-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.0958
           Security Bulletin: Vulnerability in RC4 stream cipher
           affects WebSphere Application Server (CVE-2015-2808)
                               14 April 2015

===========================================================================

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

Product:           IBM WebSphere Application Server
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   IBM i
                   Linux variants
                   Solaris
                   Windows
                   z/OS
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2015-2808  

Reference:         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
                   ESB-2015.0915
                   ESB-2015.0914
                   ESB-2015.0913
                   ESB-2015.0912

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21701503

- --------------------------BEGIN INCLUDED TEXT--------------------

Security Bulletin: Vulnerability in RC4 stream cipher affects WebSphere 
Application Server (CVE-2015-2808)

Security Bulletin

Document information

More support for:

WebSphere Application Server

General

Software version:

6.1, 7.0, 8.0, 8.5, 8.5.5

Operating system(s):

AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS

Software edition:

Base, Developer, Express, Liberty, Network Deployment

Reference #:

1701503

Modified date:

2015-04-13

Summary

The RC4 "Bar Mitzvah" for SSL/TLS may affect some configurations of WebSphere
Application Server. NOTE: If you are configured for FIPS140-2, Suite B or 
SP800-131 in your Security>SSL certificate and key management then you are not
affected by this vulnerability or your SSL communication for Liberty.

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

The following Versions of WebSphere Application Server may be affected:

    Version 8.5 and 8.5.5 Full Profile and Liberty Profile

    Version 8.0

    Version 7.0

    Version 6.1

Remediation/Fixes

If you are configured for FIPS140-2, Suite B or SP800-131 in your Security>SSL
certificate and key management or your SSL communication for Liberty then you
are not affected by this vulnerability.

If you use the IBM HTTP Server please refer to this bulletin Vulnerability in
RC4 stream ciphers affects IBM HTTP Server.

For ALL Versions and Editions:

The simplest way to remediate this vulnerability is to configure for 
FIPS140-2, Suite B or SP800-131 standards since these do not use RC4 stream 
ciphers. This can be configured in the Security>SSL Certificate and Key 
management. Refer to the Knowledge Center for your WebSphere Application 
Server Version for the instructions. If you are using Liberty it can be found
in the Enabling SSL configuration in the Knowledge Center. If you can not 
configure any of those standards then please refer below for your edition and
version.

For IBM WebSphere Application Server and IBM WebSphere Application Server 
Hypervisor Edition:

For V8.5.0.0 through 8.5.5.5 Full Profile:

The Interim Fix for CVE-2015-0138 already contains the update to remove 
RC4 ciphers by default. Please refer to the Security bulletin for RSA Export 
Keys (FREAK) and apply Interim Fix PI36563.

- --OR--

Follow the mitigation section to mitigate your IBM Java SDK Versions 7 or 8.

For 8.0.0.0 through 8.0.0.10:

The Interim Fix for CVE-2015-0138 already contains the update to remove 
RC4 ciphers by default. Please refer to the Security bulletin for RSA Export 
Keys (FREAK) and apply Interim Fix PI36563.

For V7.0.0.0 through 7.0.0.37:

The Interim Fix for CVE-2015-0138 already contains the update to remove 
RC4 ciphers by default. Please refer to the Security bulletin for RSA Export 
Keys (FREAK) and apply Interim Fix PI36563.

For V6.1.0.0 through 6.1.0.47:

You must remove the RC4 ciphers from your configuration. You will need to
create a "CUSTOM" list of ciphers that do not include any RC4 ciphers from 
your Application Server configuration. Please refer to the Knowledge Center 
for instructions on creating a custom cipher list.

For IBM WebSphere Application Server Liberty Profile:

For V8.5.0.0 through 8.5.5.5 Full Profile:

    Upgrade to Fix Pack 8.5.5.4 or later (RC4 ciphers were removed by default)

- -- OR--

Apply the Interim Fix PI36563 which already contains the removal of RC4 
ciphers by default. Please refer to the Security bulletin for RSA Export Keys
(FREAK) and apply Interim Fix PI36563.

- --OR--

Follow the mitigation section to mitigate your IBM SDK, Java Technology 
Edition or your Oracle Java SDK.

You should verify applying this fix does not cause any compatibility issues. 
The fix disables RC4 stream cipher by default. If you change this setting you
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.

For unsupported versions IBM recommends upgrading to a fixed, supported 
version of the product.

Workarounds and Mitigations

For the IBM SDK, Java Technology Edition that is used by IBM WebSphere 
Application Server and IBM WebSphere Application Server Hypervisor Edition:

For Java 7 or Java 8:

    Edit the java.security file and turn off RC4 by adding: 
    jdk.tls.disabledAlgorithms=SSLv3,RC4

For the IBM SDK, Java Technology Edition or Oracle Java SDK, that is used by 
IBM WebSphere Application Server Liberty Profile:

    Edit the java.security file and turn off RC4 by adding: 
    jdk.tls.disabledAlgorithms=SSLv3,RC4

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.

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

RC4 Stream Cipher Vulnerability in IBM HTTP Server

Related information

IBM Secure Engineering Web Portal

IBM Product Security Incident Response Blog

Change History

10 April 2015: original document published

13 April 2015: fix IHS link

*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.

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=rl0R
-----END PGP SIGNATURE-----