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             AUSCERT External Security Bulletin Redistribution

        IBM MQ RDQM and IBM MQ Appliance are vulnerable to a denial
                     of service attack (CVE-2018-1084)
                                14 May 2019


        AusCERT Security Bulletin Summary

Product:           IBM MQ
Publisher:         IBM
Operating System:  Linux variants
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1084  

Reference:         ASB-2019.0059.2

Original Bulletin: 

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IBM MQ RDQM and IBM MQ Appliance are vulnerable to a denial of service attack

Product:             IBM MQ
Component:           RDQM
Software version:,,, 9.1.1, 9.1.2
Operating system(s): Linux
Software edition:    Advanced
Reference #:         0879045

Security Bulletin


A denial of service vulnerability was discovered within the corosync library
which is used by the RDQM feature of IBM MQ and the high availability feature
of IBM MQ Appliance.

Vulnerability Details

CVEID: CVE-2018-1084
DESCRIPTION: Corosync is vulnerable to a denial of service, caused by an
integer overflow in exec/totemcrypto.c. By sending a specially-crafted packet,
a remote attacker could exploit this vulnerability to cause the application to
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
141586 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 version 9.1 LTS
versions -

IBM MQ and IBM MQ Appliance version 9.1 CD
versions 9.1.1 - 9.1.2


IBM MQversion 9.1 LTS
Apply ifix IT28745

IBM MQ version 9.1 CD
Apply ifix IT28745

IBM MQ Appliance version 9.1 LTS
Apply ifix IT28745 , or later maintenance.

IBM MQ Appliance version 9.1 CD
Apply ifix IT28745, or later maintenance

Workarounds and Mitigations

IBM MQ RDQM is only affected when configured in a high availability (HA) group.

In most cases the IBM MQ Appliance is not affected by this issue. The exception
is when you have a high availability configuration in which the two appliances
not directly connected (that is, they are remotely situated and connected by
means of
a switch or similar).

Change History

10 May 2019: Original version published

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