IBM SECURITY ADVISORY First Issued: Tue Jun 14 14:27:45 CDT 2022 |Updated: Tue Sep 13 13:16:19 CDT 2022 |Update: Added iFix information for 7.1 TL5 SP10 and 7.2 TL4 SP6. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/lpd_advisory2.asc https://aix.software.ibm.com/aix/efixes/security/lpd_advisory2.asc ftp://aix.software.ibm.com/aix/efixes/security/lpd_advisory2.asc Security Bulletin: AIX is vulnerable to a denial of service due to lpd (CVE-2022-22444) =============================================================================== 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 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22444 https://cve.mitre.org/cgi-bin/cvename.cgi?name=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 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 7.1, 7.2, 7.3 VIOS 3.1 The following fileset levels are vulnerable: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- bos.rte.printers 7.1.5.0 7.1.5.33 key_w_fs bos.rte.printers 7.2.4.0 7.2.4.1 key_w_fs bos.rte.printers 7.2.5.0 7.2.5.1 key_w_fs bos.rte.printers 7.2.5.100 7.2.5.100 key_w_fs bos.rte.printers 7.3.0.0 7.3.0.0 key_w_fs 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: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- 7.1.5 IJ39868 ** SP11 key_w_apar 7.2.4 IJ39875 ** N/A key_w_apar 7.2.5 IJ39876 ** SP05 key_w_apar 7.3.0 IJ39877 ** SP03 key_w_apar VIOS Level APAR Availability SP KEY ---------------------------------------------------- 3.1.1 IJ39875 ** N/A key_w_apar 3.1.2 IJ39878 ** 3.1.2.50 key_w_apar 3.1.3 IJ39876 ** 3.1.3.30 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/pages/apar/IJ39868 http://www.ibm.com/support/pages/apar/IJ39875 http://www.ibm.com/support/pages/apar/IJ39876 http://www.ibm.com/support/pages/apar/IJ39877 http://www.ibm.com/support/pages/apar/IJ39878 https://www.ibm.com/support/pages/apar/IJ39868 https://www.ibm.com/support/pages/apar/IJ39875 https://www.ibm.com/support/pages/apar/IJ39876 https://www.ibm.com/support/pages/apar/IJ39877 https://www.ibm.com/support/pages/apar/IJ39878 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: ftp://aix.software.ibm.com/aix/efixes/security/lpd_fix2.tar http://aix.software.ibm.com/aix/efixes/security/lpd_fix2.tar https://aix.software.ibm.com/aix/efixes/security/lpd_fix2.tar 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 (*.Z) KEY ---------------------------------------------- 7.1.5.7 IJ39868s9a.220506.epkg.Z key_w_fix 7.1.5.8 IJ39868s9a.220506.epkg.Z key_w_fix 7.1.5.9 IJ39868s9a.220506.epkg.Z key_w_fix | 7.1.5.10 IJ39868s9a.220506.epkg.Z key_w_fix 7.2.4.3 IJ39875s5a.220506.epkg.Z key_w_fix 7.2.4.4 IJ39875s5a.220506.epkg.Z key_w_fix 7.2.4.5 IJ39875s5a.220506.epkg.Z key_w_fix | 7.2.4.6 IJ39875s5a.220506.epkg.Z key_w_fix 7.2.5.1 IJ39878s2a.220506.epkg.Z key_w_fix 7.2.5.2 IJ39878s2a.220506.epkg.Z key_w_fix 7.2.5.3 IJ39876s3a.220506.epkg.Z key_w_fix 7.2.5.4 IJ39876s3a.220506.epkg.Z key_w_fix 7.3.0.1 IJ39877s1a.220506.epkg.Z key_w_fix 7.3.0.2 IJ39877s1a.220506.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.5.2 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 (*.Z) KEY ----------------------------------------------- 3.1.1.30 IJ39875s5a.220506.epkg.Z key_w_fix 3.1.1.40 IJ39875s5a.220506.epkg.Z key_w_fix 3.1.1.50 IJ39875s5a.220506.epkg.Z key_w_fix 3.1.2.10 IJ39878s2a.220506.epkg.Z key_w_fix 3.1.2.21 IJ39878s2a.220506.epkg.Z key_w_fix 3.1.3.10 IJ39876s3a.220506.epkg.Z key_w_fix 3.1.3.14 IJ39876s3a.220506.epkg.Z key_w_fix 3.1.3.21 IJ39876s3a.220506.epkg.Z key_w_fix The fixes are cumulative and address the previously issued AIX/VIOS lpd security bulletin with respect to SP and TL: https://aix.software.ibm.com/aix/efixes/security/lpd_advisory.asc https://www.ibm.com/support/pages/node/6467129 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 KEY ----------------------------------------------------------------------------------------------------- fd40be548a713f51b98071baeb9cb93926b35a0cf88c9f0745ae244491bddb19 IJ39868s9a.220506.epkg.Z key_w_csum f4fc2b2abcb42a6b300ab60ee74ed3aae1ebfc8099feb76e3fbdcbefc2499ff7 IJ39875s5a.220506.epkg.Z key_w_csum e5e36e1cb37f18a65f123d1ed4b32b6d160d5ef3ae9feb387f856019a0a4d58e IJ39876s3a.220506.epkg.Z key_w_csum dca78408a41d7d963555cd58dbbb206a3bc0edb20bb90f93aae62d6fe408a888 IJ39877s1a.220506.epkg.Z key_w_csum e0d4d6c095c36c32bc65bb8c2183f9826a36a1467d26c1e455408a50f91e9a7b IJ39878s2a.220506.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 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: http://aix.software.ibm.com/aix/efixes/security/lpd_advisory2.asc.sig https://aix.software.ibm.com/aix/efixes/security/lpd_advisory2.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/lpd_advisory2.asc.sig 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: http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html 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 https://www.ibm.com/support/mynotifications To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq https://www14.software.ibm.com/webapp/set2/subscriptions/onvdq Contact IBM Support for questions related to this announcement: http://ibm.com/support/ https://ibm.com/support/ 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 Please contact your local IBM AIX support center for any assistance. REFERENCES: Review this information as needed, no action required. Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide https://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 https://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: Security Bulletin: AIX is vulnerable to a denial of service due to lpd (CVE-2022-22444) https://www.ibm.com/support/pages/node/6594859 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Jun 14 14:27:45 CDT 2022 Updated: Fri Jun 17 09:00:14 CDT 2022 Update: Added iFix information for 7.2 TL5 SP4 and 7.3 TL0 SP1. | Updated: Tue Sep 13 13:16:19 CDT 2022 | Update: Added iFix information for 7.1 TL5 SP10 and 7.2 TL4 SP6. =============================================================================== *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.