Security Bulletin: IBM MQ is affected by a vulnerability in libcURL

Summary

An issue was identified within the libcurl library that affects IBM MQ. IBM MQ uses libcurl to provide HTTPURL functionality. This is only used to download remote CCDT files and is not used to send or receive messages.

Vulnerability Details

CVEID:CVE-2023-38039
**DESCRIPTION:**cURL libcurl is vulnerable to a denial of service, caused by not limiting the number and size of headers accept in a response. By sending a specially crafted request, a remote attacker could exploit this vulnerability to run out of heap memory, and results in a denial of service condition.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/265946 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 IBM MQ components are affected by the vulnerability:

- Runtime
- Standard Client

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 IT44585

IBM MQ 9.0 LTS

Apply Cumulative Security Update 9.0.0.21

IBM MQ 9.1 LTS

Apply Cumulative Security Update 9.1.0.18

IBM MQ 9.2 LTS

Apply Fix Pack 9.2.0.20

IBM MQ 9.3 LTS

Apply Cumulative Security Update 9.3.0.11

IBM MQ version 9.3 CD

Upgrade to IBM MQ version 9.3.4

Workarounds and Mitigations

None