IBM SECURITY ADVISORY First Issued: Fri Mar 4 08:54:35 CST 2022 |Updated: Thu Mar 24 15:53:49 CDT 2022 |Update: New iFixes provided for all levels. The new iFixes resolve a | technical failure with the previous iFixes when running NIM commands | of extended length, resulting in a /var/adm/ras/nimsh.log error | message similar to: | error: command not allowed. Please verify NIM command The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/nimsh_advisory.asc https://aix.software.ibm.com/aix/efixes/security/nimsh_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/nimsh_advisory.asc Security Bulletin: Vulnerability in AIX nimsh (CVE-2022-22351) =============================================================================== SUMMARY: There is a vulnerability in the AIX nimsh daemon. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2022-22351 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22351 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22351 DESCRIPTION: IBM AIX could allow a non-privileged trusted host user to exploit a vulnerability in the nimsh daemon to cause a denial of service in the nimsh daemon on another trusted host. CVSS Base Score: 6.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/220396 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/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.sysmgt.nim.client 7.1.5.0 7.1.5.37 key_w_fs bos.sysmgt.nim.client 7.2.4.0 7.2.4.4 key_w_fs bos.sysmgt.nim.client 7.2.5.0 7.2.5.1 key_w_fs bos.sysmgt.nim.client 7.2.5.100 7.2.5.100 key_w_fs bos.sysmgt.nim.client 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.sysmgt.nim.client REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- 7.1.5 IJ37419 ** SP10 key_w_apar 7.2.4 IJ37705 ** SP06 key_w_apar 7.2.5 IJ36681 ** SP04 key_w_apar 7.3.0 IJ36593 ** SP02 key_w_apar VIOS Level APAR Availability SP KEY ---------------------------------------------------- 3.1.1 IJ37705 ** 3.1.1.60 key_w_apar 3.1.2 IJ37706 ** 3.1.2.40 key_w_apar 3.1.3 IJ36681 ** 3.1.3.20 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/pages/apar/IJ36593 http://www.ibm.com/support/pages/apar/IJ36681 http://www.ibm.com/support/pages/apar/IJ37419 http://www.ibm.com/support/pages/apar/IJ37705 http://www.ibm.com/support/pages/apar/IJ37706 https://www.ibm.com/support/pages/apar/IJ36593 https://www.ibm.com/support/pages/apar/IJ36681 https://www.ibm.com/support/pages/apar/IJ37419 https://www.ibm.com/support/pages/apar/IJ37705 https://www.ibm.com/support/pages/apar/IJ37706 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. The AIX and VIOS fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/nimsh_fix.tar http://aix.software.ibm.com/aix/efixes/security/nimsh_fix.tar https://aix.software.ibm.com/aix/efixes/security/nimsh_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 ---------------------------------------------- | 7.1.5.7 IJ37419m9a.220324.epkg.Z key_w_fix | 7.1.5.8 IJ37419m9a.220324.epkg.Z key_w_fix | 7.1.5.9 IJ37419m9a.220324.epkg.Z key_w_fix | 7.2.4.3 IJ37705m4a.220324.epkg.Z key_w_fix | 7.2.4.4 IJ37705m4a.220324.epkg.Z key_w_fix | 7.2.4.5 IJ37705m5a.220324.epkg.Z key_w_fix | 7.2.5.1 IJ37706m2a.220324.epkg.Z key_w_fix | 7.2.5.2 IJ37706m2a.220324.epkg.Z key_w_fix | 7.2.5.3 IJ36681m3a.220324.epkg.Z key_w_fix | 7.3.0.1 IJ36593m1a.220324.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 IJ37705m4a.220324.epkg.Z key_w_fix | 3.1.1.40 IJ37705m4a.220324.epkg.Z key_w_fix | 3.1.1.50 IJ37705m5a.220324.epkg.Z key_w_fix | 3.1.2.10 IJ37706m2a.220324.epkg.Z key_w_fix | 3.1.2.21 IJ37706m2a.220324.epkg.Z key_w_fix | 3.1.3.10 IJ36681m3a.220324.epkg.Z key_w_fix | 3.1.3.14 IJ36681m3a.220324.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf nimsh_fix.tar cd nimsh_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 ----------------------------------------------------------------------------------------------------- | 7b0c82481aa7e93dab6ec60a3723ee88d63de7a339eb1e10366e71009fe5cf64 IJ36593m1a.220324.epkg.Z key_w_csum | 98cc59b5bb5947a7f8d29ee87742ac094117844cb5b309c2b5a5d2378b727687 IJ36681m3a.220324.epkg.Z key_w_csum | 71d81e4e864e387413eb7a5421fe796f9afa3031cc413758278e093d88be7832 IJ37419m9a.220324.epkg.Z key_w_csum | 6efae17ca82b02385cf44458a79535416d4f242debbccb63eb217c96e1ebd746 IJ37705m4a.220324.epkg.Z key_w_csum | fb9c4a622a7c39ab2ddeeac2cf70ae71c9653c7cb9417cea120791803bd2426d IJ37705m5a.220324.epkg.Z key_w_csum | f6fefdf2a94ffeb0362fc54d7e61f60e4ad5412ac7e651a2ee23ffc644b5e2a0 IJ37706m2a.220324.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/nimsh_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/nimsh_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/nimsh_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: Vulnerability in AIX nimsh (CVE-2022-22351) https://www.ibm.com/support/pages/node/6561275 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Fri Mar 4 08:54:35 CST 2022 | Updated: Thu Mar 24 15:53:49 CDT 2022 | Update: New iFixes provided for all levels. The new iFixes resolve a | technical failure with the previous iFixes when running NIM commands | of extended length, resulting in a /var/adm/ras/nimsh.log error | message similar to: | error: command not allowed. Please verify NIM command =============================================================================== *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.