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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Cognos Metrics Manager (CVE-2015-4000)

Security Bulletin


The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM Cognos Metrics Manager.

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 Cognos Metrics Manager 10.2.2
  • IBM Cognos Metrics Manager 10.2.1
  • IBM Cognos Metrics Manager 10.2
  • IBM Cognos Metrics Manager 10.1.1
  • IBM Cognos Metrics Manager 10.1


The recommended solution is to apply the fix as soon as practical. As the fix is in a shared component across the Business Intelligence portfolio, applying the BI Interim Fix will resolve the issue. Note that the prerequisites named in the links are also satisfied by an IBM Cognos Metrics Manager install of the same version.

IBM Cognos Business Intelligence 10.2.x Interim Fixes

IBM Cognos Business Intelligence 10.1.x Interim Fixes

For IBM Cognos Metrics Manager versions before 10.1, IBM recommends upgrading to a fixed, supported version/release/platform of the product

Workarounds and Mitigations

The DH cipher suites must be disabled using Cognos Configuration by performing the following actions:

1) Start Cognos Configuration.

2) Navigate to Security/Cryptography/Cognos

3) Open the supported cipher suites selection dialog.

4) Select all cipher suites that have DH in the the name and remove them from the Current Values List. Select OK to save the new list.

5) Save and restart your service using Cognos Configuration.

You should verify applying this configuration change does not cause any compatibility issues. Not disabling the DH stream cipher 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 DH stream cipher and take appropriate mitigation and remediation actions.

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Reported to IBM by The WeakDH team at

Change History

21 August 2015: Added links to interim fixes
15 June 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:
15 June 2018