Vulnerability in OpenSSL affects AIX

IBM SECURITY ADVISORY

First Issued: Thu Dec 14 14:57:00 CST 2017

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory24.asc
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory24.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory24.asc

Security Bulletin: Vulnerability in OpenSSL affects AIX (CVE-2017-3735)

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

SUMMARY:

There is a vulnerability in OpenSSL used by AIX.

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

VULNERABILITY DETAILS:

CVEID: CVE-2017-3735
https://vulners.com/cve/CVE-2017-3735
https://vulners.com/cve/CVE-2017-3735
DESCRIPTION: If an X.509 certificate has a malformed IPAddressFamily 
    extension, OpenSSL could do a one-byte buffer overread. The most 
    likely result could be an erroneous display of the certificate in
    text format.
CVSS Base Score: 5.3 
CVSS Temporal Score: See 
    https://exchange.xforce.ibmcloud.com/vulnerabilities/131047 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:L/A:N)


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      1.0.2.1100     key_w_fs
    openssl.base    20.13.102.1000 20.13.102.1100 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/reg/download.do?source=aixbp&lang=en_US&S_PKG=openssl&cp=UTF-8

        To extract the fixes from the tar file:

        For Openssl 1.0.2m version - 
        zcat openssl-1.0.2.1300.tar.Z | tar xvf 
	
        For Openssl fips 1.0.2m version -
        zcat openssl-20.13.102.1300.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

        Published advisory OpenSSL signature file location:

        ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory24.asc.sig
        http://aix.software.ibm.com/aix/efixes/security/openssl_advisory24.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/openssl_advisory24.asc.sig 

        openssl dgst -sha1 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]

        openssl dgst -sha1 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file]

        
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:

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

To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team via [email protected] you
can :

    A. Download the key from our web page:

        http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
        https://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt

    B. Download the key from a PGP Public Key Server. The key ID is:

        0x28BFAA12

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

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Thu Dec 14 14:57:00 CST 2017

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

*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.