Security Bulletin: IBM MQ is vulnerable to an issue in IBM GSKit (CVE-2023-32342)

Summary

Vulnerabilities in GSKit affect IBM MQ. IBM MQ has addressed the applicable CVEs.

Vulnerability Details

CVEID:CVE-2023-32342
**DESCRIPTION:**IBM GSKit could allow a remote attacker to obtain sensitive information, caused by a timing-based side channel in the RSA Decryption implementation. By sending an overly large number of trial messages for decryption, an attacker could exploit this vulnerability to obtain sensitive information. IBM X-Force ID: 255828.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/255828 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:

- IBM Global Security Kit (GSKit)

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 IT43802

IBM MQ 9.0 LTS

Apply cumulative security update 9.0.0.18

IBM MQ 9.1 LTS

Apply cumulative security update 9.1.0.16

IBM MQ 9.2 LTS

Apply fix pack 9.2.0.15

IBM MQ 9.3 LTS

Apply cumulative security update 9.3.0.6

IBM MQ 9.2 CD and 9.3 CD

Upgrade to IBM MQ Version 9.3.3

Workarounds and Mitigations

All versions of MQ can mitigate the vulnerability by avoiding the use of affected CipherSpecs. The vulnerable CipherSpecs are those whose name begins TLS_RSA_*.

See Enabling CipherSpecs for a list of currently supported CipherSpecs.