Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM MQ Light (CVE-2015-4000)

Security Bulletin

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM MQ Light.

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

The vulnerabilities affect users of IBM MQ Light V1.0 and V1.0.0.1 on all platforms.

Remediation/Fixes

Download and install the latest MQ Light Server appropriate for your platform from https://developer.ibm.com/messaging/mq-light/.

The following link describes how to re-use the data from your existing installation:
http://www.ibm.com/support/knowledgecenter/SSBJCR_1.0.0/com.ibm.mq.koa.doc/tmql_data.htm .

Workarounds and Mitigations

None

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References

Complete CVSS v2 Guide
On-line Calculator v2

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Acknowledgement

Reported to IBM by The WeakDH team at https://weakdh.org

Change History

24 July 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

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

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Tips

Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM MQ Light (CVE-2015-4000)