6.2 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%
IBM SECURITY ADVISORY
First Issued: Mon Dec 18 09:23:16 CST 2023
The most recent version of this document is available here:
https://aix.software.ibm.com/aix/efixes/security/aixwindows_advisory.asc
Security Bulletin: AIX is vulnerable to denial of service due to AIXWindows
(CVE-2023-45172)
===============================================================================
SUMMARY:
A vulnerability in AIXwindows could allow a non-privileged local user to
cause a denial of service (CVE-2023-45172).
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2023-45172
https://vulners.com/cve/CVE-2023-45172
DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a
vulnerability in AIXwindows to cause a denial of service.
CVSS Base Score: 6.2
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/267970
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 7.2, 7.3
VIOS 3.1
The vulnerabilities in the following filesets are being addressed:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
X11.base.smt 7.2.3.0 7.2.3.15 key_w_fs
X11.base.smt 7.3.0.0 7.3.0.0 key_w_fs
X11.base.smt 7.3.1.0 7.3.1.0 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 X11.base.smt
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR Availability SP KEY
-----------------------------------------------------
7.2.5 IJ48252 ** SP07 key_w_apar
7.3.0 IJ48758 ** N/A key_w_apar
7.3.1 IJ48540 ** SP03 key_w_apar
VIOS Level APAR Availability SP KEY
-----------------------------------------------------
3.1.3 IJ48252 ** N/A key_w_apar
3.1.4 IJ48252 ** 3.1.4.30 key_w_apar
Subscribe to the APARs here:
https://www.ibm.com/support/pages/apar/[APAR Number]
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.
The AIX and VIOS fixes can be downloaded via https from:
https://aix.software.ibm.com/aix/efixes/security/aixwindows_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
----------------------------------------------
7.2.5.5 IJ48252s6a.230928.epkg.Z key_w_fix
7.2.5.6 IJ48252s6a.230928.epkg.Z key_w_fix
7.3.0.2 IJ48758s4a.230928.epkg.Z key_w_fix
7.3.0.3 IJ48758s4a.230928.epkg.Z key_w_fix
7.3.0.4 IJ48758s4a.230928.epkg.Z key_w_fix
7.3.1.1 IJ48540s2a.230928.epkg.Z key_w_fix
7.3.1.2 IJ48540s2a.230928.epkg.Z key_w_fix
Please note that the above table refers to AIX TL/SP level as
opposed to fileset level, i.e., 7.2.5.6 is AIX 7200-05-06.
VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
3.1.3.21 IJ48252s6a.230928.epkg.Z key_w_fix
3.1.3.30 IJ48252s6a.230928.epkg.Z key_w_fix
3.1.3.40 IJ48252s6a.230928.epkg.Z key_w_fix
3.1.4.10 IJ48252s6a.230928.epkg.Z key_w_fix
3.1.4.21 IJ48252s6a.230928.epkg.Z key_w_fix
To extract the fixes from the tar file:
tar xvf aixwindows_fix.tar
cd aixwindows_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
-----------------------------------------------------------------------------------------------------
a0fb7c8612d2b38f8b7def05c7d2e1cb465d5f17b8a1f35364968455fa2a8981 IJ48252s6a.230928.epkg.Z key_w_csum
3ce8160e19d373a29c00740574c0276eb5d8ed3f32388acb810955038d868fb6 IJ48540s2a.230928.epkg.Z key_w_csum
2a54567e10b4cc0464489421c78b56cf4f449da3bc85c590b3413cc34fc21f33 IJ48758s4a.230928.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:
https://aix.software.ibm.com/aix/efixes/security/aixwindows_advisory.asc.sig
C. FIX AND INTERIM FIX INSTALLATION
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:
https://www.ibm.com/support/pages/managing-interim-fixes-aix
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
Contact IBM Support for questions related to this announcement:
https://ibm.com/support/
For information on how to securely verify AIX security bulletins and fixes:
https://www.ibm.com/support/pages/node/6985269
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
https://aix.software.ibm.com/aix/efixes/security/systems_p_os_aix_security_pubkey.txt
To verify the AIX/VIOS security bulletin:
Published advisory OpenSSL signature file location:
https://aix.software.ibm.com/aix/efixes/security/aixwindows_advisory.asc.sig
openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]
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 denial of service due
to AIXWindows (CVE-2023-45172)
https://www.ibm.com/support/pages/node/7099314
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Mon Dec 18 09:23:16 CST 2023
===============================================================================
*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.
6.2 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%