IBM SECURITY ADVISORY First Issued: Mon Sep 12 13:12:47 CDT 2022 |Updated: Mon Oct 10 14:29:18 CDT 2022 |Update: Corrected the affected upper fileset levels for VIOS 3.1.2.30 and | 3.1.2.40. Added iFixes with the correct prereqs for VIOS 3.1.2.30 and | 3.1.2.40. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.asc https://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.asc ftp://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.asc Security Bulletin: AIX is vulnerable to a privilege escalation vulnerability (CVE-2022-34356) =============================================================================== SUMMARY: A vulnerability in the AIX kernel could allow a non-privileged local user to obtain root privileges. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2022-34356 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-34356 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-34356 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in the AIX kernel to obtain root privileges. CVSS Base Score: 8.4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/230502 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.mp64 7.1.5.0 7.1.5.46 key_w_fs bos.mp64 7.2.4.0 7.2.4.10 key_w_fs | bos.mp64 7.2.5.0 7.2.5.5 key_w_fs bos.mp64 7.2.5.100 7.2.5.105 key_w_fs bos.mp64 7.3.0.0 7.3.0.3 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.mp64 REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- 7.1.5 IJ41688 ** SP11 key_w_apar 7.2.4 IJ41706 ** N/A key_w_apar 7.2.5 IJ41396 ** SP05 key_w_apar 7.3.0 IJ41687 ** SP03 key_w_apar VIOS Level APAR Availability SP KEY ---------------------------------------------------- 3.1.1 IJ41706 ** N/A key_w_apar 3.1.2 IJ41795 ** 3.1.2.50 key_w_apar 3.1.3 IJ41685 ** 3.1.3.30 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/pages/apar/IJ41396 http://www.ibm.com/support/pages/apar/IJ41685 http://www.ibm.com/support/pages/apar/IJ41687 http://www.ibm.com/support/pages/apar/IJ41688 http://www.ibm.com/support/pages/apar/IJ41706 http://www.ibm.com/support/pages/apar/IJ41795 https://www.ibm.com/support/pages/apar/IJ41396 https://www.ibm.com/support/pages/apar/IJ41685 https://www.ibm.com/support/pages/apar/IJ41687 https://www.ibm.com/support/pages/apar/IJ41688 https://www.ibm.com/support/pages/apar/IJ41706 https://www.ibm.com/support/pages/apar/IJ41795 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. 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 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/kernel_fix4.tar http://aix.software.ibm.com/aix/efixes/security/kernel_fix4.tar https://aix.software.ibm.com/aix/efixes/security/kernel_fix4.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 ---------------------------------------------- 7.1.5.8 IJ41688m8a.220921.epkg.Z key_w_fix 7.1.5.9 IJ41688m9a.220822.epkg.Z key_w_fix 7.1.5.9 IJ41688m9b.220822.epkg.Z key_w_fix | 7.1.5.10 IJ41688sAa.220913.epkg.Z key_w_fix 7.2.4.4 IJ41706m4a.220812.epkg.Z key_w_fix 7.2.4.5 IJ41706m5a.220810.epkg.Z key_w_fix 7.2.4.6 IJ41706s6a.220912.epkg.Z key_w_fix 7.2.5.2 IJ41795m2a.220812.epkg.Z key_w_fix 7.2.5.3 IJ41685m3a.220810.epkg.Z key_w_fix 7.2.5.3 IJ41685m3b.220812.epkg.Z key_w_fix 7.2.5.4 IJ41685s4a.220809.epkg.Z key_w_fix 7.3.0.1 IJ41687m1a.220810.epkg.Z key_w_fix 7.3.0.2 IJ41687s2a.220809.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. IJ41688m9a is for AIX 7100-05-09 with bos.mp64 fileset level 7.1.5.45. IJ41688m9b is for AIX 7100-05-09 with bos.mp64 fileset level 7.1.5.44. IJ41685m3a is for AIX 7200-05-03 with bos.mp64 fileset level 7.2.5.103. IJ41685m3b is for AIX 7200-05-03 with bos.mp64 fileset level 7.2.5.101. Please reference the Affected Products and Version section above for help with checking installed fileset levels. VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 3.1.1.40 IJ41706m4a.220812.epkg.Z key_w_fix 3.1.1.50 IJ41706m5a.220810.epkg.Z key_w_fix 3.1.1.60 IJ41706s6a.220912.epkg.Z key_w_fix 3.1.2.21 IJ41795m2a.220812.epkg.Z key_w_fix | 3.1.2.30 IJ41795m3a.221010.epkg.Z key_w_fix | 3.1.2.40 IJ41795s4a.221010.epkg.Z key_w_fix 3.1.3.10 IJ41685m3b.220812.epkg.Z key_w_fix 3.1.3.14 IJ41685m3a.220810.epkg.Z key_w_fix 3.1.3.21 IJ41685s4a.220809.epkg.Z key_w_fix The fixes are cumulative and address previously issued AIX/VIOS kernel security bulletins with respect to SP and TL, which includes: https://aix.software.ibm.com/aix/efixes/security/kernel_advisory3.asc https://www.ibm.com/support/pages/node/6558948 https://aix.software.ibm.com/aix/efixes/security/kernel_advisory2.asc https://www.ibm.com/support/pages/node/6483875 https://aix.software.ibm.com/aix/efixes/security/trace_advisory.asc https://www.ibm.com/support/pages/node/6464369 To extract the fixes from the tar file: tar xvf kernel_fix4.tar cd kernel_fix4 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 ----------------------------------------------------------------------------------------------------- 782b9fa7c622a94f3cd27fda5549ed0499a95ffe710f8f281341c083e48318e7 IJ41685m3a.220810.epkg.Z key_w_csum 570207b39bc06daa4b8ecc1cacfb18c88ea67b11b0e446d68e0aacea7a0a0787 IJ41685m3b.220812.epkg.Z key_w_csum 24279e267c3b984a5bcbb1e49b889859214849a1abd46480062a92e89c9888d3 IJ41685s4a.220809.epkg.Z key_w_csum 04d0d828773808e3e43242f27bd69cdce7c97d5f6e100a3816a91b835e40f19d IJ41687m1a.220810.epkg.Z key_w_csum 5988765d4dbc0da7a3b5955d319a6521657dba3eafcc5b18169d5c3387276297 IJ41687s2a.220809.epkg.Z key_w_csum | 5ce59e86e384190a64f5acb5d53f5fe538e02da995af5c7353b82de303c690d2 IJ41688sAa.220913.epkg.Z key_w_csum f210a097a8e7ed79379ac7da6e55a41467d024caae3a0af779f8f77582a72953 IJ41688m8a.220921.epkg.Z key_w_csum 486e456306ffb0beedc58b67914b4f5e064f755e2f59ec2d677e0900166ed160 IJ41688m9a.220822.epkg.Z key_w_csum 866637d1012c63d91e789f517e40f43cfe28844486fe9ad9f9a5b3d5e98788b5 IJ41688m9b.220822.epkg.Z key_w_csum f3129d961a5bcc3710329086455008f8911c17d011ce1cbdc55933cf4876ca68 IJ41706m4a.220812.epkg.Z key_w_csum 623335ceb612732f3fad2b0acdb2d5df69ce3d6fc89ae5ceccc757155eebbb06 IJ41706m5a.220810.epkg.Z key_w_csum a67081a0bb4f1713ad8ed03ee798f12fdb7b25e09d36df47d73fe0a15cb993a6 IJ41706s6a.220912.epkg.Z key_w_csum bcef535a8809cfb9bd34777e186ba489d49ac561e53620287016427ae5d919b0 IJ41795m2a.220812.epkg.Z key_w_csum | d00aeb521e931d5ea5b12f5bc12a9f344e28a464fb4e5a111c116beba6cbc486 IJ41795m3a.221010.epkg.Z key_w_csum | 67369d2d6df04fec8979b6d3d68dc94f5fbb5f44f7b5b3ba792a3b6f72f531d7 IJ41795s4a.221010.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/kernel_advisory4.asc.sig https://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/kernel_advisory4.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 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: AIX is vulnerable to a privilege escalation vulnerability (CVE-2022-34356) https://www.ibm.com/support/pages/node/6619721 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Mon Sep 12 13:12:47 CDT 2022 | Updated: Mon Oct 10 14:29:18 CDT 2022 | Update: Corrected the affected upper fileset levels for VIOS 3.1.2.30 and | 3.1.2.40. Added iFixes with the correct prereqs for VIOS 3.1.2.30 and | 3.1.2.40. =============================================================================== *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.