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AUSCERT External Security Bulletin Redistribution
ESB-2021.0404
Citrix Hypervisor Security Update
5 February 2021
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AusCERT Security Bulletin Summary
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Product: Citrix Hypervisor
Publisher: Citrix
Operating System: Virtualisation
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3308
Original Bulletin:
https://support.citrix.com/article/CTX291439
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Citrix Hypervisor Security Update
Reference: CTX291439
Category : Low
Created : 02 February 2021
Modified : 04 February 2021
Applicable Products
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
Type
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
unresponsive.
The only supported version of Citrix Hypervisor affected by this issue is 8.2
LTSR.
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/
CTX292625
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.
Changelog
Date Change
2021-02-04 Initial Publication
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