Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Websphere Application Server shipped with Tivoli Netcool/Impact. (CVE-2015-4000)

Summary

IBM WebSphere Application Server is shipped as a component of Tivoli Netcool Impact . Information about a security vulnerability affecting IBM WebSphere Application Server has been published in a security bulletin.

For Tivoli Netcool/Impact version 7.1.0 the shipped archive version of Websphere Liberty Profile does not provide updated Java SDKs, which will be required for the fix. Fix Pack 7.1.0-TIV-NCI-FP0003 will provide the updated Java SDK instead, for Tivoli Netcool/Impact version 7.1.0.

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

Remediation/Fixes

Fix will be available bundled with 7.1.0-TIV-NCI-FP0003.

<http://www.ibm.com/support/docview.wss?uid=swg24040149&gt;
Tivoli Impact/Netcool 6.1.x| WebSphere 7.0

Upgrade to WebSphere Application Server Fix Pack 7.0.0.31 or later then apply the interim fix below:

• Apply Interim Fix PI42778: Will upgrade you to IBM SDK, Java Technology Edition, Version 6 Service Refresh 16 Fix Pack 4 +IX90162+IV73934

See Websphere Application Server Security Bulletin for more details: <http://www-01.ibm.com/support/docview.wss?uid=swg21957980&gt;
Tivoli Impact/Netcool 5.1.x| WebSphere 6.1

Upgrade to WebSphere Application Server Fix Pack 6.1.0.47

• Then apply Interim Fix PI42779: Will upgrade you to IBM SDK, Java 2 Technology Edition, Version 5.0 Service Refresh 16 Fix Pack 11 (which includes IV73962)

See Websphere Application Server Security Bulletin for more details: <http://www-01.ibm.com/support/docview.wss?uid=swg21957980&gt;

Workarounds and Mitigations

For Tivoli Impact/Netcool version 5.1.x and 6.1.x, refer to the “Full Profile” portion in the “Workarounds and Mitigation” section of the

For Tivoli Impact/Netcool version 7.1.0 refer to the “Liberty Profile” portion in the “Workarounds and Mitigation” section of the Websphere Application Server Security Bulletin: <http://www-01.ibm.com/support/docview.wss?uid=swg21957980&gt;

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References

Complete CVSS v2 Guide
On-line Calculator v2

Off

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

*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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