15 April 2015
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.0986 Security Bulletin: Vulnerability in RC4 stream cipher affects IBM DataPower Gateway Appliances (CVE-2015-2808) 15 April 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM DataPower Gateways Publisher: IBM Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2015-2808 Reference: ESB-2015.0969 ESB-2015.0967 ESB-2015.0966 ESB-2015.0965 ESB-2015.0964 ESB-2015.0963 ESB-2015.0962 ESB-2015.0961 ESB-2015.0960 ESB-2015.0958 ESB-2015.0956 ESB-2015.0955 ESB-2015.0954 ESB-2015.0953 ESB-2015.0950.2 ESB-2015.0949.2 ESB-2015.0948.2 ESB-2015.0947.2 ESB-2015.0946.2 ESB-2015.0944.2 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21702165 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in RC4 stream cipher affects IBM DataPower Gateway Appliances (CVE-2015-2808) Security Bulletin Document information More support for: IBM DataPower Gateways General Software version: 5.0.0, 6.0.0, 6.0.1, 7.0.0, 7.1 Operating system(s): Firmware Reference #: 1702165 Modified date: 2015-04-10 Summary The RC4 Bar Mitzvah Attack for SSL/TLS affects IBM DataPower Gateway Appliances. Vulnerability Details CVEID: CVE-2015-2808 DESCRIPTION: The RC4 algorithm, as used in the TLS protocol and SSL protocol, could allow a remote attacker to obtain sensitive information. An attacker could exploit this vulnerability to remotely expose account credentials without requiring an active man-in-the-middle session. Successful exploitation could allow an attacker to retrieve credit card data or other sensitive information. This vulnerability is commonly referred to as "Bar Mitzvah Attack". CVSS Base Score: 5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/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. Remediation/Fixes None Workarounds and Mitigations Disable RC4 ciphers in DataPower configuration referring to the steps below. First make sure to Quiesce all domains and services to stop traffic to the appliance. System quiesce and unquiesce commands can be invoked by navigating to Administration --> Main --> System Control. Next, select Objects --> Crypto Configuration --> Crypto Profile in the left navigation pane. For all the crypto profile objects that are configured, in the "Configure Crypto Profile" page, "Ciphers" parameter, suffix the existing string with a value ":!RC4". Click Apply. For example, if you have a default configuration, the updates will appear as below: Default cipher string: HIGH:MEDIUM:!aNULL:!eNULL:@STRENGTH RC4 disabled cipher string: HIGH:MEDIUM:!aNULL:!eNULL:@STRENGTH:!RC4 Note that RC4 must be disabled in all the Crypto Profile objects configured in all the domains. To disable RC4 in Web Management and XML Management interfaces, refer to Disable RC4 in DataPower Web management and XML management services. If you have configured WebSphere JMS or Tibco EMS objects, refer to Disable RC4 in DataPower WebSphere Java Message Service (JMS). If you have configured WebSphere MQ objects, refer to Disable RC4 in DataPower MQ Queue Manager objects. You should verify applying this configuration change does not cause any compatibility issues. Not disabling the RC4 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 RC4 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 None Change History 10 April 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 email@example.com 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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