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AUSCERT External Security Bulletin Redistribution
ESB-2015.0999
Security Bulletin: Vulnerability in RC4 stream cipher
affects IBM CICS Transaction Gateway (CVE-2015-2808)
16 April 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM CICS Transaction Gateway
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-2015.0992
ESB-2015.0991
ESB-2015.0990
ESB-2015.0988
ESB-2015.0987
ESB-2015.0986
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
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21882564
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Security Bulletin: Vulnerability in RC4 stream cipher affects IBM CICS
Transaction Gateway (CVE-2015-2808)
Security Bulletin
Document information
More support for:
CICS Transaction Gateway
Software version:
7.2, 8.0, 8.1, 9.0, 9.1
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows
Software edition:
All
Reference #:
1882564
Modified date:
2015-04-13
Summary
The RC4 Bar Mitzvah Attack for SSL/TLS affects IBM CICS Transaction Gateway.
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
CICS Transaction Gateway for Multiplatforms and Desktop Edition V9.1 and
earlier.
Remediation/Fixes
None
Workarounds and Mitigations
The use of RC4 stream ciphers by CICS Transaction Gateway can be prevented by
configuring CICS TG to only accept more secure cipher suites, This can be done
by listing the acceptable cipher suites using the ciphersuites parameter in
the ctg.ini file, or by adding the acceptable cipher suites to the "Use only
these ciphers" suites in the "SSL settings" section of the CICS TG
configuration tool
See the CICS TG for Multiplatforms Knowledge Center for more details.
Get Notified about Future Security Bulletins
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Important note
IBM strongly suggests that all System z customers be subscribed to the System
z Security Portal to receive the latest critical System z security and
integrity service. If you are not subscribed, see the instructions on the
System z Security web site. Security and integrity APARs and associated fixes
will be posted to this portal. IBM suggests reviewing the CVSS scores and
applying all security or integrity fixes as soon as possible to minimize any
potential risk.
References
Complete CVSS Guide
On-line Calculator V2
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
*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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