Security Bulletin: IBM MQ Blockchain bridge is vulnerable to an issue identified in snakeyaml (CVE-2022-25857)

Summary

An issue was identified with the snakeyaml package that is used by the fabric gateway package that is used by the IBM MQ Blockchain bridge package to provide Blockchain functionality in IBM MQ.

Vulnerability Details

CVEID:CVE-2022-25857
**DESCRIPTION:**Java package org.yaml:snakeyam is vulnerable to a denial of service, caused by missing to nested depth limitation for collections. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause a denial of service.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/234864 for the current score.
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

The following installable MQ components are affected by the vulnerability:
• IBM MQ Bridge to Blockchain

If you are running any of these listed components, please apply the remediation/fixes as described below. For more information on the definitions of components used in this list see <https://www.ibm.com/support/pages/installable-component-names-used-ibm-mq-security-bulletins&gt;

Remediation/Fixes

This issue was resolved under APAR IT42280

IBM MQ version 9.2 LTS

Apply FixPack 9.2.0.7

IBM MQ Version 9.3 LTS

Apply FixPack 9.3.0.2

IBM MQ version 9.2 CD and 9.3 CD

Upgrade to IBM MQ 9.3.1.0

Workarounds and Mitigations

None