Vulnerability in OpenSSL affects AIX (CVE-2018-0737)

IBM SECURITY ADVISORY

First Issued: Mon Jul 2 11:24:30 CDT 2018

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory27.asc
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory27.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory27.asc

Security Bulletin: Vulnerability in OpenSSL affects AIX (CVE-2018-0737)

===============================================================================

SUMMARY:

There is a vulnerability in OpenSSL used by AIX.

===============================================================================

VULNERABILITY DETAILS:

CVEID: CVE-2018-0737 
https://vulners.com/cve/CVE-2018-0737
https://vulners.com/cve/CVE-2018-0737
DESCRIPTION: The OpenSSL RSA Key generation algorithm has been shown to 
be vulnerable to a cache timing side channel attack. An attacker with 
sufficient access to mount cache timing attacks during the RSA key 
generation process could recover the private key.  
CVSS Base Score: 3.3 
CVSS Temporal Score: See 
    https://exchange.xforce.ibmcloud.com/vulnerabilities/141679 
    for the current score 
CVSS Environmental Score*: Undefined
CVSS Vector:NA


AFFECTED PRODUCTS AND VERSIONS:

    AIX 5.3, 6.1, 7.1, 7.2
    VIOS 2.2.x

    The following fileset levels are vulnerable:
    
    key_fileset = osrcaix

    Fileset          Lower Level   Upper Level    KEY 
    ------------------------------------------------------
    openssl.base    1.0.2.500      1.0.2.1300     key_w_fs
    openssl.base    20.13.102.1000 20.13.102.1300 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://www14.software.ibm.com/webapp/iwm/web/reg/download.do?source=aixbp&lang=en_US&S_PKG=openssl&cp=UTF-8

    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 fix is available, and it can be downloaded from:

        https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp

        To extract the fixes from the tar file:

        For Openssl 1.0.2 version - 
        zcat openssl-1.0.2.1500.tar.Z | tar xvf -

        For 1.0.2 FIPS capable openssl version -
        zcat openssl-20.13.102.1500.tar.Z | tar xvf -
             

        IMPORTANT: If possible, it is recommended that a mksysb backup
        of the system be created.  Verify it is both bootable and
        readable before proceeding.

        Note that all the previously reported security vulnerability fixes
        are also included in above mentioned fileset level. Please refer to 
        the readme file (provided along with the fileset) for the complete
        list of vulnerabilities fixed.

        To preview the fix installation:

        installp -apYd . openssl

        To install the fix package:

        installp -aXYd . openssl
                    
        
        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_advisory27.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/openssl_advisory27.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory27.asc.sig 

        
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":

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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:

http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt
https://www.ibm.com/systems/resources/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: Vulnerability in OpenSSL affects AIX (CVE-2018-0737)
    http://www.ibm.com/support/docview.wss?uid=ibm10713441

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Mon Jul  2 11:24:30 CDT 2018

===============================================================================

*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.