Vulnerabilities in OpenSSL affect AIX


IBM SECURITY ADVISORY First Issued: Mon Feb 1 13:42:07 CST 2021 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/openssl_advisory32.asc https://aix.software.ibm.com/aix/efixes/security/openssl_advisory32.asc ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory32.asc Security Bulletin: Vulnerabilities in OpenSSL affect AIX (CVE-2020-1968, CVE-2020-1971) =============================================================================== SUMMARY: There are vulnerabilities in OpenSSL used by AIX. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2020-1968 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1968 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1968 DESCRIPTION: OpenSSL could allow a remote attacker to obtain sensitive information, caused by a Raccoon attack in the TLS specification. By computing the pre-master secret in connections which have used a Diffie-Hellman (DH) based ciphersuite, an attacker could exploit this vulnerability to eavesdrop on all encrypted communications sent over that TLS connection. CVSS Base Score: 3.7 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/187977 for the current score CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N) CVEID: CVE-2020-1971 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1971 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1971 DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by a NULL pointer dereference. If the GENERAL_NAME_cmp function contain an EDIPARTYNAME, an attacker could exploit this vulnerability to cause the application to crash. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/192748 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 VIOS 3.1 The following fileset levels are vulnerable: key_fileset = osrcaix Fileset Lower Level Upper Level KEY ------------------------------------------------------ openssl.base key_w_fs openssl.base 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 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 The fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/openssl_fix32.tar http://aix.software.ibm.com/aix/efixes/security/openssl_fix32.tar https://aix.software.ibm.com/aix/efixes/security/openssl_fix32.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. 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 1022100a.210112.epkg.Z openssl.base( key_w_fix 7.1, 7.2 fips2100a.210112.epkg.Z openssl.base( key_w_fix VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY -------------------------------------------------------------------------------------------- 3.1.x 1022100a.210112.epkg.Z openssl.base( key_w_fix 3.1.x fips2100a.210112.epkg.Z openssl.base( key_w_fix To extract the fixes from the tar file: tar xvf openssl_fix32.tar cd openssl_fix32 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 ----------------------------------------------------------------------------------------------------- 9ed0b809ed85e0d9d1ac751208f844d3a4531baaac2b98caf9f895e057d8b9b2 1022100a.210112.epkg.Z key_w_csum 58a6efac86f5bb6e8caa75331a412a3943b81a9eeeac3a81e5defc2442798cb1 fips2100a.210112.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 -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file> openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file> Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/openssl_advisory32.asc.sig https://aix.software.ibm.com/aix/efixes/security/openssl_advisory32.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory32.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: 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: Vulnerabilities in OpenSSL affect AIX (CVE-2020-1968, CVE-2020-1971) https://www.ibm.com/support/pages/node/6410550 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Mon Feb 1 13:42:07 CST 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.