Security Bulletin
Summary
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM Cognos Business Intelligence
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
IBM Cognos Business Intelligence Server 10.2.2
IBM Cognos Business Intelligence Server 10.2.1.1
IBM Cognos Business Intelligence Server 10.2
IBM Cognos Business Intelligence Server 10.1.1
IBM Cognos Business Intelligence Server 10.1
IBM Cognos Business Intelligence Server 8.4.1
Remediation/Fixes
None
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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Important Note
IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.
References
Acknowledgement
Reported to IBM by The WeakDH team at https://weakdh.org
Change History
11 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.
Disclaimer
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
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Document Information
Modified date:
15 June 2018
UID
swg21959671