Security Bulletin: IBM MQ Blockchain bridge dependencies are vulnerable to an issue in Apache Log4j (CVE-2021-45046)

Summary

A Remote Code Execution issue was identified within the Log4j fix for CVE-2021-44228 that is used by Fabric Gateway to provide logging functionality. Fabric Gateway is used by the IBM MQ blockchain bridge component of IBM MQ to provide connection capability between IBM MQ queue managers and Hyperledger Fabric. The IBM MQ Blockchain Bridge is shipped as part of IBM MQ on Linux x86-64 only, under the MQSeriesBCBridge RPM package. Based on current knowledge and analysis, no other IBM MQ components or installable packages are affected. This bulletin provides patch information to address the reported both Log4j vulnerabilities (CVE-2021-45046)

Vulnerability Details

CVEID:CVE-2021-45046
**DESCRIPTION:**Apache Log4j is vulnerable to a denial of service, caused by an incomplete fix of CVE-2021-44228 in certain non-default configurations. A remote attacker with control over Thread Context Map (MDC) input data or a Thread Context Map pattern to exploit this vulnerability to craft malicious input data using a JNDI Lookup pattern and cause a denial of service.
CVSS Base score: 3.7
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215195 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

Remediation/Fixes

This issue is resolved by APAR IT39444

The following patches resolve CVE-2021-45046 & CVE-2021-44228.

IBM MQ version 9.2 LTS

Apply iFix 9.2.0.4-IBM-MQ-LinuxX64-LAIT39386-IT39444

IBM MQ version 9.1 CD and 9.2 CD

Apply iFix 9.2.4-IBM-MQ-LinuxX64-LAIT39386-IT39444

Workarounds and Mitigations

The IBM MQ Blockchain Bridge is shipped as part of IBM MQ on Linux x86-64 only, under the MQSeriesBCBridge RPM package. Based on current knowledge and analysis, no other IBM MQ components or installable packages are affected.