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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1520 Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Datapower Gateways (CVE-2015-4000) 11 June 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM DataPower Gateways Publisher: IBM Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2015-4000 Reference: ESB-2015.1470 ESB-2015.1469 ESB-2015.1466 ESB-2015.1463 ESB-2015.1455 ESB-2015.1454 ESB-2015.1453 ESB-2015.1452 ESB-2015.1445 ESB-2015.1443 ESB-2015.1432 ESB-2015.1425 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21959060 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Datapower Gateways (CVE-2015-4000) Security Bulletin Document information More support for: IBM DataPower Gateways Software version: 6.0.0, 6.0.1, 7.0.0, 7.1 Operating system(s): Firmware Reference #: 1959060 Modified date: 2015-06-08 Summary The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM Datapower Gateways. 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 All DataPower products and versions that are configured to perform SSL/TLS transactions as a client. Remediation/Fixes None Workarounds and Mitigations DataPower appliances acting as an SSL server are not vulnerable. For appliances acting as an SSL client, disable DH ciphers in DataPower. To disable the DH ciphers in DataPower, refer to the steps below. 1. Quiesce all domains and services to stop traffic to the appliance. System quiesce and unquiesce commands can be run by navigating to Administration > Main > System Control. 2. Select Objects > Crypto Configuration > Crypto Profile in the left navigation pane. For all the crypto profiles that are configured in the Configure Crypto Profile page, suffix the existing Ciphers string with a value :!DH:!kEDH and click Apply. For example, if you have a default configuration, the updates appears as below: Default cipher string: HIGH:MEDIUM:!aNULL:!eNULL:@STRENGTH DH disabled cipher string: HIGH:MEDIUM:!aNULL:!eNULL:@STRENGTH:!DH:!kEDH Note that DH must be disabled in all the crypto profiles configured in all the domains when used in an SSL client profile. You should verify applying this configuration change does not cause any compatibility issues. Not disabling the DH stream cipher 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 DH stream cipher 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 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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