Security Bulletin: IBM MQ can cause a Denial of Service attack to connecting MQTT clients (CVE-2018-1684)

Summary

A problem within the IBM MQ MQTT Service logic could cause a denial of service attack to be executed against MQTT clients attempting to connect to the queue manager.

Vulnerability Details

CVEID: CVE-2018-1684 DESCRIPTION: IBM WebSphere MQ is vulnerable to a error with MQTT topic string publishing that can cause a denial of service attack.
CVSS Base Score: 5.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/145456&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

IBM MQ V8

IBM MQ V8 versions 8.0.0.0 - 8.0.0.10

IBM MQ V9 LTS

IBM MQ V9 LTS versions 9.0.0.0 - 9.0.0.5

IBM MQ V9 CD

IBM MQ V9 CD versions 9.0.1 - 9.0.5

IBM MQ V9.1 LTS

IBM MQ V9.1 LTS versions 9.1.0.0

Remediation/Fixes

IBM MQ V8

Apply iFix IT25490

IBM MQ V9 LTS

Apply iFix IT25490

IBM MQ V9 CD

Upgrade to IBM MQ V9.1.0 and apply iFix IT25490

IBM MQ V9.1 LTS

Apply iFix IT25490

Workarounds and Mitigations

None.