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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2171
  Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM
 PureApplication System and IBM OS Images for Red Hat Linux Systems, AIX,
              and Windows-based deployments. (CVE-2015-4000)
                              20 August 2015

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

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

Product:           IBM PureApplication System
                   IBM OS Images
Publisher:         IBM
Operating System:  Network Appliance
                   AIX
                   Red Hat
                   Windows
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-4000  

Reference:         ASB-2015.0070
                   ASB-2015.0066
                   ESB-2015.2166
                   ESB-2015.2124
                   ESB-2015.2108
                   ESB-2015.2104
                   ESB-2015.2103
                   ESB-2015.2088
                   ESB-2015.2083
                   ESB-2015.2051
                   ESB-2015.2040

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21964801
   http://www-01.ibm.com/support/docview.wss?uid=swg21964797

Comment: This bulletin contains two (2) IBM security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM 
PureApplication System. (CVE-2015-4000)

Document information

More support for:

PureApplication System

Security

Software version:

2.1.0.0, 2.1.0.1, 2.1.0.2

Operating system(s):

W1500, W1700, W2500, W2700

Reference #:

1964801

Modified date:

2015-08-19

Security Bulletin

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key 
exchange protocol affects IBM PureApplication System.

Vulnerability Details

CVEID: CVE-2015-4000

DESCRIPTION: The TLS protocol could allow a remote attacker to obtain 
sensitive information, caused by the failure to properly convey a DHE_EXPORT 
ciphersuite choice. An attacker could exploit this vulnerability using 
man-in-the-middle techniques to force a downgrade to 512-bit export-grade 
cipher. Successful exploitation could allow an attacker to recover the session
key as well as modify the contents of the traffic. This vulnerability is 
commonly referred to as "Logjam".

CVSS Base Score: 4.3

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/103294 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)

Affected Products and Versions

IBM PureApplication System V2.1

Remediation/Fixes

The solution is to upgrade the IBM PureApplication System to the following fix
level:

IBM PureApplication System V2.1

Upgrade to IBM PureApplication System V2.1.0.2

You should verify applying this configuration change does not cause any 
compatibility issues. If you change the default setting after applying the 
fix, you will expose yourself to the attack described above. IBM recommends 
that you review your entire environment to identify other areas where you have
enabled the Diffie-Hellman key-exchange protocol used in TLS and take 
appropriate mitigation and remediation actions.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support 
alerts like this.

References

Complete CVSS v2 Guide

On-line Calculator v2

Related information

IBM Secure Engineering Web Portal

IBM Product Security Incident Response Blog

Acknowledgement

Reported to IBM by The WeakDH team at https://weakdh.org

Change History

19 August 2015: 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.

- ----------------------------------------------------------------------------

Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM OS 
Images for Red Hat Linux Systems, AIX, and Windows-based deployments. 
(CVE-2015-4000)

Document information

More support for:

PureApplication System

Security

Software version:

2.1.0.0, 2.1.0.1, 2.1.0.2

Operating system(s):

AIX, Linux Red Hat - xSeries, Windows

Reference #:

1964797

Modified date:

2015-08-19

Security Bulletin

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key 
exchange protocol affects IBM OS Images for Red Hat Linux Systems, AIX, and 
Windows-based deployments.

Vulnerability Details

CVEID: CVE-2015-4000

DESCRIPTION: The TLS protocol could allow a remote attacker to obtain 
sensitive information, caused by the failure to properly convey a DHE_EXPORT 
ciphersuite choice. An attacker could exploit this vulnerability using 
man-in-the-middle techniques to force a downgrade to 512-bit export-grade 
cipher. Successful exploitation could allow an attacker to recover the session
key as well as modify the contents of the traffic. This vulnerability is 
commonly referred to as "Logjam".

CVSS Base Score: 4.3

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/103294 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)

Affected Products and Versions

IBM OS Image for Red Hat Linux Systems 3.0.0.0 and earlier.

IBM OS Image for AIX Systems 2.1.1.0 and earlier.

Remediation/Fixes

Virtual machines deployed from IBM PureApplication Systems are affected. This
includes RedHat Linux, AIX-based, and Windows-based deployments. The solution
is to apply the following IBM PureApplication System fix to the deployed 
virtual machines.

Java Updates:

http://www.ibm.com/support/fixcentral/swg/quickorder?parent=PureSystems&product=ibm/WebSphere/PureApplication+System&release=All&platform=All&function=fixId&fixids=Java_Update_AIX_CVE-2015-4000,Java_Update_Windows_CVE-2015-4000,Java_Update_Linux_CVE-2015-4000&includeSupersedes=0&source=fc

1. Import the fix into the Emergency Fix catalogue.

2. For deployed instances, apply this emergency fix on the VM.

3. Restart the deployed instance after the fix is applied.

You should verify applying this configuration change does not cause any 
compatibility issues. If you change the default setting after applying the 
fix, you will expose yourself to the attack described above. IBM recommends 
that you review your entire environment to identify other areas where you have
enabled the Diffie-Hellman key-exchange protocol used in TLS and take 
appropriate mitigation and remediation actions.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support 
alerts like this.

References

Complete CVSS v2 Guide

On-line Calculator v2

Related information

IBM Secure Engineering Web Portal

IBM Product Security Incident Response Blog

Acknowledgement

Reported to IBM by The WeakDH team at https://weakdh.org

Change History

19 August 2015: 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.

- --------------------------END INCLUDED TEXT--------------------

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