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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2124 Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Rational RequisitePro (CVE-2015-4000) 14 August 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Rational RequisitePro Publisher: IBM Operating System: Windows Impact/Access: Provide Misleading Information -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-4000 Reference: ASB-2015.0070 ASB-2015.0066 ESB-2015.2108 ESB-2015.2104 ESB-2015.2103 ESB-2015.2088 ESB-2015.2083 ESB-2015.2054 ESB-2015.2051 ESB-2015.2040 ESB-2015.2038 ESB-2015.2027 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21960340 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Rational RequisitePro (CVE-2015-4000) Document information More support for: Rational RequisitePro SSL Software version: 7.1, 7.1.0.1, 7.1.0.2, 7.1.1, 7.1.1.1, 7.1.1.2, 7.1.1.3, 7.1.1.4, 7.1.1.5, 7.1.1.6, 7.1.1.7, 7.1.1.8, 7.1.1.9, 7.1.2, 7.1.2.1, 7.1.2.2, 7.1.2.3, 7.1.2.4, 7.1.2.5, 7.1.2.6, 7.1.2.7, 7.1.2.8, 7.1.2.9, 7.1.2.10, 7.1.2.11, 7.1.2.12, 7.1.2.13, 7.1.2.14, 7.1.2.15, 7.1.2.16, 7.1.2.17, 7.1.2.18, 7.1.3, 7.1.3.1, 7.1.3.2, 7.1.3.3, 7.1.3.4, 7.1.3.5, 7.1.3.6, 7.1.3.7, 7.1.3.8, 7.1.3.9, 7.1.3.10, 7.1.3.11, 7.1.3.12, 7.1.3.13, 7.1.3.14, 7.1.3.15, 7.1.4, 7.1.4.1, 7.1.4.2, 7.1.4.3, 7.1.4.4, 7.1.4.5, 7.1.4.6, 7.1.4.7, 7.1.4.8 Operating system(s): Windows Reference #: 1960340 Modified date: 2015-08-13 Security Bulletin Summary The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM Rational RequisitePro. 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 Rational RequisitePro, versions 7.1.0.x, 7.1.1.x, 7.1.2.x, 7.1.3.x, 7.1.4.x, in the following components: Customer defined uses of SSL from ratlperl scripts. Remediation/Fixes All fixes listed below require the latest published fix pack before applying the rest of the fix. Affected Versions Prerequisite before applying the fix 7.1.4 through 7.1.4.7 Install Rational RequisitePro Fix Pack 8 (7.1.4.8) for 7.1.4 7.1.3 through 7.1.3.14 Install Rational RequisitePro Fix Pack 15 (7.1.3.15) for 7.1.3 7.1.2.x (all fix packs) Install Rational RequisitePro Fix Pack 18 (7.1.2.18) for 7.1.2. Note: 7.1.2.18 7.1.1.x (all fix packs) interoperates with all 7.1.x.x systems, and can be installed in the same way 7.1.0.x (all fix packs) as 7.1.x.x fix packs. The solution is to update to the fix pack listed above, then contact Rational Customer Support for a test fix with additional fixes for this issue. 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. Get Notified about Future Security Bulletins Subscribe to My Notifications to be notified of important product support alerts like this. References Complete CVSS v2 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 *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. 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