IBM Support

Security Bulletin: Vulnerability with Diffie-Hellman ciphers may affect server products in WebSphere Dynamic Process Edition (CVE-2015-4000)

Created by Jens Engelke on
Published URL:
https://www.ibm.com/support/pages/node/528333
528333

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 following security bulletins 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

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References

Complete CVSS v2 Guide
On-line Calculator v2

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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
2015-07-30: added link for WebSphere Integration Developer

*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

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

[{"Product":{"code":"SSBN76","label":"WebSphere Dynamic Process Edition"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Component":"General","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"}],"Version":"7.0.1.1;7.0.1;7.0.0.3;7.0.0.2;7.0.0.1;7.0;6.2;6.1.2","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
15 June 2018

UID

swg21959107

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