IBM SECURITY ADVISORY First Issued: Tue Nov 16 13:44:43 CST 2021 |Updated: Fri Mar 17 11:52:34 CDT 2023 |Update: Corrected the affected upper fileset levels for AIX 7.1 TL5 | to show that SP11 is affected. Added iFix for 7.1 TL5 SP11. The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc https://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc Security Bulletin: Vulnerability in EFS affects AIX (CVE-2021-29861) =============================================================================== SUMMARY: There is a vulnerability in EFS that affects AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2021-29861 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29861 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29861 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in EFS to expose sensitive information. CVSS Base Score: 6.2 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/206085 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:N/A:N) AFFECTED PRODUCTS AND VERSIONS: AIX 7.1, 7.2 VIOS 3.1 The vulnerabilities in the following filesets are being addressed: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- | bos.rte.security 7.1.5.0 7.1.5.39 key_w_fs bos.rte.security 7.2.3.0 7.2.3.20 key_w_fs bos.rte.security 7.2.4.0 7.2.4.3 key_w_fs bos.rte.security 7.2.5.0 7.2.5.1 key_w_fs bos.rte.security 7.2.5.100 7.2.5.100 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.security REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- | 7.1.5 IJ35780 ** SP12 key_w_apar 7.2.4 IJ35226 ** SP05 key_w_apar 7.2.5 IJ35078 ** SP03-2147 key_w_apar VIOS Level APAR Availability SP KEY ---------------------------------------------------- 3.1.0 IJ35505 ** N/A key_w_apar 3.1.1 IJ35226 ** 3.1.1.50 key_w_apar 3.1.2 IJ35211 ** 3.1.2.30 key_w_apar 3.1.3 IJ35078 ** 3.1.3.14 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/pages/apar/IJ35780 http://www.ibm.com/support/pages/apar/IJ35505 http://www.ibm.com/support/pages/apar/IJ35226 http://www.ibm.com/support/pages/apar/IJ35078 http://www.ibm.com/support/pages/apar/IJ35211 https://www.ibm.com/support/pages/apar/IJ35780 https://www.ibm.com/support/pages/apar/IJ35505 https://www.ibm.com/support/pages/apar/IJ35226 https://www.ibm.com/support/pages/apar/IJ35078 https://www.ibm.com/support/pages/apar/IJ35211 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. | For bos.rte.security levels other than 7.1.5 and 7.2.5.100, 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/efs_fix.tar http://aix.software.ibm.com/aix/efixes/security/efs_fix.tar https://aix.software.ibm.com/aix/efixes/security/efs_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 IJ35780m7a.211103.epkg.Z key_w_fix 7.1.5.8 IJ35780m8a.211103.epkg.Z key_w_fix 7.1.5.9 IJ35780m9a.211103.epkg.Z key_w_fix | 7.1.5.10 IJ35780sAa.221206.epkg.Z key_w_fix | 7.1.5.11 IJ35780mBa.230314.epkg.Z key_w_fix 7.2.4.2 IJ35226m2a.211103.epkg.Z key_w_fix 7.2.4.3 IJ35226m3a.211103.epkg.Z key_w_fix 7.2.4.4 IJ35226m4a.211103.epkg.Z key_w_fix 7.2.5.1 IJ35211m1a.211110.epkg.Z key_w_fix 7.2.5.2 IJ35211m2a.211103.epkg.Z key_w_fix 7.2.5.3 IJ35078s3a.211026.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 ----------------------------------------------- 3.1.0.40 IJ35505m5a.211103.epkg.Z key_w_fix 3.1.0.50 IJ35505m6a.211103.epkg.Z key_w_fix 3.1.0.60 IJ35505m7a.211103.epkg.Z key_w_fix 3.1.1.21 IJ35226m2a.211103.epkg.Z key_w_fix 3.1.1.25 IJ35226m2a.211103.epkg.Z key_w_fix 3.1.1.30 IJ35226m3a.211103.epkg.Z key_w_fix 3.1.1.40 IJ35226m4a.211103.epkg.Z key_w_fix 3.1.2.10 IJ35211m1a.211110.epkg.Z key_w_fix 3.1.2.21 IJ35211m2a.211103.epkg.Z key_w_fix 3.1.3.10 IJ35078s3a.211026.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf efs_fix.tar cd efs_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 ----------------------------------------------------------------------------------------------------- 236f9f4f03280e83b6cc156dee97f57f1da42979dbe7334a59bb63ca2d95f65b IJ35078s3a.211026.epkg.Z key_w_csum d41c6dae2510ad391ffc71923c258a116a3ad4caad5842e8931ef861e6d24eaf IJ35211m1a.211110.epkg.Z key_w_csum 8f31440e4a9b06e0d855f07a2c1e3dc9dd7ad797d0adae2920d86ed8195caaef IJ35211m2a.211103.epkg.Z key_w_csum cd1335dbb51457b1e461f7791791063a1298899c78cdb79cc774fd32a2680d0b IJ35226m2a.211103.epkg.Z key_w_csum fc03df67a0059d77364b21c6e97ac38feac0c5e12e3d47050894fc1a7ebd9110 IJ35226m3a.211103.epkg.Z key_w_csum e9da7ea70244f5820be59d13f17cec354efc4f86818af93d8685d8ac4dbee49c IJ35226m4a.211103.epkg.Z key_w_csum 1f0dac480fea5794a3681a269356140c90bc56b49cc8537be68d30bc9126d2b1 IJ35505m5a.211103.epkg.Z key_w_csum 3d24c82dab76677575a00ea430f67877a49120758c23709d234fed7815c087db IJ35505m6a.211103.epkg.Z key_w_csum bfe7b0dcfcd419eccc9a31b14617374036277917d0d2fa75f3208efdc4a96835 IJ35505m7a.211103.epkg.Z key_w_csum 47f4cfe646e5de7ec0c32a5bac08a72351d78a6be141b95738a56b23b03fa001 IJ35780m7a.211103.epkg.Z key_w_csum 4071590f26fcae36acaaa72d89ab29bb65995ac87ae3b0fae8828929e143dd8d IJ35780m8a.211103.epkg.Z key_w_csum 0d87647e1bdb6f0d0051016cd2cbaa0701e0c6bc877cd0f1f7956f76174f6b30 IJ35780m9a.211103.epkg.Z key_w_csum | c6a21e0d91172c4bb90fcd3935b810062a3c3a18fea1840819d01723240908c9 IJ35780sAa.221206.epkg.Z key_w_csum | ed8eb3540d7586693fbd737bec85879efd8f9b909589279830568fadf887326d IJ35780mBa.230314.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/efs_advisory.asc.sig https://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc.sig C. FIX AND INTERIM FIX INSTALLATION | For bos.rte.security levels other than 7.1.5 and 7.2.5.100, 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: Vulnerability in EFS affects AIX (CVE-2021-29861) https://www.ibm.com/support/pages/node/6516786 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Nov 16 13:44:43 CST 2021 | Updated: Tue Dec 6 13:12:12 CST 2022 | Update: Corrected the affected upper fileset levels for AIX 7.1 TL5 | to show that SP10 is affected. Added iFix for 7.1 TL5 SP10. | Updated: Fri Mar 17 11:52:34 CDT 2023 | Update: Corrected the affected upper fileset levels for AIX 7.1 TL5 | to show that SP11 is affected. Added iFix for 7.1 TL5 SP11. =============================================================================== *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.