CVE-2022-34356: Security Bulletin: AIX is vulnerable to a privilege escalation vulnerability (CVE-2022-34356)

Security Bulletin

Summary

UPDATED Sep 13 (Added iFix information for 7.1 TL5 SP10): A vulnerability in the AIX kernel could allow a non-privileged local user to obtain root privileges (CVE-2022-34356).

Vulnerability Details

CVEID: 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 Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s)

Version(s)

AIX

7.1

AIX

7.2

AIX

7.3

VIOS

3.1

The vulnerabilities in the following filesets are being addressed:

Fileset

Lower Level

Upper Level

bos.mp64

7.1.5.0

7.1.5.45

bos.mp64

7.2.4.0

7.2.4.10

bos.mp64

7.2.5.0

7.2.5.3

bos.mp64

7.2.5.100

7.2.5.105

bos.mp64

7.3.0.0

7.3.0.3

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:

AIX Level

APAR

SP

7.1.5

IJ41688

SP11

7.2.4

IJ41706

N/A

7.2.5

IJ41396

SP05

7.3.0

IJ41687

SP3

VIOS Level

APAR

SP

3.1.1

IJ41706

N/A

3.1.2

IJ41795

3.1.2.50

3.1.3

IJ41685

3.1.3.30

Subscribe to the APARs here:

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:

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

7.1.5.8

IJ41688m8a.220822.epkg.Z

7.1.5.9

IJ41688m9a.220822.epkg.Z

7.1.5.9

IJ41688m9b.220822.epkg.Z

7.1.5.10

IJ41688sAa.220913.epkg.Z

7.2.4.4

IJ41706m4a.220812.epkg.Z

7.2.4.5

IJ41706m5a.220810.epkg.Z

7.2.4.6

IJ41706s6a.220912.epkg.Z

7.2.5.2

IJ41795m2a.220812.epkg.Z

7.2.5.3

IJ41685m3a.220810.epkg.Z

7.2.5.3

IJ41685m3b.220812.epkg.Z

7.2.5.4

IJ41685s4a.220809.epkg.Z

7.3.0.1

IJ41687m1a.220810.epkg.Z

7.3.0.2

IJ41687s2a.220809.epkg.Z

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

3.1.1.40

IJ41706m4a.220812.epkg.Z

3.1.1.50

IJ41706m5a.220810.epkg.Z

3.1.1.60

IJ41706s6a.220912.epkg.Z

3.1.2.21

IJ41795m2a.220812.epkg.Z

3.1.2.30

IJ41795m2a.220812.epkg.Z

3.1.2.40

IJ41795m2a.220812.epkg.Z

3.1.3.10

IJ41685m3b.220812.epkg.Z

3.1.3.14

IJ41685m3a.220810.epkg.Z

3.1.3.21

IJ41685s4a.220809.epkg.Z

The fixes are cumulative and address previously issued AIX/VIOS kernel security bulletins with respect to SP and TL, which includes:

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

782b9fa7c622a94f3cd27fda5549ed0499a95ffe710f8f281341c083e48318e7

IJ41685m3a.220810.epkg.Z

570207b39bc06daa4b8ecc1cacfb18c88ea67b11b0e446d68e0aacea7a0a0787

IJ41685m3b.220812.epkg.Z

24279e267c3b984a5bcbb1e49b889859214849a1abd46480062a92e89c9888d3

IJ41685s4a.220809.epkg.Z

04d0d828773808e3e43242f27bd69cdce7c97d5f6e100a3816a91b835e40f19d

IJ41687m1a.220810.epkg.Z

5988765d4dbc0da7a3b5955d319a6521657dba3eafcc5b18169d5c3387276297

IJ41687s2a.220809.epkg.Z

0c71df2a323848053037910021bfa903d014446ebcc2221dcc68e28b6fc35c5e

IJ41688m8a.220822.epkg.Z

486e456306ffb0beedc58b67914b4f5e064f755e2f59ec2d677e0900166ed160

IJ41688m9a.220822.epkg.Z

866637d1012c63d91e789f517e40f43cfe28844486fe9ad9f9a5b3d5e98788b5

IJ41688m9b.220822.epkg.Z

5ce59e86e384190a64f5acb5d53f5fe538e02da995af5c7353b82de303c690d2

IJ41688sAa.220913.epkg.Z

f3129d961a5bcc3710329086455008f8911c17d011ce1cbdc55933cf4876ca68

IJ41706m4a.220812.epkg.Z

623335ceb612732f3fad2b0acdb2d5df69ce3d6fc89ae5ceccc757155eebbb06

IJ41706m5a.220810.epkg.Z

a67081a0bb4f1713ad8ed03ee798f12fdb7b25e09d36df47d73fe0a15cb993a6

IJ41706s6a.220912.epkg.Z

bcef535a8809cfb9bd34777e186ba489d49ac561e53620287016427ae5d919b0

IJ41795m2a.220812.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:

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:

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

References

Off

Change History

13 Sep 2022: Added iFix information for 7.1 TL5 SP10
12 Sep 2022: 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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