Security Bulletin: IBM MQ and IBM MQ Appliance are vulnerable to a denial of service attack within the TLS key renegotiation functions (CVE-2019-4055)

Summary

A vulnerability was discovered within the TLS key renegotiation functions which could be exploited to execute a denial of service attack against an IBM MQ queue manager.

Vulnerability Details

CVEID: CVE-2019-4055 DESCRIPTION: IBM MQ is vulnerable to a denial of service attack within the TLS key renegotiation function.
CVSS Base Score: 7.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/156564&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

IBM MQ and IBM MQ Appliance V8

versions 8.0.0.0 - 8.0.0.10

IBM MQ V9 LTS

versions 9.0.0.0 - 9.0.0.5

IBM MQ_and IBM MQ Appliance _V9.1 LTS

versions 9.1.0.0 - 9.1.0.1

IBM MQ_and IBM MQ Appliance _V9.1 CD

versions 9.1.0 - 9.1.1

Remediation/Fixes

IBM MQ and IBM MQ Appliance V8

Apply fix pack 8.0.0.11

IBM MQ V9 LTS

Apply fix pack 9.0.0.6

IBM MQ_and IBM MQ Appliance _V9.1 LTS

Apply fix pack 9.1.0.2

IBM MQ_and IBM MQ Appliance _V9.1 CD

Upgrade to version 9.1.2

Workarounds and Mitigations

None