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Security Bulletin: DH key exchange protocol vulnerability (“Logjam”) in IBM Java SDK affects IBM SPSS Analytic Server (CVE-2015-4000)

Security Bulletin


Vulnerabilities in SSL/TLS protocol during key exchange phase using Diffie-Hellman (DH) ciphersuite, “Logjam” attack, affects IBM Java SDK 1.6, 1.7 that is used by IBM SPSS Analytic Server.

Vulnerability Details

CVEID: CVE-2015-4000
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 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 SPSS Analytic Server 1.0.1
IBM SPSS Analytic Server



VRMFAPARRemediation/First Fix
IBM SPSS Analytic Server1.0.1PI44833IBM SPSS Analytic Server 1.0.1 Interim Fix
IBM SPSS Analytic Server2.0.0.1PI44833IBM SPSS Analytic Server Interim Fix

You should verify applying this fix does not cause any compatibility issue in your environment. 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


Get Notified about Future Security Bulletins




“Logjam” reported to IBM by The WeakDH team at

Change History

17 July 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.


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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Document Information

Modified date:
16 June 2018