29 June 2015
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1682 Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects Financial Transaction Manager for Check Services and Financial Transaction Manager for Corporate Payment Services (CVE-2015-4000) 29 June 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Financial Transaction Manager Publisher: IBM Operating System: AIX Windows Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-4000 Reference: ESB-2015.1673 ESB-2015.1671 ESB-2015.1670 ESB-2015.1669 ESB-2015.1663 ESB-2015.1655 ESB-2015.1640 ESB-2015.1623 ESB-2015.1614 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21960619 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects Financial Transaction Manager for Check Services and Financial Transaction Manager for Corporate Payment Services (CVE-2015-4000) Document information More support for: Financial Transaction Manager IBM Financial Transaction Manager for Check Services Software version: 184.108.40.206 Operating system(s): AIX, Windows Reference #: 1960619 Modified date: 2015-06-26 Security Bulletin Summary The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects Financial Transaction Manager for Check Services and Financial Transaction Manager for Corporate Payment Services. 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 - - FTM for Check v220.127.116.11 - - FTM for CPS v18.104.22.168 Remediation/Fixes Product VRMF APAR Remediation/First Fix FTM for Check Services 22.214.171.124 PI43631 Apply 2.1.1-FTM-CHECK-MP-fp0009 or later. FTM for Corporate Payment 126.96.36.199 PI43632 Apply 2.1.1-FTM-CPS-MP-fp0001 or later Services 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. 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 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. 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 firstname.lastname@example.org 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. 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