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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Vulnerability in Diffie-Hellman ciphers
affects IBM Cognos Metrics Manager (CVE-2015-4000)
16 June 2015
AusCERT Security Bulletin Summary
Product: IBM Cognos Business Intelligence
Operating System: AIX
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2015-4000
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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Cognos
Metrics Manager (CVE-2015-4000)
More support for:
Cognos Business Intelligence
10.1, 10.1.1, 10.2, 10.2.1, 10.2.2
AIX, HP Itanium, HP-UX, Linux, Solaris, Windows
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key
exchange protocol affects IBM Cognos Metrics Manager.
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
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
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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Complete CVSS Guide
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IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Reported to IBM by The WeakDH team at https://weakdh.org
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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