20 April 2015
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1079 Security Bulletin: Vulnerability in RC4 stream cipher affects Sterling External Authentication Server (CVE-2015-2808) 20 April 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Sterling External Authentication Server Publisher: IBM Operating System: AIX HP-UX Linux variants Solaris Windows Impact/Access: Access Privileged Data -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2015-2808 Reference: 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=swg21882991 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in RC4 stream cipher affects Sterling External Authentication Server (CVE-2015-2808) Security Bulletin Document information More support for: Sterling Secure Proxy External Authentication Server Software version: 3.3.1, 3.4, 3.4.1, 3.4.2 Operating system(s): AIX, HP-UX, Linux, Solaris, Windows Reference #: 1882991 Modified date: 2015-04-17 Summary The RC4 Bar Mitzvah Attack for SSL/TLS affects Sterling External Authentication Server. 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 Sterling External Authentication Server 18.104.22.168 (GA Version) Sterling External Authentication Server 22.214.171.124 through 126.96.36.199 iFix 4 Sterling External Authentication Server 188.8.131.52 through 184.108.40.206 iFix 6 Sterling External Authentication Server 220.127.116.11 through 18.104.22.168 iFix 5 Remediation/Fixes None Workarounds and Mitigations To disable the RC4 ciphers in the Sterling External Authentication Server (SEAS), do the following: Bring up the SEAS Webstart GUI configurator. - - Navigate to Manage --> System Settings -> SSL o Remove the ciphers which include RC4 in the name. o Click OK to save 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 Change History 17 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. 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