ESB-2018.0551 - IBM z/TPF: Access privileged data - Remote/unauthenticated 2018-02-23

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0551
                       Security patch for IBM z/TPF
                             23 February 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM z/TPF
Publisher:         IBM
Operating System:  IBM z/OS
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-3737  

Reference:         ASB-2018.0026
                   ESB-2017.3144.2

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=swg22013681

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Security Bulletin: z/TPF is affected by the OpenSSL error state security
vulnerability

Document information

Software version: 1.1 
Operating system(s): z/TPF 
Reference #: 2013681 
Modified date: 21 February 2018

Summary

z/TPF has addressed the OpenSSL error state mechanism security bypass
vulnerability.

Vulnerability Details

CVEID: CVE-2017-3737
DESCRIPTION: OpenSSL could allow a remote attacker to bypass security
restrictions, caused by a flaw in the \"error state\" mechanism when directly
calling SSL_read() or SSL_write() for an SSL object after receiving a fatal
error. An attacker could exploit this vulnerability to bypass the decryption or
encryption process and perform unauthorized actions.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
136077 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

z/TPF Enterprise Edition Version 1.1.13 - 1.1.14

Remediation/Fixes

+---------------------------------------------------------------------------+
|Product  |VRMF              |APAR         |Remediation/First Fix           |
|---------+------------------+-------------+--------------------------------|
|z/TPF    |1.1.13 - 1.1.14   |APAR PJ45174 |Apply the APAR.                 |
+---------------------------------------------------------------------------+


Workarounds and Mitigations

None.

Important note

IBM strongly suggests that all System z customers be subscribed to the System z
Security Portal to receive the latest critical System z security and integrity
service. If you are not subscribed, see the instructions on the System z
Security web site. Security and integrity APARs and associated fixes will be
posted to this portal. IBM suggests reviewing the CVSS scores and applying all
security or integrity fixes as soon as possible to minimize any potential risk.

Change History

21 February 2018: Original version published

*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.

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