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AUSCERT External Security Bulletin Redistribution
Security Bulletin:Vulnerability in Diffie-Hellman ciphers
affects Rational Synergy (CVE-2015-4000)
29 June 2015
AusCERT Security Bulletin Summary
Product: IBM Rational Synergy
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 Rational
More support for:
AIX, HP-UX, Linux, Solaris, Windows
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key
exchange protocol affects Rational Synergy
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
Rational Synergy release 18.104.22.168 ifix02 or earlier.
Rational Synergy release 22.214.171.124 ifix01 or earlier.
Product VRMF APAR Remediation/First Fix
Rational Synergy 7.2.0.x and 7.2.1.x N/A Replace the JRE used in Rational Synergy.
Steps to download and replace JRE in Rational Synergy:
1. Open the list of Synergy downloads on Fix Central
2. Select the SDK and Readme for Rational Synergy which
applied to your release as follows:
Note: The fix will use the following naming convention:
<V.R.M.F> -Rational-RATISYNE-JavaSE-SDK-126.96.36.199- <platform>
Where <V.R.M.F> = release & <platform> = operating system
o Rational Synergy 7.2.1 (uses 188.8.131.52 release designation)
o Rational Synergy 7.2.0 (uses 184.108.40.206 release designation)
3. Follow the steps in the Install instructions to replace the JRE.
Follow the steps in the HPUX_Install Instructions to replace the JRE if your
Synergy Platform is on HPUX
For Rational Synergy 7.1.0.x IBM recommends upgrading to a fixed, supported
version/release/platform of the product.
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.
To verify if Synergy has JRE version to address this security vulnerability:-
Open a command prompt
Go to $CCM_HOME/jre/bin folder
Execute ./java -version
Go to %CCM_HOME%\jre\bin folder
Execute java -version
If in the output version is greater than SR16 FP5 or if it is SR16 FP5, It
implies the run area has jre version that addressed this security
java version "1.6.0"
Java(TM) SE Runtime Environment (build pwi3260sr16fp5-20150602_01(SR16 FP5))
IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Windows 7 x86-32
Workarounds and Mitigations
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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
26th 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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