CVE-2022-22444: Security Bulletin: AIX is vulnerable to a denial of service due to lpd (CVE-2022-22444)

Security Bulletin

Summary

A vulnerability in the AIX lpd printer daemon could allow a local user with elevated privileges to cause a denial of service (CVE-2022-22444). The lpd daemon is the remote print server on AIX.

Vulnerability Details

CVEID: CVE-2022-22444
DESCRIPTION: IBM AIX could allow a local user to exploit a vulnerability in the lpd daemon to cause a denial of service.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/224444 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)

AIX

7.1

AIX

7.2

AIX

7.3

VIOS

3.1

The following fileset levels are vulnerable:

Fileset

Lower Level

Upper Level

bos.rte.printers

7.1.5.0

7.1.5.33

bos.rte.printers

7.2.4.0

7.2.4.1

bos.rte.printers

7.2.5.0

7.2.5.1

bos.rte.printers

7.2.5.100

7.2.5.100

bos.rte.printers

7.3.0.0

7.3.0.0

To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in the AIX user’s guide.

Example: lslpp -L | grep -i bos.rte.printers

Remediation/Fixes

A. APARS

IBM has assigned the following APARs to this problem:

AIX Level

APAR

SP

7.1.5

IJ39868

SP11

7.2.4

IJ39875

N/A

7.2.5

IJ39876

SP05

7.3.0

IJ39877

SP03

VIOS Level

APAR

SP

3.1.1

IJ39875

N/A

3.1.2

IJ39878

3.1.2.50

3.1.3

IJ39876

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.

The fixes can be downloaded via ftp or http from:

The links above are 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

7.1.5.7

IJ39868s9a.220506.epkg.Z

7.1.5.8

IJ39868s9a.220506.epkg.Z

7.1.5.9

IJ39868s9a.220506.epkg.Z

7.2.4.3

IJ39875s5a.220506.epkg.Z

7.2.4.4

IJ39875s5a.220506.epkg.Z

7.2.4.5

IJ39875s5a.220506.epkg.Z

7.2.5.1

IJ39878s2a.220506.epkg.Z

7.2.5.2

IJ39878s2a.220506.epkg.Z

7.2.5.3

IJ39876s3a.220506.epkg.Z

7.3.0.1

IJ39877s1a.220506.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.

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

VIOS Level

Interim Fix

3.1.1.30

IJ39875s5a.220506.epkg.Z

3.1.1.40

IJ39875s5a.220506.epkg.Z

3.1.1.50

IJ39875s5a.220506.epkg.Z

3.1.2.10

IJ39878s2a.220506.epkg.Z

3.1.2.21

IJ39878s2a.220506.epkg.Z

3.1.3.10

IJ39876s3a.220506.epkg.Z

3.1.3.14

IJ39876s3a.220506.epkg.Z

The fixes are cumulative and address the previously issued AIX/VIOS lpd security bulletin with respect to SP and TL:

To extract the fixes from the tar file:

tar xvf lpd_fix2.tar

cd lpd_fix2

Verify you have retrieved the fixes intact:

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

openssl dgst -sha256

filename

fd40be548a713f51b98071baeb9cb93926b35a0cf88c9f0745ae244491bddb19

IJ39868s9a.220506.epkg.Z

f4fc2b2abcb42a6b300ab60ee74ed3aae1ebfc8099feb76e3fbdcbefc2499ff7

IJ39875s5a.220506.epkg.Z

e5e36e1cb37f18a65f123d1ed4b32b6d160d5ef3ae9feb387f856019a0a4d58e

IJ39876s3a.220506.epkg.Z

dca78408a41d7d963555cd58dbbb206a3bc0edb20bb90f93aae62d6fe408a888

IJ39877s1a.220506.epkg.Z

e0d4d6c095c36c32bc65bb8c2183f9826a36a1467d26c1e455408a50f91e9a7b

IJ39878s2a.220506.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 AIX Support at https://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

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

Review this information as needed, no action required.

Change History

14 Jun 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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