f9a5b3d5e98788b5 IJ41688m9b.220822.epkg.Z key_w_csum
f3129d961a5bcc3710329086455008f8911c17d011ce1cbdc55933cf4876ca68 IJ41706m4a.220812.epkg.Z key_w_csum
623335ceb612732f3fad2b0acdb2d5df69ce3d6fc89ae5ceccc757155eebbb06 IJ41706m5a.220810.epkg.Z key_w_csum
a67081a0bb4f1713ad8ed03ee798f12fdb7b25e09d36df47d73fe0a15cb993a6 IJ41706s6a.220912.epkg.Z key_w_csum
bcef535a8809cfb9bd34777e186ba489d49ac561e53620287016427ae5d919b0 IJ41795m2a.220812.epkg.Z key_w_csum
| d00aeb521e931d5ea5b12f5bc12a9f344e28a464fb4e5a111c116beba6cbc486 IJ41795m3a.221010.epkg.Z key_w_csum
| 67369d2d6df04fec8979b6d3d68dc94f5fbb5f44f7b5b3ba792a3b6f72f531d7 IJ41795s4a.221010.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_advisory4.asc.sig
https://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.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: AIX is vulnerable to a privilege escalation
vulnerability (CVE-2022-34356)
https://www.ibm.com/support/pages/node/6619721
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Mon Sep 12 13:12:47 CDT 2022
| Updated: Mon Oct 10 14:29:18 CDT 2022
| Update: Corrected the affected upper fileset levels for VIOS 3.1.2.30 and
| 3.1.2.40. Added iFixes with the correct prereqs for VIOS 3.1.2.30 and
| 3.1.2.40.
===============================================================================
*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
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%