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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
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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
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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 2.4.2.0 (GA Version)
Sterling External Authentication Server 2.4.1.0 through 2.4.1.8 iFix 4
Sterling External Authentication Server 2.4.0.0 through 2.4.0.4 iFix 6
Sterling External Authentication Server 2.3.1.0 through 2.3.1.11 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.
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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.
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