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AUSCERT External Security Bulletin Redistribution
ESB-2015.1463
Security Bulletin: Vulnerability in Diffie-Hellman ciphers
affects IBM eDiscovery Analyzer (CVE-2015-4000)
5 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM eDiscovery Analyzer
Publisher: IBM
Operating System: AIX
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4000
Reference: ESB-2015.1455
ESB-2015.1454
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=swg21959209
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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM
eDiscovery Analyzer (CVE-2015-4000)
Document information
More support for:
eDiscovery Analyzer
Software version:
2.2.0.0, 2.2.1, 2.2.2
Operating system(s):
AIX, Windows
Reference #:
1959209
Modified date:
2015-06-04
Security Bulletin
Summary
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key
exchange protocol affects IBM eDiscovery Analyzer.
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
IBM eDiscovery Analyzer Version 2.2
IBM eDiscovery Analyzer Version 2.2.1
IBM eDiscovery Analyzer Version 2.2.2
Remediation/Fixes
None
Workarounds and Mitigations
The Logjam attack, which affects TLS connections using the Diffie-Hellman (DH)
key exchange protocol, may affect IBM eDiscovery Analyzer. In order to protect
the installation from this vulnerability, DE/DHE ciphers should be disabled.
This can be accomplished by ensuring that all of the following strings are
specified as item elements in the array under the ExcludeCipherSuites element
of Jetty.xml:
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
TLS_DHE_DSS_WITH_AES_256_CBC_SHA256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
TLS_DHE_DSS_WITH_AES_256_CBC_SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
TLS_DHE_DSS_WITH_AES_128_CBC_SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
TLS_DHE_DSS_WITH_AES_128_CBC_SHA
TLS_DHE_DSS_WITH_AES_256_GCM_SHA384
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
TLS_DHE_DSS_WITH_AES_128_GCM_SHA256
You should verify applying this configuration change does not cause any
compatibility issues. Not disabling the DH or DHE stream ciphers will expose
yourself to the Logjam attack described above. IBM recommends that you review
your entire environment to identify other areas where you have enabled the
Diffie-Hellman key-exchange protocol used in TLS and take appropriate
mitigation and remediation actions.
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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
3rd June 2015
*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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