Security Bulletin: IBM MQ is affected by vulnerabilities in libcURL (CVE-2023-23916, CVE-2023-27535)

Summary

Multiple issues were identified within the libcurl library that affect IBM MQ. IBM MQ uses libcurl to provide HTTPURL functionality which is only used to download remote CCDT files and is not used to send or receive messages.

Vulnerability Details

CVEID:CVE-2023-23916
**DESCRIPTION:**cURL libcurl is vulnerable to a denial of service, caused by a flaw in the decompression chain implementation. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause memory errors, and results in a denial of service condition.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/247437 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-2023-27535
**DESCRIPTION:**cURL libcurl could allow a remote attacker to bypass security restrictions, caused by a FTP too eager connection reuse flaw. By sending a specially crafted request, an attacker could exploit this vulnerability to reuse a previously created FTP connection.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/250530 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)

Affected Products and Versions

The following installable MQ components are affected by the vulnerability:

- Standard Client
- Runtime

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 IT43273

IBM MQ 9.0 LTS

Apply cumulative security update 9.0.0.17

IBM MQ 9.1 LTS

Apply FixPack 9.1.0.15

IBM MQ 9.2 LTS

Apply cumulative security update 9.2.0.11

IBM MQ 9.3 LTS

Apply FixPack 9.3.0.5

IBM MQ 9.1 CD, 9.2 CD and 9.3 CD

Upgrade to IBM MQ 9.3.2 and apply cumulative security update 9.3.2.1

Workarounds and Mitigations

None