IBM SECURITY ADVISORY First Issued: Wed Dec 14 08:27:58 CST 2022 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/rmmlcache_advisory.asc https://aix.software.ibm.com/aix/efixes/security/rmmlcache_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/rmmlcache_advisory.asc Security Bulletin: AIX is affected by a root privilege escalation vulnerability (CVE-2022-41290) =============================================================================== SUMMARY: A vulnerability in the AIX rm_mlcache_file user command could allow a non-privileged local user to obtain root privileges (CVE-2022-41290). =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2022-41290 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41290 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41290 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in the rm_mlcache_file command to obtain root privileges. CVSS Base Score: 8.4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/236690 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.rte.install 7.1.5.0 7.1.5.48 key_w_fs bos.rte.install 7.2.5.0 7.2.5.5 key_w_fs bos.rte.install 7.2.5.100 7.2.5.105 key_w_fs bos.rte.install 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.rte.install REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- 7.1.5 IJ42230 ** SP11 key_w_apar 7.2.5 IJ42163 ** SP05 key_w_apar 7.3.0 IJ42234 ** SP03 key_w_apar VIOS Level APAR Availability SP KEY ---------------------------------------------------- 3.1.2 IJ42232 ** 3.1.2.50 key_w_apar 3.1.3 IJ42163 ** 3.1.3.30 key_w_apar Subscribe to the APARs here: https://www.ibm.com/support/pages/apar/IJ42163 https://www.ibm.com/support/pages/apar/IJ42230 https://www.ibm.com/support/pages/apar/IJ42232 https://www.ibm.com/support/pages/apar/IJ42234 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 AIX and VIOS fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/rmmlcache_fix.tar http://aix.software.ibm.com/aix/efixes/security/rmmlcache_fix.tar https://aix.software.ibm.com/aix/efixes/security/rmmlcache_fix.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 IJ42230mAa.221208.epkg.Z key_w_fix 7.1.5.9 IJ42230mAa.221208.epkg.Z key_w_fix 7.1.5.10 IJ42230mAa.221208.epkg.Z key_w_fix 7.2.5.3 IJ42163m4a.221213.epkg.Z key_w_fix 7.2.5.4 IJ42163m4a.221213.epkg.Z key_w_fix 7.3.0.1 IJ42234m2a.221213.epkg.Z key_w_fix 7.3.0.2 IJ42234m2a.221213.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 IJ42232m2a.221213.epkg.Z key_w_fix 3.1.2.30 IJ42232m2a.221213.epkg.Z key_w_fix 3.1.2.40 IJ42232m2a.221213.epkg.Z key_w_fix 3.1.3.10 IJ42163m4a.221213.epkg.Z key_w_fix 3.1.3.14 IJ42163m4a.221213.epkg.Z key_w_fix 3.1.3.21 IJ42163m4a.221213.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf rmmlcache_fix.tar cd rmmlcache_fix 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 ----------------------------------------------------------------------------------------------------- 151660fafedd0bf43da9579f272cf01fa4435ae6d58a118d9628a91f1dbdfc49 IJ42163m4a.221213.epkg.Z key_w_csum 09f08f7976bb940137be2cf67362481e1b9d892b8ab02e94464fdcbd4be49e00 IJ42230mAa.221208.epkg.Z key_w_csum 9ae3e496e4017b98ff10327ad03778c45e0402a8024c33f257754a8f2bf0aaf8 IJ42232m2a.221213.epkg.Z key_w_csum 8c3a1e7a9dbb76c005158184b88fffa07b16cf3f001565578f7690fb599d9a72 IJ42234m2a.221213.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/rmmlcache_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/rmmlcache_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/rmmlcache_advisory.asc.sig C. FIX AND INTERIM FIX INSTALLATION 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 affected by a root privilege escalation vulnerability (CVE-2022-41290) https://www.ibm.com/support/pages/node/6847917 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Wed Dec 14 08:27:58 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.