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                               CERT-Renater

                     Note d'Information No. 2024/VULN115
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DATE                : 13/03/2024

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Citrix Hypervisor.

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https://support.citrix.com/article/CTX616982/citrix-hypervisor-security-update-for-cve202339368-and-cve202338575
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Citrix Hypervisor Security Update for CVE-2023-39368 and CVE-2023-38575

Reference: CTX616982
Category : Severity: Medium
Created  : 12 March 2024
Modified : 12 March 2024


Description of Problem

Intel has disclosed several security issues affecting certain Intel
CPUs.
Although these are not vulnerabilities in the Citrix Hypervisor product
itself, for the convenience of our customers we are providing a hotfix
that includes updated Intel microcode to mitigate these CPU hardware
issues.
These issues include the following identifiers:

   o CVE-2023-39368
   o CVE-2023-38575

In addition, Intel has disclosed an issue (CVE-2023-28746) that affects
certain Intel CPUs, none of which are on the Citrix Hypervisor Hardware
Compatibility List. However, it was not currently possible for guest VMs to
determine if they were running on hardware that was vulnerable to this 
issue;
the provided hotfix allows guest VMs that are running on unaffected CPUs to
determine this, avoiding the possibility that they would display erroneous
warning notifications.


What Customers Should Do

We have released a hotfix to address these issues. We recommend that
customers install this hotfix and follow the instructions in the linked
article as their update schedule permits. The hotfix can be downloaded
from the following location:

CTX586659 - https://support.citrix.com/article/CTX586659


What We Are Doing

We are notifying customers and channel partners about this potential
security issue through the publication of this security bulletin on the
Citrix Knowledge Center at https://support.citrix.com/securitybulletins .


Obtaining Support on This Issue

If you require technical assistance with this issue, please contact Citrix
Technical Support. Contact details for Citrix Technical Support are
available at https://www.citrix.com/support .


Subscribe to Receive Alerts

We strongly recommend that all customers subscribe to receive alerts when
a security bulletin is created or modified at
https://support.citrix.com/user/ alerts .


Reporting Security Vulnerabilities to Us

We welcome input regarding the security of our products and consider
any and all potential vulnerabilities seriously. For details on our
vulnerability response process and guidance on how to report
security-related issues to us, please see the following webpage:
https://www.citrix.com/about/trust-center/ vulnerability-process.html .


Disclaimer

This document is provided on an "as is" basis and does not imply any kind
of guarantee or warranty, including the warranties of merchantability or
fitness for a particular use. Your use of the information on the document
is at your own risk. Citrix reserves the right to change or update this
document at any time. Customers are therefore recommended to always view
the latest version of this document directly from the Citrix Knowledge
Center.


Changelog

2024-03-12 Initial Publication

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+ CERT-RENATER        |    tel : 01-53-94-20-44         +
+ 23/25 Rue Daviel    |    fax : 01-53-94-20-41         +
+ 75013 Paris         |   email:cert@support.renater.fr +
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