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 which meant that it would not block/allow certificates as expected.

Vulnerability Details

CVEID:CVE-2020-4320
**DESCRIPTION:**IBM MQ Appliance and IBM MQ AMQP Channels 8.0, 9.0 LTS, 9.1 LTS, and 9.1 CD do not correctly block or allow clients based on the certificate distinguished name SSLPEER setting. IBM X-Force ID: 177403.
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 Appliance V8
Apply FixPack 8.0.0.15

IBM MQ Appliance V9.1 LTS
Apply FixPack 9.1.0.5

IBM MQ Appliance V9.1 CD
Apply FixPack 9.1.5

Workarounds and Mitigations

None