Security Bulletin: IBM MQ and IBM MQ Appliance is vulnerable to a denial of service attack caused by an authenticated user crafting a malicious message (CVE-2019-4656)

Summary

IBM MQ and IBM MQ Appliance are vulnerable to a denial of service attack that would allow an authenticated user to craft a malicious message causing a queue manager to incorrectly mark a queue as damaged, requiring a restart to continue processing against the queue.

Vulnerability Details

CVEID:CVE-2019-4656
**DESCRIPTION:**IBM MQ and IBM MQ Appliance are vulnerable to a denial of service attack that would allow an authenticated user to craft a malicious message causing a queue manager to incorrectly mark a queue as damaged, requiring a restart to continue processing against the queue.
CVSS Base score: 6.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/170967 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Remediation/Fixes

IBM WebSphere MQ V7.1
Contact IBM Support requesting a fix for APAR IT30649
IBM WepSphere MQ V7.5
Contact IBM Support requesting a fix for APAR IT30649

IBM MQ and IBM MQ Appliance V8
Apply FixPack 8.0.0.14

IBM MQ V9 LTS
Apply FixPack 9.0.0.9

IBM MQ V9.1 LTS
Apply FixPack 9.1.0.4

IBM MQ and IBM MQ Appliance V9.1 CD
Upgrade to IBM MQ 9.1.5

Workarounds and Mitigations

None