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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Vulnerability in RC4 stream cipher
affects TXSeries for Multiplatforms. (CVE-2015-2808)
20 April 2015
AusCERT Security Bulletin Summary
Product: IBM TXSeries
Operating System: AIX
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
CVE Names: CVE-2015-2808
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Security Bulletin: Vulnerability in RC4 stream cipher affects TXSeries for
More support for:
7.1, 8.1, 8.2
AIX, HP Itanium, HP-UX, Linux/x86, Solaris, Windows
The RC4 Bar Mitzvah Attack for SSL/TLS affects TXSeries for Multiplatforms.
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
CVSS Base Score: 5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the current
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Affected Products and Versions
TXSeries for Multiplatforms V7.1, V8.1 and V 8.2
Workarounds and Mitigations
TXSeries for Multiplatforms provides an optional configurable capability to
enable SSL for its IPIC communication protocol. RC4 stream cipher is enabled
in the default configuration.
TXSeries V126.96.36.199 or higher will support disabling RC4 when it is configured
with GSKit version 8.x. The instructions below provide guidance to disable RC4
TXSeries for Multiplatforms V7.1
If you are on TXSeries for Multiplatforms V7.1, you need to upgrade to Fixpack
4 or higher. Lower fix pack levels do not support disabling RC4.
Steps to disable RC4 (TXSeries V188.8.131.52 or higher)
1. Stop the TXSeries region.
2. If you have not configured your region to use GSKit version 8.x, set the
below variable in the regions environment file. CICS_GSKIT_VERSION=8
If your region is already configured with GSKit version 8.x then go to step 3.
(By Default TXSeries 7.1 support GSKit version 7.x. Refer to the TXSeries
infocenter for further configuration details.)
3. Set the below environment variable in the regions environment file.
CICS_SP800_131MODE=SP800_131MODE. This will enable SSL FIPS processing mode
which will in turn disable RC4 stream cipher.
4. Restart the TXSeries region.
TXSeries for Multiplatforms V8.1 and V8.2
Steps to disable RC4 (TXSeries V184.108.40.206 or higher)
1. Stop the TXSeries region.
2. Set the below environment variable in the regions environment file
CICS_SP800_131MODE=SP800_131MODE. This will enable FIPS processing mode which
will in turn disable RC4 stream cipher.
3. Restart the TXSeries region.
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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*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.
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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