Security Bulletin: Vulnerability with Diffie-Hellman ciphers may affect IBM WebSphere Application Server that shipped with WebSphere Enterprise Service Bus Registry Edition (CVE-2015-4000)

Summary

The LogJam Attack on Diffie-Hellman ciphers (CVE-2015-4000) may affect some configurations of IBM WebSphere Application Server that shipped with WebSphere Enterprise Service Bus Registry Edition.

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)

Remediation/Fixes

These security vulnerabilities are all fixed with available interim fixes and are targeted for specific WebSphere Application Server fix pack levels. For more information on these fixes, including workarounds and mitigations please see Security Bulletin: Vulnerability with Diffie-Hellman ciphers may affect IBM WebSphere Application Server (CVE-2015-4000)