Security Bulletin: IBM MQ AMQP channels fail to block connections restricted by SSLPEER setting (CVE-2020-4320)

Summary

An error was found within the SSLPEER logic within a AMQP channel that meant it would not block/allow certificates as expected.

Vulnerability Details

CVEID:CVE-2020-4320
**DESCRIPTION:**IBM MQ Appliance, IBM MQ, AMQP Channels do not correctly block or allow clients based on the certificate distinguished name SSLPEER setting.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/177403 for the current score.
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

Remediation/Fixes

IBM MQ and IBM MQ Appliance V8
Apply FixPack 8.0.0.15

IBM MQ V9 LTS
Apply FixPack 9.0.0.10

IBM MQ and IBM MQ Appliance V9.1 LTS
Apply FixPack 9.1.0.5

IBM MQ and IBM MQ Appliance V9.1 CD
Apply FixPack 9.1.5

Workarounds and Mitigations

None