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AUSCERT External Security Bulletin Redistribution
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
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
CVE Names: CVE-2015-2808
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Security Bulletin: Vulnerability in RC4 stream cipher affects IBM DataPower
Gateway Appliances (CVE-2015-2808)
More support for:
IBM DataPower Gateways
5.0.0, 6.0.0, 6.0.1, 7.0.0, 7.1
The RC4 Bar Mitzvah Attack for SSL/TLS affects IBM DataPower Gateway
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
All DataPower products and versions that are configured to perform SSL/TLS
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
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
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Complete CVSS Guide
On-line Calculator V2
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
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.
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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