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    1.0.2.500      1.0.2.2100     key_w_fs
    openssl.base    20.13.102.1000 20.16.102.2100 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(1.0.2.2100)              key_w_fix
        7.1, 7.2       fips2100a.210112.epkg.Z  openssl.base(20.16.102.2100)          key_w_fix

        VIOS Level     Interim Fix (*.Z)             Fileset Name(prereq for installation) KEY
        --------------------------------------------------------------------------------------------
        3.1.x          1022100a.210112.epkg.Z        openssl.base(1.0.2.2100)              key_w_fix 
        3.1.x          fips2100a.210112.epkg.Z       openssl.base(20.16.102.2100)          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.

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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.