IBM SECURITY ADVISORY First Issued: Thu Dec 15 10:28:27 CST 2022 |Updated: Fri Mar 17 09:36:03 CDT 2023 |Update: Corrected the affected upper fileset levels for AIX 7.1 TL5 to show | that SP11 is affected. Corrected the affected upper fileset levels for | AIX 7.3 TL0 to show that SP03 is affected. Added iFixes for 7.1 TL5 SP10 | and 7.3 TL0 SP03. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/lpd_advisory3.asc https://aix.software.ibm.com/aix/efixes/security/lpd_advisory3.asc ftp://aix.software.ibm.com/aix/efixes/security/lpd_advisory3.asc Security Bulletin: AIX is vulnerable to a denial of service due to lpd (CVE-2022-43382) =============================================================================== SUMMARY: A vulnerability in the AIX lpd printer daemon could allow a local user with elevated privileges to cause a denial of service (CVE-2022-43382). The lpd daemon is the remote print server on AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2022-43382 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-43382 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-43382 DESCRIPTION: IBM AIX could allow a local user with elevated privileges 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/238641 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 7.1.5.34 key_w_fs | printers.rte 7.1.5.0 7.1.5.32 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 printers.rte 7.2.4.0 7.2.4.0 key_w_fs printers.rte 7.2.5.200 7.2.5.200 key_w_fs bos.rte.printers 7.3.0.0 7.3.0.0 key_w_fs | printers.rte 7.3.0.0 7.3.0.1 key_w_fs printers.rte 7.3.1.0 7.3.1.0 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 IJ44552 ** SP12 key_w_apar 7.2.5 IJ44559 ** SP06 key_w_apar | 7.3.0 IJ44562 ** SP04 key_w_apar 7.3.1 IJ44564 ** SP02 key_w_apar VIOS Level APAR Availability SP KEY ----------------------------------------------------- 3.1.2 IJ44615 ** 3.1.2.50 key_w_apar 3.1.3 IJ42162 ** 3.1.3.30 key_w_apar 3.1.4 IJ44559 ** 3.1.4.20 key_w_apar Subscribe to the APARs here: https://www.ibm.com/support/pages/apar/IJ42162 https://www.ibm.com/support/pages/apar/IJ42800 https://www.ibm.com/support/pages/apar/IJ44552 https://www.ibm.com/support/pages/apar/IJ44559 https://www.ibm.com/support/pages/apar/IJ44564 https://www.ibm.com/support/pages/apar/IJ44615 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_fix3.tar http://aix.software.ibm.com/aix/efixes/security/lpd_fix3.tar https://aix.software.ibm.com/aix/efixes/security/lpd_fix3.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 ---------------------------------------------- 7.1.5.8 IJ44552mAa.221208.epkg.Z key_w_fix 7.1.5.9 IJ44552mAa.221208.epkg.Z key_w_fix 7.1.5.10 IJ44552mAa.221208.epkg.Z key_w_fix | 7.1.5.11 IJ44552mBa.230313.epkg.Z key_w_fix 7.2.5.3 IJ44559m4a.221214.epkg.Z key_w_fix 7.2.5.4 IJ44559m4a.221214.epkg.Z key_w_fix 7.2.5.5 IJ44559m5a.221208.epkg.Z key_w_fix 7.3.0.1 IJ42800m2a.221208.epkg.Z key_w_fix 7.3.0.2 IJ42800m2a.221208.epkg.Z key_w_fix | 7.3.0.3 IJ44562s3a.230314.epkg.Z key_w_fix 7.3.1.1 IJ44564m1a.221208.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.5.4 is AIX 7200-05-04. Please reference the Affected Products and Version section above for help with checking installed fileset levels. VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 3.1.2.21 IJ44615m2a.221213.epkg.Z key_w_fix 3.1.2.30 IJ44615m2a.221213.epkg.Z key_w_fix 3.1.2.40 IJ44615m2a.221213.epkg.Z key_w_fix 3.1.3.10 IJ42162m4a.221208.epkg.Z key_w_fix 3.1.3.14 IJ42162m4a.221208.epkg.Z key_w_fix 3.1.3.21 IJ42162m4a.221208.epkg.Z key_w_fix 3.1.4.10 IJ44559m5a.221208.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_advisory2.asc https://www.ibm.com/support/pages/node/6594859 To extract the fixes from the tar file: tar xvf lpd_fix3.tar cd lpd_fix3 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 ----------------------------------------------------------------------------------------------------- 9dbee1f9ad2158e491a36186236a776086ae4a3e6ec65052c84688c2412bec3c IJ42162m4a.221208.epkg.Z key_w_csum 6c3b3f0c7521e46d6071fa62517173de68768487b34260b8b3641391ee194886 IJ42800m2a.221208.epkg.Z key_w_csum 29594f99310e866eaca906730d347b1a9e976212d708a3d95f6c70b517d96b23 IJ44552mAa.221208.epkg.Z key_w_csum 328df5737201ed540a0b011da0cca28a51b182286a12280a21537cff4b5638ce IJ44559m4a.221214.epkg.Z key_w_csum b7ab294f33bddb6679157b9e55d0fd3e822c8d7259e119ccc00b027a7f934642 IJ44559m5a.221208.epkg.Z key_w_csum 371bec45e77ec860b79ee3759feedf5b00ea22098c6a79ea9f51d3e0852b6888 IJ44564m1a.221208.epkg.Z key_w_csum bb941b81852b4a46944ac793173998a714d6facd8af36e0ca63f300bd3c091ef IJ44615m2a.221213.epkg.Z key_w_csum | 08d533fc0d09ca2c25d574a691409638daabe5890604871a97952d5168ea7b39 IJ44552mBa.230313.epkg.Z key_w_csum | be7585118db447ec4f99a3148d6b22b1a4de6fe2dd52ca03cb84b2c9c2c119ec IJ44562s3a.230314.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_advisory3.asc.sig https://aix.software.ibm.com/aix/efixes/security/lpd_advisory3.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/lpd_advisory3.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-2022-43382) https://www.ibm.com/support/pages/node/6848309 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Thu Dec 15 10:28:27 CST 2022 | Updated: Fri Mar 17 09:36:03 CDT 2023 | Update: Corrected the affected upper fileset levels for AIX 7.1 TL5 to show | that SP11 is affected. Corrected the affected upper fileset levels for | AIX 7.3 TL0 to show that SP03 is affected. Added iFixes for 7.1 TL5 SP10 | and 7.3 TL0 SP03. =============================================================================== *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.