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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1690 Security Bulletin:Vulnerability in Diffie-Hellman ciphers affects Rational Synergy (CVE-2015-4000) 29 June 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Rational Synergy Publisher: IBM Operating System: AIX HP-UX Linux variants Solaris Windows Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-4000 Reference: ESB-2015.1688 ESB-2015.1687 ESB-2015.1685 ESB-2015.1684 ESB-2015.1683 ESB-2015.1682 ESB-2015.1673 ESB-2015.1671 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21959743 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin:Vulnerability in Diffie-Hellman ciphers affects Rational Synergy (CVE-2015-4000) Document information More support for: Rational Synergy Software version: 7.2, 7.2.1 Operating system(s): AIX, HP-UX, Linux, Solaris, Windows Reference #: 1959743 Modified date: 2015-06-26 Security Bulletin Summary The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects Rational Synergy 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 Rational Synergy release 7.2.1.3 ifix02 or earlier. Rational Synergy release 7.2.0.7 ifix01 or earlier. Remediation/Fixes 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-6.0.16.5- <platform> Where <V.R.M.F> = release & <platform> = operating system o Rational Synergy 7.2.1 (uses 7.2.1.3 release designation) Example: 7.2.1.3-Rational-RATISYNE-JavaSE-SDK-6.0.16.5-Linux o Rational Synergy 7.2.0 (uses 7.2.0.7 release designation) Example: 7.2.0.7-Rational-RATISYNE-JavaSE-SDK-6.0.16.5-Windows 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 Unix:- Go to $CCM_HOME/jre/bin folder Execute ./java -version Windows:- 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 vulnerability. Example:- 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 jvmwi3260sr16fp4-201 Workarounds and Mitigations None Get Notified about Future Security Bulletins Subscribe to My Notifications to be notified of important product support alerts like this. References Complete CVSS Guide On-line Calculator V2 Related information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog Acknowledgement Reported to IBM by The WeakDH team at https://weakdh.org Change History 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. Disclaimer 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. 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