IBM SECURITY ADVISORY First Issued: Tue Mar 1 09:31:15 CST 2022 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/caa_advisory2.asc https://aix.software.ibm.com/aix/efixes/security/caa_advisory2.asc ftp://aix.software.ibm.com/aix/efixes/security/caa_advisory2.asc Security Bulletin: Vulnerabilities in AIX CAA (CVE-2022-22350, CVE-2021-38996) =============================================================================== SUMMARY: There are multiple vulnerabilities in AIX CAA. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2022-22350 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22350 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22350 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in CAA to cause a denial of service. CVSS Base Score: 6.2 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/220394 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) CVEID: CVE-2021-38996 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38996 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38996 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in the AIX kernel to cause a denial of service. CVSS Base Score: 6.2 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/213076 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 vulnerabilities in the following filesets are being addressed: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- bos.cluster.rte 7.1.5.0 7.1.5.38 key_w_fs bos.cluster.rte 7.2.4.0 7.2.4.4 key_w_fs bos.cluster.rte 7.2.5.0 7.2.5.1 key_w_fs bos.cluster.rte 7.2.5.100 7.2.5.101 key_w_fs bos.cluster.rte 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 AIX user's guide. Example: lslpp -L | grep -i bos.cluster.rte REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- 7.1.5 IJ37355 ** SP10 key_w_apar 7.2.4 IJ37496 ** SP06 key_w_apar 7.2.5 IJ36682 ** SP04 key_w_apar 7.3.0 IJ36596 ** SP02 key_w_apar VIOS Level APAR Availability SP KEY ---------------------------------------------------- 3.1.1 IJ37496 ** 3.1.1.60 key_w_apar 3.1.2 IJ37512 ** 3.1.2.40 key_w_apar 3.1.3 IJ36682 ** 3.1.3.20 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/pages/apar/IJ36596 http://www.ibm.com/support/pages/apar/IJ36682 http://www.ibm.com/support/pages/apar/IJ37355 http://www.ibm.com/support/pages/apar/IJ37496 http://www.ibm.com/support/pages/apar/IJ37512 https://www.ibm.com/support/pages/apar/IJ36596 https://www.ibm.com/support/pages/apar/IJ36682 https://www.ibm.com/support/pages/apar/IJ37355 https://www.ibm.com/support/pages/apar/IJ37496 https://www.ibm.com/support/pages/apar/IJ37512 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 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 and 7.3 to avoid a reboot. The AIX and VIOS fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/caa_fix2.tar http://aix.software.ibm.com/aix/efixes/security/caa_fix2.tar https://aix.software.ibm.com/aix/efixes/security/caa_fix2.tar 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 (*.Z) KEY ---------------------------------------------- 7.1.5.7 IJ37355s7a.220228.epkg.Z key_w_fix 7.1.5.8 IJ37355s8a.220228.epkg.Z key_w_fix 7.1.5.9 IJ37355s9a.220228.epkg.Z key_w_fix 7.1.5.9 IJ37355s9b.220228.epkg.Z key_w_fix 7.2.4.3 IJ37496s3a.220228.epkg.Z key_w_fix 7.2.4.4 IJ37496s4a.220228.epkg.Z key_w_fix 7.2.4.5 IJ37496s5a.220228.epkg.Z key_w_fix 7.2.5.1 IJ37512s1a.220228.epkg.Z key_w_fix 7.2.5.2 IJ37512s2a.220228.epkg.Z key_w_fix 7.2.5.3 IJ36682s3a.220228.epkg.Z key_w_fix 7.2.5.3 IJ36682s3b.220228.epkg.Z key_w_fix 7.3.0.1 IJ36596s1a.220228.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. NOTE: Multiple iFixes are provided for AIX 7100-05-09 and 7200-05-03. IJ37355s9a is for AIX 7100-05-09 with bos.cluster.rte fileset level 7.1.5.38. IJ37355s9b is for AIX 7100-05-09 with bos.cluster.rte fileset level 7.1.5.37. IJ36682s3a is for AIX 7200-05-03 with bos.cluster.rte fileset level 7.2.5.101. IJ36682s3b is for AIX 7200-05-03 with bos.cluster.rte fileset level 7.2.5.100. 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 IJ37496s3a.220228.epkg.Z key_w_fix 3.1.1.40 IJ37496s4a.220228.epkg.Z key_w_fix 3.1.1.50 IJ37496s5a.220228.epkg.Z key_w_fix 3.1.2.10 IJ37512s1a.220228.epkg.Z key_w_fix 3.1.2.21 IJ37512s2a.220228.epkg.Z key_w_fix 3.1.3.10 IJ36682s3b.220228.epkg.Z key_w_fix 3.1.3.14 IJ36682s3a.220228.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf caa_fix2.tar cd caa_fix2 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 KEY ----------------------------------------------------------------------------------------------------- 6e45651c382f9915771c9714b994d26a783a8caecb8e3c8b3350d981aee7349b IJ36596s1a.220228.epkg.Z key_w_csum 88a2f0bcc4b7676eab0db362fd885d360ad3a38104edbe7bed1e4c79a56be30d IJ36682s3a.220228.epkg.Z key_w_csum a81847ca47786818db8dce79f4a982c285815f561e2c9e8630840c229a27d381 IJ36682s3b.220228.epkg.Z key_w_csum b4efa8234dc00c91148c75ec25e1c5fd3cd96ec691131ece6e458e5c33591335 IJ37355s7a.220228.epkg.Z key_w_csum e141352471d842585e176bfb3ccc27289620b63de96478cca7688f4851841023 IJ37355s8a.220228.epkg.Z key_w_csum 9440584798abfa576e4e90287847f22cc9019281a213f1d289df330e75e77b56 IJ37355s9a.220228.epkg.Z key_w_csum 4d77a4e7fd8cd356deda29d6ff9a5996912ebd22e0898ede34725220d8df2577 IJ37355s9b.220228.epkg.Z key_w_csum 991ac1e17a4dd3b20feb44162b3f04a9dcda8cb2acce398e09c520b5871ccff3 IJ37496s3a.220228.epkg.Z key_w_csum a0a24034a8a2fc3f2fa4ed8e5b05da045587300708812fe5c796a41b87b8e855 IJ37496s4a.220228.epkg.Z key_w_csum 2f74bee159291cec6944f8b522dbbf086f01b65a30da76595773b5851008c0ba IJ37496s5a.220228.epkg.Z key_w_csum 95086a37dbf91e218f145c172cf2ca39029dfbecb00f072d4a36887f91536551 IJ37512s1a.220228.epkg.Z key_w_csum 9e2ecbbe30354bdd275679ac9e22ec7ca0dfb8a87cbe73f46767422b90206afd IJ37512s2a.220228.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 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: http://aix.software.ibm.com/aix/efixes/security/caa_advisory2.asc.sig https://aix.software.ibm.com/aix/efixes/security/caa_advisory2.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/caa_advisory2.asc.sig 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 and 7.3 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: 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 To view previously issued advisories, please visit: http://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: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: IBM Secure Engineering Web Portal http://www.ibm.com/security/secure-engineering/bulletins.html IBM Product Security Incident Response Blog https://www.ibm.com/blogs/psirt/ Security Bulletin: Vulnerabilities in AIX CAA (CVE-2022-22350, CVE-2021-38996) https://www.ibm.com/support/pages/node/6560390 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Mar 1 09:31:15 CST 2022 =============================================================================== *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.