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Security Bulletin: AIX is vulnerable to denial of service vulnerabilities

Security Bulletin


Summary

UPDATED: (Additional iFixes are now available for AIX 7.2 TL5 SP5, 7.3 TL0 SP2, 7.3 TL0 SP3, 7.3 TL1 SP1, and VIOS 3.1.3.21, 3.1.3.30, and 3.1.4.10. Both the original and new iFixes address the kernel security vulnerabilities mentioned in the bulletin, but the new iFixes also address the previously released HIPER bulletin: https://www.ibm.com/support/pages/node/6857545) Vulnerabilities in the AIX kernel and kernel extensions could allow a non-privileged local user to cause a denial of service (CVE-2023-45175, CVE-2023-45173, CVE-2023-45169, CVE-2023-45171).

Vulnerability Details

CVEID:   CVE-2023-45175
DESCRIPTION:   IBM AIX could allow a non-privileged local user to exploit a vulnerability in the TCP/IP kernel extension to cause a denial of service.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/267973 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:   CVE-2023-45173
DESCRIPTION:   IBM AIX could allow a non-privileged local user to exploit a vulnerability in the NFS kernel extension to cause a denial of service.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/267971 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:   CVE-2023-45169
DESCRIPTION:   IBM AIX could allow a non-privileged local user to exploit a vulnerability in the pmsvcs kernel extension to cause a denial of service.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/267967 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:   CVE-2023-45171
DESCRIPTION:   IBM AIX could allow a non-privileged local user to exploit a vulnerability in the kernel to cause a denial of service.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/267969 for the current score.
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

Affected Product(s)Version(s)
AIX7.2
AIX7.3
VIOS3.1

 

The vulnerabilities in the following filesets are being addressed:

FilesetLower LevelUpper Level
bos.mp647.2.5.07.2.5.7
bos.net.nfs.client7.2.5.07.2.5.4
bos.pmapi.pmsvcs7.2.5.07.2.5.4
bos.mp647.2.5.1007.2.5.107
bos.net.nfs.client7.2.5.1007.2.5.102
bos.pmapi.pmsvcs7.2.5.1007.2.5.102
bos.mp647.2.5.2007.2.5.203
bos.net.nfs.client7.2.5.2007.2.5.201
bos.pmapi.pmsvcs7.2.5.2007.2.5.201
bos.mp647.3.0.07.3.0.5
bos.net.nfs.client7.3.0.07.3.0.3
bos.pmapi.pmsvcs7.3.0.07.3.0.3
bos.mp647.3.1.07.3.1.3
bos.net.nfs.client7.3.1.07.3.1.1
bos.pmapi.pmsvcs7.3.1.07.3.1.1

 

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/Fixes

A. APARS

            

IBM has assigned the following APARs to this problem:

 

For kernel:

AIX LevelAPARSP
7.2.5IJ48608SP07
7.3.0IJ48735N/A
7.3.1IJ48618SP03

 

VIOS LevelAPARFP
3.1.3IJ49202N/A
3.1.4IJ486083.1.4.30

 

For NFS kernel extension:

AIX LevelAPARSP
7.2.5IJ48671SP07
7.3.0IJ48741N/A
7.3.1IJ48725SP03

 

VIOS LevelAPARFP
3.1.3IJ49533N/A
3.1.4IJ486713.1.4.30

 

For pmsvcs kernel extension:

AIX LevelAPARSP
7.2.5IJ48663SP07
7.3.0IJ48737N/A
7.3.1IJ48724SP03

 

VIOS LevelAPARFP
3.1.3IJ49534N/A
3.1.4IJ486633.1.4.30

 

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.

 

An LPAR system reboot is required to complete the iFix installation, or Live Update may be used on AIX 7.2 and 7.3 to avoid a reboot.

 

The AIX and VIOS fixes can be downloaded via https from:

https://aix.software.ibm.com/aix/efixes/security/kernel_fix6.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.

 

For kernel:

AIX LevelInterim Fix
7.2.5.5IJ48608m5a.231219.epkg.Z
7.2.5.5 (with HIPER)IJ48608m5b.240109.epkg.Z
7.2.5.6IJ48608s6a.230926.epkg.Z
7.3.0.2IJ48735m2a.231219.epkg.Z
7.3.0.2 (with HIPER)IJ48735m2b.240109.epkg.Z
7.3.0.3IJ48735m3a.231219.epkg.Z
7.3.0.3 (with HIPER)IJ48735m3b.240109.epkg.Z
7.3.0.4IJ48735s4a.230926.epkg.Z
7.3.1.1IJ48618m1a.231219.epkg.Z
7.3.1.1 (with HIPER)IJ48618m1b.240109.epkg.Z
7.3.1.2IJ48618m2a.231213.epkg.Z

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.

Additional iFixes are now available for AIX 7.2 TL5 SP5, 7.3 TL0 SP2, 7.3 TL0 SP3, and 7.3 TL1 SP1. Both the original and new iFixes address the kernel security vulnerabilities mentioned in the bulletin, but the new iFixes also address the previously released HIPER bulletin:

https://www.ibm.com/support/pages/node/6857545

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

 

VIOS LevelInterim Fix
3.1.3.21IJ49202m2a.231219.epkg.Z
3.1.3.21 (with HIPER)IJ49202m2b.240109.epkg.Z
3.1.3.30IJ49202m3a.231219.epkg.Z
3.1.3.30 (with HIPER)IJ49202m3b.240109.epkg.Z
3.1.3.40IJ49202s4a.231120.epkg.Z
3.1.4.10IJ48608m5a.231219.epkg.Z
3.1.4.10IJ48608m5b.240109.epkg.Z
3.1.4.21IJ48608s6a.230926.epkg.Z

 

Additional iFixes are now available for VIOS 3.1.3.21, 3.1.3.30, and 3.1.4.10. Both the original and new iFixes address the kernel security vulnerabilities mentioned in the bulletin, but the new iFixes also address the previously released HIPER bulletin:

https://www.ibm.com/support/pages/node/6857545

 

For NFS kernel extension:

AIX LevelInterim Fix
7.2.5.5IJ48671s6a.230927.epkg.Z
7.2.5.6IJ48671s6a.230927.epkg.Z
7.3.0.2IJ48741m2a.231219.epkg.Z
7.3.0.3IJ48741s4a.230927.epkg.Z
7.3.0.4IJ48741s4a.230927.epkg.Z
7.3.1.1IJ48725s1a.230927.epkg.Z
7.3.1.2IJ48725s2a.230927.epkg.Z

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.

 

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

 

VIOS LevelInterim Fix
3.1.3.21IJ49533m4a.231219.epkg.Z
3.1.3.30IJ49533s4a.231219.epkg.Z
3.1.3.40IJ49533s4a.231219.epkg.Z
3.1.4.10IJ48671s6a.230927.epkg.Z
3.1.4.21IJ48671s6a.230927.epkg.Z

 

For pmsvcs kernel extension:

AIX LevelInterim Fix
7.2.5.5IJ48663s5a.230926.epkg.Z
7.2.5.6IJ48663s6a.230926.epkg.Z
7.3.0.2IJ48737s3a.230926.epkg.Z
7.3.0.3IJ48737s3a.230926.epkg.Z
7.3.0.4IJ48737s4a.230926.epkg.Z
7.3.1.1IJ48724s1a.230926.epkg.Z
7.3.1.2IJ48724s2a.230926.epkg.Z

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.

 

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

 

VIOS LevelInterim Fix
3.1.3.21IJ49534s3a.231213.epkg.Z
3.1.3.30IJ49534s3a.231213.epkg.Z
3.1.3.40IJ49534s4a.231213.epkg.Z
3.1.4.10IJ48663s5a.230926.epkg.Z
3.1.4.21IJ48663s6a.230926.epkg.Z

 

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_advisory5.asc

            https://www.ibm.com/support/pages/node/6847947

 

To extract the fixes from the tar file:

 

tar xvf kernel_fix6.tar

cd kernel_fix6

 

Verify you have retrieved the fixes intact:

The checksums below were generated using the "openssl dgst -sha256 [filename]" command as the following:

 

openssl dgst -sha256filename
14a2616e3ee20b13704f7b6244f21a65a97cb7c22a478de8a37c49e0a726f3c1IJ48608m5a.231219.epkg.Z
504bfc2d18d39a34ddfd2bf95066c655cab1760cc69ae8d27fe199018410d0b6IJ48608s6a.230926.epkg.Z
5325363a718af21758d3db4f9e004aab9cb7db59ba1fae726fda8be079a6ef1dIJ48618m2a.231213.epkg.Z
03f36890c2f06b06e7ef3f7736f6d2c67cc3e9847ef170df12275a3ffa02188bIJ48618m2a.231213.epkg.Z
e8ef4c651fb5c5ffa3452a9135eff0904579147f39fe44cf488c6806b0069645IJ48663s5a.230926.epkg.Z
0c53da3000a1158e0e36891573c0986a05af7c426b8496dae19929ed3189039aIJ48663s6a.230926.epkg.Z
25e99fc40a69b6c94a44642ca7e1e4fa1517f290cd7a2dcb0cb584f8d4efd531IJ48671s6a.230927.epkg.Z
ff4c8e410754616aa60578db18982d12f9775aa7015e80351371e0133d4f4aebIJ48724s1a.230926.epkg.Z
1a8e0bcf106f604ac204ff050ae1933d044ddc48d5995ce2364f43baf8512abbIJ48724s2a.230926.epkg.Z
076ad4485ddda4ae60bc56799fd3584ca1b7252e47a7388c0be9d56c9af4de46IJ48725s1a.230927.epkg.Z
2b603d5feace28bd2691bd1025947fa10d35e3518c10372bb930bfebd70d1e42IJ48725s2a.230927.epkg.Z
11b28e5fc179cbee7cb0e21974c6eaef791a07fdda7ae785cb3c5c6d460ace88IJ48735m2a.231219.epkg.Z
85f90a1b1a5b269eb0fb7d45d816ccf1d3e5b39f04e110c0e52febfc13723422IJ48735m3a.231219.epkg.Z
14083e78d269db481cffff4046999533316dd36a21428dfe23786812025eefb2IJ48735s4a.230926.epkg.Z
6833da6ce8cd21e3bb2d914808ee1fa9b5c7469e52eca0e4fe969947caf50d09IJ48737s3a.230926.epkg.Z
e5b7cd0ad9ae96b8602b346c0199e5cca6ebd615d6a5612c59c013528c8226c1IJ48737s4a.230926.epkg.Z
3e88d8817eb9b2f6ea65f6a13042084bf2dcc3a24244e224cc556945ff3829d4IJ48741m2a.231219.epkg.Z
4d77c6f5b0d7750cb9e975687f543f546ab0f254fa348762a0dc8e7f201d1d7dIJ48741s4a.230927.epkg.Z
8027088069553ae29915bb2538d11a0801852593a45f406efd78af8d9b50b67cIJ49202m2a.231219.epkg.Z
11ffb27f618daeefa56479deeb18bf288e9891939c9c3adb71b02395fbf14779IJ49202m3a.231219.epkg.Z
20744ab276c2a697f626c2e3fae22277788c4484afc363558afcf59fbed118d6IJ49202s4a.231120.epkg.Z
1af23035e03a182e6d5fc7ce8954beb68bffca8f38bd5bd7605eb9fb418d0edaIJ49533m4a.231219.epkg.Z
f678a37fc3b4dfbb2065e6f56899f1d557f1ab89e26c00aaa13077bfb08e694dIJ49533s4a.231219.epkg.Z
05d659a6dfcefbb229c0b4e66ed3a5059a5af16798a693428c1d3fef22bd9e5cIJ49534s3a.231213.epkg.Z
83ba604135873bdbe4da6f4b920412d5ad7085880aa88bc91ffdbae266d49b56IJ49534s4a.231213.epkg.Z
84b15a61968e044f945d958d5b305fc20f73668a2961387d24f935bfd7132284IJ48608m5b.240109.epkg.Z
71e5fd327d1517c966294ff0e2b322c1fb3aa4438830604641ddd80f1211bcffIJ48618m1b.240109.epkg.Z
0857cbef40761609ff33a317c7c57973c8fab055a1eecab21f442b593f96d4e0IJ48735m2b.240109.epkg.Z
cd338323e6a33dc4eede3c64ddef25fe398c9390101a1d7bbd499d5a9b5ca10cIJ48735m3b.240109.epkg.Z
d7032908befad9f9e94cc975989c5f68fb343ee23c43c1483114c63194663827IJ49202m2b.240109.epkg.Z
5c76faab2340058ae3d4a9ec8db5e89cb3582fe6c431949b8cc3b8b7cb9f5981IJ49202m3b.240109.epkg.Z

 

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/kernel_advisory6.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 and 7.3 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:

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

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References

Complete CVSS v3 Guide
On-line Calculator v3

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Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

AIX Security Bulletin (ASCII format)

 

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_…

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/kernel_advisory6.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.

Acknowledgement

Change History

09 Jan 2024: Additional iFixes are now available for AIX 7.2 TL5 SP5, 7.3 TL0 SP2, 7.3 TL0 SP3, 7.3 TL1 SP1, and VIOS 3.1.3.21, 3.1.3.30, and 3.1.4.10. Both the original and new iFixes address the kernel security vulnerabilities mentioned in the bulletin, but the new iFixes also address the previously released HIPER bulletin: https://www.ibm.com/support/pages/node/6857545
04 Jan 2024: Initial Publication

*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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Document Information

Modified date:
10 January 2024

UID

ibm17105282

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