-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
Citrix Hypervisor Security Update
5 February 2021
AusCERT Security Bulletin Summary
Product: Citrix Hypervisor
Operating System: Virtualisation
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2021-3308
- --------------------------BEGIN INCLUDED TEXT--------------------
Citrix Hypervisor Security Update
Category : Low
Created : 02 February 2021
Modified : 04 February 2021
o Citrix Hypervisor
Description of Problem
A security issue has been identified that may allow privileged code running in
a guest VM to which a PCI passthrough device has been allocated to cause other
VMs with PCI passthrough devices to fail to boot, crash or become unresponsive.
This only applies to guest VMs where the host administrator has explicitly
allocated a host PCI device to the guest VM ("PCI Passthrough").
This issue has the following CVE identifier:
CVE ID Description Vulnerability Pre-conditions
An attacker with the ability to
execute privileged code in a CWE-664: Administrator
guest VM to which a PCI Improper access in guest
CVE-2021-3308 passthrough device has been Control of a to which a PCI
allocated can cause other VMs Resource passthrough
with PCI passthrough devices to Through its device has been
fail to boot, crash or become Lifetime allocated
The only supported version of Citrix Hypervisor affected by this issue is 8.2
What Customers Should Do
Citrix has released a hotfix to address this issue. Citrix recommends that
affected customers install this hotfix as their patching schedule allows. The
hotfix can be downloaded from the following location:
Citrix Hypervisor 8.2 LTSR: CTX292625 - https://support.citrix.com/article/
Citrix is notifying customers and channel partners about this potential
security issue. This article is also available from the Citrix Knowledge Center
at . If you require technical assistance with this issue, please contact Citrix
Technical Support. Contact details for Citrix Technical Support are available
at . Citrix welcomes input regarding the security of its products and considers
any and all potential vulnerabilities seriously. For details on our
vulnerability response process and guidance on how to report security-related
issues to Citrix, please see the following webpage: - 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.
2021-02-04 Initial Publication
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to firstname.lastname@example.org
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: email@example.com
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----