Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Cognos Command Center (CVE-2015-4000)
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM Cognos Command Center.
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 Command Center 10.2.2
IBM Cognos Command Center 10.2.1
IBM Cognos Command Center 10.2
IBM Cognos Command Center 10.1
The recommended solution is to apply the IBM JRE 6.0 SR16FP5 to the following versions of
IBM Cognos Command Center:
- IBM Cognos Command Center 10.2.2
- IBM Cognos Command Center 10.2.1
- IBM Cognos Command Center 10.2
- IBM Cognos Command Center 10.1
The fix for all affected versions is found here: http://www.ibm.com/support/fixcentral/swg/quickorder?parent=Cognos&product=ibm/Information+Management/Cognos+Command+Center&release=10.2.2&platform=Windows+32-bit,+x86&function=fixId&fixids=10.2.2-BA-CCC-Win32-JRE-60SR16FP5
Installation instructions for applying this fix.
For Microsoft Windows servers where the Agent or Server component is installed.
- Download the 32 bit IBM Java JRE (file name: ibm-java-jre-60-win-i386.zip, Size: 75 MB).
- Stop the CccServer, CccQueue and CccAgent Microsoft Windows services.
- For IBM Cognos Command Center 10.1 and 10.2: Rename the <INSTALLDIR>\Common\java directory to <INSTALLDIR>\Common\java.orig
- For IBM Cognos Command Center 10.2.1: Rename the <INSTALLDIR>\Common\java.188.8.131.52 directory to <INSTALLDIR>\Common\java.184.108.40.206.orig
- For IBM Cognos Command Center 10.2.2: Rename the <INSTALLDIR>\Common\java.6.0.16 directory to <INSTALLDIR>\Common\java.6.0.16.orig
- For IBM Cognos Command Center 10.1 and 10.2: Unpack the content of the ibm-java-jre-60-win-i386.zip file to <INSTALLDIR>\Common\java
- For IBM Cognos Command Center 10.2.1: Unpack the content of the ibm-java-jre-60-win-i386.zip file to <INSTALLDIR>\Common\java.220.127.116.11
- For IBM Cognos Command Center 10.2.2: Unpack the content of the ibm-java-jre-60-win-i386.zip file to <INSTALLDIR>\Common\java.6.0.16
- Start the CccAgent, CccQueue and CccServer Microsoft Windows services.
- Validate the installation by testing the connectivity to the agent using the CCC Client.
For Microsoft Windows servers where the Server or Web Client component is installed apply these additional steps.
- Follow the instructions described in the Microsoft Security Bulletin MS15-055 titled "Vulnerability in Schannel Could Allow Information Disclosure (3061518)". (https://technet.microsoft.com/en-us/library/security/ms15-055.aspx)
For IBM Cognos Command Center with above fix applied: Before upgrading your installation to 10.2.2 please revert to the original \java\ or \java.18.104.22.168\ directory:
- Stop the CccServer, CccQueue and CccAgent Windows services.
- Rename the <INSTALLDIR>\Common\java (or \java.22.214.171.124) directory to <INSTALLDIR>\Common\java.cve (or \java.126.96.36.199.cve)
- Rename the <INSTALLDIR>\Common\java.orig (or java.188.8.131.52.orig) directory to <INSTALLDIR>\Common\java (or java.184.108.40.206).
- Proceed to upgrade your Cognos Command Center installation to a newer version.
- After upgrade to newer version is done, please reapply "Vulnerability in Diffie-Hellman ciphers affects IBM Cognos Command Center (CVE-2015-4000)" fix starting Step 1.
You should verify applying this configuration change does not cause any compatibility issues. 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.
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Reported to IBM by The WeakDH team at https://weakdh.org
26 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.