IBM SECURITY ADVISORY First Issued: Fri May 13 09:32:08 CDT 2022 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/openssl_advisory35.asc https://aix.software.ibm.com/aix/efixes/security/openssl_advisory35.asc ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory35.asc Security Bulletin: AIX is vulnerable to a denial of service due to OpenSSL (CVE-2022-0778) =============================================================================== SUMMARY: A vulnerability in OpenSSL could allow a remote attacker to cause a denial of service (CVE-2022-0778). OpenSSL is used by AIX as part of AIX's secure network communications. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2022-0778 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0778 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-0778 DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by a flaw in the BN_mod_sqrt() function when parsing certificates. By using a specially-crafted certificate with invalid explicit curve parameters, a remote attacker could exploit this vulnerability to cause an infinite loop, and results in a denial of service condition. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/221911 for the current score CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 7.1, 7.2, 7.3 VIOS 3.1 The following fileset levels are vulnerable: key_fileset = osrcaix Fileset Lower Level Upper Level KEY ------------------------------------------------------ openssl.base 1.0.2.500 1.0.2.2103 key_w_fs openssl.base 1.1.1.0 1.1.1.1200 key_w_fs openssl.base 1.1.2.0 1.1.2.1200 key_w_fs openssl.base 20.13.102.1000 20.16.102.2104 key_w_fs Note: A. 0.9.8, 1.0.1 OpenSSL versions are out-of-support. Customers are advised to upgrade to currently supported OpenSSL 1.0.2 or 1.1.1 version. B. Latest level of OpenSSL fileset is available from the web download site: https://www-01.ibm.com/marketing/iwm/iwm/web/pickUrxNew.do?source=aixbp&S_PKG=openssl To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in the AIX user's guide. Example: lslpp -L | grep -i openssl.base REMEDIATION: A. FIXES IBM strongly recommends addressing the vulnerability now. The fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/openssl_fix35.tar http://aix.software.ibm.com/aix/efixes/security/openssl_fix35.tar https://aix.software.ibm.com/aix/efixes/security/openssl_fix35.tar The links above are 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. Note that the tar file contains Interim fixes that are based on OpenSSL version, and AIX OpenSSL fixes are cumulative. If an OpenSSL fileset with VMRF higher than the affected level listed above is available from the web download site, then that fileset is the recommended remediation. The OpenSSL 1.0.2 version shared objects provided in the library of OpenSSL 1.1.1 version is remediated. You must be on the 'prereq for installation' level before applying the interim fix. This may require installing a new level(prereq version) first. AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY --------------------------------------------------------------------------------------- 7.1, 7.2, 7.3 1022103a.220422.epkg.Z openssl.base(1.0.2.2103) key_w_fix 7.1, 7.2, 7.3 1111200a.220422.epkg.Z openssl.base(1.1.1.1200) key_w_fix 7.1, 7.2, 7.3 1121200a.220422.epkg.Z openssl.base(1.1.2.1200) key_w_fix 7.1, 7.2, 7.3 fips2104a.220425.epkg.Z openssl.base(20.16.102.2104) key_w_fix VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY --------------------------------------------------------------------------------------- 3.1.x 1022103a.220422.epkg.Z openssl.base(1.0.2.2103) key_w_fix 3.1.x 1111200a.220422.epkg.Z openssl.base(1.1.1.1200) key_w_fix 3.1.x 1121200a.220422.epkg.Z openssl.base(1.1.2.1200) key_w_fix 3.1.x fips2104a.220425.epkg.Z openssl.base(20.16.102.2104) key_w_fix To extract the fixes from the tar file: tar xvf openssl_fix35.tar cd openssl_fix35 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 [file]" command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- 18dc7901557a9249bf76e37f06568d955e6a63a90c8a879834c0c740ba0e20ac 1022103a.220422.epkg.Z key_w_csum 50060448815fa08b46d05836f2f8d461241c62918ceac3c0f557bbacbf87efea 1111200a.220422.epkg.Z key_w_csum 5b9509e918843b919090aa03188e0f7c5eb037f22289c9b9ccbb135a590c5ae8 1121200a.220422.epkg.Z key_w_csum bad5185dd22201101b37d103f3f16a9ecb92f2eab939ba5ad46da7efc152c7a6 fips2104a.220425.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 AIX Support at https://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/openssl_advisory35.asc.sig https://aix.software.ibm.com/aix/efixes/security/openssl_advisory35.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory35.asc.sig B. FIX AND INTERIM FIX INSTALLATION 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 https://www.ibm.com/support/mynotifications To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq https://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: Review this information as needed, no action required. Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide https://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 https://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: Security Bulletin: AIX is vulnerable to a denial of service due to OpenSSL (CVE-2022-0778) https://www.ibm.com/support/pages/node/6586112 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Fri May 13 09:32:08 CDT 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.