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AUSCERT External Security Bulletin Redistribution
ESB-2015.1455.2
Security Bulletin: Vulnerability with Diffie-Hellman ciphers may affect
server products in WebSphere Dynamic Process Edition (CVE-2015-4000)
29 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM WebSphere Dynamic Process Edition
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4000
Reference: ESB-2015.1453
ESB-2015.1452
ESB-2015.1445
ESB-2015.1443
ESB-2015.1432
ESB-2015.1425
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21959107
Revision History: June 29 2015: Explaining new Java setting replacing
the workaround
June 4 2015: Initial Release
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Security Bulletin: Vulnerability with Diffie-Hellman ciphers may affect server
products in WebSphere Dynamic Process Edition (CVE-2015-4000)
Document information
More support for:
WebSphere Dynamic Process Edition
General
Software version:
6.1.2, 6.2, 7.0, 7.0.0.1, 7.0.0.2, 7.0.0.3, 7.0.1, 7.0.1.1
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows
Reference #:
1959107
Modified date:
2015-06-26
Security Bulletin
Summary
The LogJam Attack on Diffie-Hellman ciphers (CVE-2015-4000) may affect some
configurations of IBM WebSphere Application Server Full Profile that is
shipped as a component of server products in WebSphere Dynamic Process
Edition. The IBM HTTP Server used by WebSphere Application Server is not
affected.
Vulnerability Details
CVEID: CVE-2015-4000
DESCRIPTION: The TLS protocol could allow a remote attacker to obtain
sensitive information, caused by the failure to properly convey a DHE_EXPORT
ciphersuite choice. An attacker could exploit this vulnerability using
man-in-the-middle techniques to force a downgrade to 512-bit export-grade
cipher. Successful exploitation could allow an attacker to recover the session
key as well as modify the contents of the traffic. This vulnerability is
commonly referred to as "Logjam".
CVSS Base Score: 4.3
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/103294 for the current
score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Affected Products and Versions
WebSphere Dynamic Process Edition 6.1, 6.2, 7.0
If you are using an unsupported version, IBM strongly recommends to upgrade.
Remediation/Fixes
Please consult the security bulletin Security Bulletin: Vulnerability with
Diffie-Hellman ciphers may affect IBM WebSphere Application Server
(CVE-2015-4000) for vulnerability details and information about fixes.
WebSphere Application Server is used by WebSphere Process Server, WebSphere
Business Services Fabric, and WebSphere Business Monitor.
The following setting in java.secruity allows you to reenable ciphers using DH
and DHE key exchange that you had to disable as a temporary workaround:
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize <768
Workarounds and Mitigations
None
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
Reported to IBM by The WeakDH team at https://weakdh.org
Change History
2015-06-03: inital version published
2015-06-26: explaining new Java setting replacing the workaround
*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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