Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM WebSphere Application Server shipped with Tivoli Business Service Manager. (CVE-2015-4000)

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM WebSphere Application Server shipped with Tivoli Business Service Manager.

IBM WebSphere Application Server is shipped as a component of Tivoli Business Service Manager. Information about this security vulnerability affecting IBM WebSphere Application Server has been published in a security bulletin.

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

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;
Tivoli Business Service Manager 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;

Workarounds and Mitigations

Refer to the “Full 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;