IBM Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Image Construction and CompositionTool. (CVE-2015-4000) - United States  SECURITY BULLETIN

SUMMARY
 The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM Image Construction and Composition Tool. 

VULNERABILITY DETAILS
CVEID: CVE-2015-4000 [http://cve.mitre.org/cgi-bin/cvename.cgi?name=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 [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 Image Construction and Composition Tool v2.2.1.3 
IBM Image Construction and Composition Tool v2.3.1.0 
IBM Image Construction and Composition Tool v2.3.2.0

REMEDIATION/FIXES
The solution is to apply the following IBM Image Construction and Composition Tool version fixes.

Upgrade the IBM Image Construction and Composition Tool to the following fix levels:

· For IBM Image Construction and Composition Tool v2.2.1.3
· IBM Image Construction and Composition Tool v2.2.1.3 Build 32

http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=PureSystems&product=ibm/WebSphere/PureApplication+System&release=1.1.0.5&platform=All&function=fixId&fixids=ICCT_efix_Repository_2.2.1.3-32&includeSupersedes=0 [http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=PureSystems&product=ibm/WebSphere/PureApplication+System&release=1.1.0.5&platform=All&function=fixId&fixids=ICCT_efix_Repository_2.2.1.3-32&includeSupersedes=0]


· For IBM Image Construction and Composition Tool v2.3.1.0
· IBM Image Construction and Composition Tool v2.3.1.0 Build 43

http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=PureSystems&product=ibm/WebSphere/PureApplication+System&release=2.0.0.1&platform=All&function=fixId&fixids=ICCT_efix_Repository_2.3.1.0-43&includeSupersedes=0 [http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=PureSystems&product=ibm/WebSphere/PureApplication+System&release=2.0.0.1&platform=All&function=fixId&fixids=ICCT_efix_Repository_2.3.1.0-43&includeSupersedes=0]


· For IBM Image Construction and Composition Tool v2.3.2.0
· IBM Image Construction and Composition Tool v2.3.2.0 Build 16

http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=PureSystems&product=ibm/WebSphere/PureApplication+System&release=2.1.0.0&platform=All&function=fixId&fixids=ICCT_efix_Repository_2.3.2.0-16&includeSupersedes=0 [http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=PureSystems&product=ibm/WebSphere/PureApplication+System&release=2.1.0.0&platform=All&function=fixId&fixids=ICCT_efix_Repository_2.3.2.0-16&includeSupersedes=0]


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

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REFERENCES
Complete CVSS v2 Guide [http://www.first.org/cvss/v2/guide] 
On-line Calculator v2 [http://nvd.nist.gov/CVSS-v2-Calculator] 
RELATED INFORMATION
IBM Secure Engineering Web Portal [http://www.ibm.com/security/secure-engineering/bulletins.html] 
IBM Product Security Incident Response Blog [http://www.ibm.com/blogs/psirt] ACKNOWLEDGEMENT
Reported to IBM by The WeakDH team at https://weakdh.org [https://weakdh.org] 

CHANGE HISTORY
 18 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.
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CVEID: CVE-2015-4000 [http://cve.mitre.org/cgi-bin/cvename.cgi?name=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 [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)