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Security Bulletin: Vulnerabilities in OpenSSL affect AIX (CVE-2020-1968, CVE-2020-1971)

Description

## Summary There are vulnerabilities in OpenSSL used by AIX. ## Vulnerability Details ** CVEID: **[CVE-2020-1971](<http://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](<https://exchange.xforce.ibmcloud.com/vulnerabilities/192748>) for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) ** CVEID: **[CVE-2020-1968](<http://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](<https://exchange.xforce.ibmcloud.com/vulnerabilities/187977>) for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N) ## Affected Products and Versions Affected Product(s)| Version(s) ---|--- AIX| 7.1 AIX| 7.2 VIOS| 3.1 The following fileset levels are vulnerable: Fileset| Lower Level| Upper Level ---|---|--- openssl.base| 1.0.2.500| 1.0.2.2100 openssl.base| 20.13.102.1000| 20.13.102.2100 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](<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/Fixes **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| Fileset Name (prereq for installation) ---|---|--- 7.1, 7.2 | 1022100a.210112.epkg.Z | openssl.base (1.0.2.2100) 7.1, 7.2| fips2100a.210112.epkg.Z | openssl.base (20.16.102.2100) VIOS Level| Interim Fix| Fileset Name (prereq for installation) ---|---|--- 3.1| 1022100a.210112.epkg.Z | openssl.base (1.0.2.2100) 3.1| fips2100a.210112.epkg.Z | openssl.base (20.16.102.2100) 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 ---|--- 9ed0b809ed85e0d9d1ac751208f844d3a4531baaac2b98caf9f895e057d8b9b2 | 1022100a.210112.epkg.Z 58a6efac86f5bb6e8caa75331a412a3943b81a9eeeac3a81e5defc2442798cb1 | fips2100a.210112.epkg.Z 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.s…](<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 ## Get Notified about Future Security Bulletins Subscribe to [My Notifications](< http://www-01.ibm.com/software/support/einfo.html>) to be notified of important product support alerts like this. ### References [Complete CVSS v3 Guide](<http://www.first.org/cvss/user-guide> "Link resides outside of ibm.com" ) [On-line Calculator v3](<http://www.first.org/cvss/calculator/3.0> "Link resides outside of ibm.com" ) Off ## Related Information [IBM Secure Engineering Web Portal](<http://www.ibm.com/security/secure-engineering/bulletins.html>) [IBM Product Security Incident Response Blog](<http://www.ibm.com/blogs/psirt>) [AIX Security Bulletin (ASCII format)](<https://aix.software.ibm.com/aix/efixes/security/openssl_advisory32.asc> "AIX Security Bulletin \(ASCII format\)" ) ## Change History 12 Jan 2021: Initial Publication *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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions. ## Document Location Worldwide [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SWG10","label":"AIX"},"Component":"","Platform":[{"code":"PF002","label":"AIX"}],"Version":"7.1,7.2","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]


Affected Software


CPE Name Name Version
aix 7.1
aix 7.2

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