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AUSCERT External Security Bulletin Redistribution
ESB-2015.1513
The Diffie-Hellman vulnerability known as Logjam in Apache Tomcat may
affect IBM WebSphere Application Server Community Edition (CVE-2015-4000)
11 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM WebSphere Application Server Community Edition
Publisher: IBM
Operating System: AIX
Linux variants
Solaris
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2015-4000
Reference: ESB-2015.1510
ESB-2015.1486
ESB-2015.1470
ESB-2015.1469
ESB-2015.1466
ESB-2015.1463
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=swg21959539
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The Diffie-Hellman vulnerability known as Logjam in Apache Tomcat may affect
IBM WebSphere Application Server Community Edition (CVE-2015-4000)
Security Bulletin
Document information
More support for:
WebSphere Application Server Community Edition
Tomcat
Software version:
3.0.0.4
Operating system(s):
AIX, Linux, Solaris, Windows
Software edition:
Elite, Enhanced, Entry
Reference #:
1959539
Modified date:
2015-06-10
Summary
Apache Tomcat which is shipped with WebSphere Application Server Community
Edition (WASCE) 3.0.0.4 is vulnerable to Diffie-Hellman vulnerability known as
Logjam
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 Application Server Community Edition 3.0.0.4
Remediation/Fixes
Tomcat provide a choice for SSL implementation:(refer to
https://tomcat.apache.org/tomcat-7.0-doc/ssl-howto.html)
1. the JSSE implementation provided as part of the Java runtime (since 1.4)
2. the APR implementation, which uses the OpenSSL engine by default.
Per JSSE:
Specify the cipher suites in the server.xml file as below if your JDK is
vulnerable to Diffie-Hellman vulnerability known as Logjam :
<Connector
ciphers="TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_SHA256,TLS_ECDHE_RSA_WITH_AES_128_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_SHA,TLS_ECDHE_RSA_WITH_AES_256_SHA384,TLS_ECDHE_ECDSA_WITH_AES_256_SHA384,TLS_ECDHE_RSA_WITH_AES_256_SHA,TLS_ECDHE_ECDSA_WITH_AES_256_SHA,TLS_DHE_RSA_WITH_AES_128_SHA256,TLS_DHE_RSA_WITH_AES_128_SHA,TLS_DHE_DSS_WITH_AES_128_SHA256,TLS_DHE_RSA_WITH_AES_256_SHA256,TLS_DHE_DSS_WITH_AES_256_SHA,TLS_DHE_RSA_WITH_AES_256_SHA"
/>
Per OpenSSL:
Add !DHE:!EDH to disable DHE/EDH and remove any lines that explicitly enable
DHE/EDH
i.e. old
SSLCipherSuite ALL:!ADH:!RC4:+HIGH:+MEDIUM:!LOW:!SSLv2:!SSLv3:!EXPORT:DHE:EDH
new
ALL:!ADH:!RC4:+HIGH:+MEDIUM:!LOW:!SSLv2:!SSLv3:!EXPORT:!DHE:!EDH
Check with openssl ciphers -V command to make sure DHE/EDH are disabled. See
http://www.openssl.org/docs/apps/ciphers.html for more detail on the syntax of
cipher suite configuration
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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
Change History
8th June 2015: original document 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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