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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.0986
           Security Bulletin: Vulnerability in RC4 stream cipher
         affects IBM DataPower Gateway Appliances (CVE-2015-2808)
                               15 April 2015

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM DataPower Gateways
Publisher:         IBM
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2015-2808  

Reference:         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
                   ESB-2015.0944.2

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21702165

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Security Bulletin: Vulnerability in RC4 stream cipher affects IBM DataPower 
Gateway Appliances (CVE-2015-2808)

Security Bulletin

Document information

More support for:

IBM DataPower Gateways

General

Software version:

5.0.0, 6.0.0, 6.0.1, 7.0.0, 7.1

Operating system(s):

Firmware

Reference #:

1702165

Modified date:

2015-04-10

Summary

The RC4 Bar Mitzvah Attack for SSL/TLS affects IBM DataPower Gateway 
Appliances.

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

All DataPower products and versions that are configured to perform SSL/TLS 
transactions.

Remediation/Fixes

None

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 
below:

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 
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

Acknowledgement

None

Change History

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.

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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