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

Security Bulletin


Summary

UPDATED Sep 13 (Added iFix information for 7.1 TL5 SP10 and 7.2 TL4 SP6): 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 
7.1.5.10 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
7.2.4.6 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
7.2.5.4 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
3.1.1.60 IJ39875s5a.220506.epkg.Z
3.1.2.10 IJ39878s2a.220506.epkg.Z
3.1.2.21 IJ39878s2a.220506.epkg.Z
3.1.2.30 IJ39878s2a.220506.epkg.Z
3.1.2.40 IJ39878s2a.220506.epkg.Z
3.1.3.10 IJ39876s3a.220506.epkg.Z
3.1.3.14 IJ39876s3a.220506.epkg.Z
3.1.3.21 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

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References

Complete CVSS v3 Guide
On-line Calculator v3

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Review this information as needed, no action required.

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

AIX Security Bulletin (ASCII format)

Acknowledgement

Change History

13 Sep 2022: Added iFix information for 7.1 TL5 SP10 and 7.2 TL4 SP6.
17 Jun 2022: Added iFix information for 7.2 TL5 SP4 and 7.3 TL0 SP1.
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

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location

Worldwide

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Document Information

Modified date:
20 October 2022

UID

ibm16594859

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