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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Vulnerability in Diffie-Hellman ciphers
affects InfoSphere Streams (CVE-2015-4000)
15 June 2015
AusCERT Security Bulletin Summary
Product: IBM InfoSphere Streams
Operating System: Linux variants
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2015-4000
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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects InfoSphere
More support for:
1.2, 2.0, 3.0, 3.1, 3.2, 3.2.1, 4.0
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key
exchange protocol affects InfoSphere Streams.
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
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Affected Products and Versions
126.96.36.199 and earlier
188.8.131.52 and earlier
184.108.40.206 and earlier
220.127.116.11 and earlier
18.104.22.168 and earlier
Java technology is used for SSL/TLS in InfoSphere Streams. The Diffie-Hellman
Logjam Attack for SSL/TLS vulnerability in Streams can be corrected by
disabling use of the Diffie-Hellman ciphers. This is possible for Streams
versions using Java 7 or 8. Apply the appropriate remediation documented
Version 4.0.0.x: Perform the mitigation steps for Java 7 referenced in the
Workarounds and Mitigations section below.
Version 3.2.1.x: Perform the mitigation steps for Java 7 referenced in the
Workarounds and Mitigations section below.
Version 3.1.0.x: Contact IBM Technical Support
Version 3.0.0.x: Contact IBM Technical Support
Versions 1.0 and 2.0: Upgrade to the latest version of InfoSphere Streams for
which these fixes have been released.
For assistance performing an upgrade contact IBM Technical Support.
Customers who cannot upgrade and need to secure their installation should open
a PMR with IBM Technical Support and request assistance securing their
InfoSphere Streams system against the vulnerabilities identified in this
Workarounds and Mitigations
Customers using Streams versions 3.2.1 or 22.214.171.124 should disable the use of
Diffie-Hellman ciphers (DH, DHE) by editing the java.security file and adding
or updating the entry for the jdk.tls.disabledAlgorithms property with
"DH,DHE". If the documented mitigation for the Bar Mitzvah attack
vulnerability has previously been implemented the line will, at a minimum,
The java.security file is located in <STREAMS_INSTALL>/java/jre/lib/security.
Insure that the line is not commented (does not begin with the "#" symbol).
Restart all domains and instances for this change to take effect.
You should verify applying this configuration change does not cause any
compatibility issues. Not disabling the Diffie-Hellman 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 Diffie-Hellman cipher and take appropriate
mitigation and remediation actions.
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Complete CVSS Guide
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IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Bar Mitzvah vulnerability
Reported to IBM by The WeakDH team at https://weakdh.org
15 June 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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