Security Bulletin: IBM MQ Blockchain bridge dependencies are vulnerable to issues in Apache Log4j (CVE-2021-45105 & CVE-2021-44832)

Security Bulletin

Summary

A Denial of Service issue was identified within the Log4j fix for CVE-2021-45046 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 Log4j vulnerabilities

Vulnerability Details

CVEID: CVE-2021-45105
DESCRIPTION: Apache Log4j is vulnerable to a denial of service, caused by the failure to protect from uncontrolled recursion from self-referential lookups. A remote attacker with control over Thread Context Map (MDC) input data could craft malicious input data that contains a recursive lookup to cause a StackOverflowError that will terminate the process. Note: The vulnerability is also called LOG4J2-3230.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215647 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)

CVEID: CVE-2021-44832
DESCRIPTION: Apache Log4j could allow a remote attacker with permission to modify the logging configuration file to execute arbitrary code on the system. By constructing a malicious configuration using a JDBC Appender with a data source referencing a JNDI URI , an attacker could exploit this vulnerability to execute remote code.
CVSS Base score: 6.6
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/216189 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s)	Version(s)
IBM MQ	9.2 CD
IBM MQ	9.1 CD
IBM MQ	9.2 LTS

Remediation/Fixes

This issue is resolved by APAR IT39467

The following patches resolve CVE-2021-45046, CVE-2021-44228, CVE-2021-45105 & CVE-2021-44832

IBM MQ version 9.2 LTS

Apply iFix 9.2.0.4-IBM-MQ-LinuxX64-LAIT39386-IT39444-IT39467

IBM MQ version 9.1 CD and 9.2 CD

Apply iFix 9.2.4-IBM-MQ-LinuxX64-LAIT39386-IT39444-IT39467

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.

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References

Complete CVSS v3 Guide
On-line Calculator v3

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Change History

07 Jan 2022: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location

Worldwide

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Tips

Security Bulletin: IBM MQ Blockchain bridge dependencies are vulnerable to issues in Apache Log4j (CVE-2021-45105 & CVE-2021-44832)