IBM SECURITY ADVISORY First Issued: Tue Jun 15 19:09:20 CDT 2021 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/trace_advisory.asc https://aix.software.ibm.com/aix/efixes/security/trace_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/trace_advisory.asc Security Bulletin: Vulnerability in the AIX trace facility (CVE-2021-29706) =============================================================================== SUMMARY: There is a vulnerability in the AIX trace facility. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2021-29706 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29706 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-201-29706 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in the trace facility to expose sensitive information or cause a denial of service. CVSS Base Score: 6.8 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/200663 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 7.1 The vulnerabilities in the following filesets are being addressed: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- bos.mp64 7.1.5.0 7.1.5.42 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 IJ32940 ** SP09 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/pages/apar/IJ32940 https://www.ibm.com/support/pages/apar/IJ32940 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 fixes are available. An LPAR system reboot is required to complete the iFix installation. The AIX fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/trace_fix.tar http://aix.software.ibm.com/aix/efixes/security/trace_fix.tar https://aix.software.ibm.com/aix/efixes/security/trace_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 ---------------------------------------------- 7.1.5.6 IJ32940m6a.210615.epkg.Z key_w_fix 7.1.5.6 IJ32940m6b.210615.epkg.Z key_w_fix 7.1.5.7 IJ32940m7a.210615.epkg.Z key_w_fix 7.1.5.7 IJ32940m7b.210615.epkg.Z key_w_fix 7.1.5.8 IJ32940s8a.210615.epkg.Z key_w_fix 7.1.5.8 IJ32940s8b.210615.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.1.5.7 is AIX 7100-05-07. NOTE: Multiple iFixes are provided for AIX 7100-05-06, 7100-05-07, and 7100-05-08. IJ32940m6a is for AIX 7100-05-06 with bos.mp64 fileset level 7.1.5.38. IJ32940m6b is for AIX 7100-05-06 with bos.mp64 fileset level 7.1.5.37. IJ32940m7a is for AIX 7100-05-07 with bos.mp64 fileset level 7.1.5.40. IJ32940m7b is for AIX 7100-05-07 with bos.mp64 fileset level 7.1.5.39. IJ32940s8a is for AIX 7100-05-08 with bos.mp64 fileset level 7.1.5.42. IJ32940s8b is for AIX 7100-05-08 with bos.mp64 fileset level 7.1.5.41. Please reference the Affected Products and Version section above for help with checking installed fileset levels. The fixes are cumulative and address previously issued AIX kernel security bulletins with respect to SP and TL, which includes: https://aix.software.ibm.com/aix/efixes/security/power9_advisory.asc https://www.ibm.com/support/pages/node/6370729 https://aix.software.ibm.com/aix/efixes/security/gencore_advisory.asc https://www.ibm.com/support/pages/node/6406022 To extract the fixes from the tar file: tar xvf trace_fix.tar cd trace_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 ----------------------------------------------------------------------------------------------------- 8876568f9b7655b79a03737de3a9b43de54c93dc9ff8da34d82abc28be288ce8 IJ32940m6a.210615.epkg.Z key_w_csum 5c56e2b9eb8338dc05ac9aefec8eaa3aaefa8be0f25a3b3171ebccd1d1f3a86b IJ32940m6b.210615.epkg.Z key_w_csum 1b46af7f440fb5ed0526a68a8d4ead487272893871859e8a85d852d656dcbb43 IJ32940m7a.210615.epkg.Z key_w_csum 13d4ca34b088f2a939461cc7b99aae70240143d1760701283428b5a36da5a5b6 IJ32940m7b.210615.epkg.Z key_w_csum 5650287a5fc28411b509d41ab852a2d5617ab7a9f3f23a4c07797bb717380960 IJ32940s8a.210615.epkg.Z key_w_csum 7408d7ff31ada51fed41de9b483522f855f160cbda816ec792ac20262644b99b IJ32940s8b.210615.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/trace_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/trace_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/trace_advisory.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/ ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Jun 15 19:09:20 CDT 2021 =============================================================================== *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.