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AUSCERT External Security Bulletin Redistribution
ESB-2015.1554
Security Bulletin: Vulnerability in Diffie-Hellman ciphers
affects InfoSphere Streams (CVE-2015-4000)
15 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM InfoSphere Streams
Publisher: IBM
Operating System: Linux variants
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4000
Reference: ESB-2015.1552
ESB-2015.1549
ESB-2015.1536
ESB-2015.1535
ESB-2015.1534
ESB-2015.1522
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21959676
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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects InfoSphere
Streams (CVE-2015-4000)
Document information
More support for:
InfoSphere Streams
Software version:
1.2, 2.0, 3.0, 3.1, 3.2, 3.2.1, 4.0
Operating system(s):
Linux
Reference #:
1959676
Modified date:
2015-06-12
Security Bulletin
Summary
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key
exchange protocol affects InfoSphere Streams.
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
1.2.1.0
2.0.0.4 and earlier
3.0.0.5 and earlier
3.1.0.5 and earlier
3.2.1.3 and earlier
4.0.0.1 and earlier
Remediation/Fixes
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
below.
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
Security Bulletin.
Workarounds and Mitigations
Customers using Streams versions 3.2.1 or 4.0.0.0 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,
read:
jdk.tls.disabledAlgorithms=SSLv3,RC4,DH,DHE
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.
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
Bar Mitzvah vulnerability
Acknowledgement
Reported to IBM by The WeakDH team at https://weakdh.org
Change History
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.
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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