Description of Problem

A security issue has been identified that may allow privileged code running in a guest VM to compromise the host.  This issue is limited to only those guest VMs where the host administrator has explicitly assigned a PCI passthrough device to the guest VM.

The issue has the following identifier:

This issue affects all currently supported versions of Citrix Hypervisor up to and including Citrix Hypervisor 8.2 LTSR.
 

Mitigating Factors

Customers who are not using the PCI passthrough feature of Citrix Hypervisor are not at risk from this issue
 

What Customers Should Do

Citrix has released hotfixes to address this issue. Citrix recommends that affected customers install these hotfixes as their patching schedule allows.  The hotfixes can be downloaded from the following locations:
Citrix Hypervisor 8.2 LTSR: CTX286459 – https://support.citrix.com/article/CTX286459
Citrix Hypervisor 8.1: CTX286458 – https://support.citrix.com/article/CTX286458  
Citrix XenServer 7.1 LTSR CU2: CTX286457 – https://support.citrix.com/article/CTX286457  
Citrix XenServer 7.0: CTX286456 – https://support.citrix.com/article/CTX286456  
 

What Citrix Is Doing

Citrix is notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Center at http://support.citrix.com/.
 

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/open-a-support-case.html.
 

Reporting Security Vulnerabilities

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: – 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.
 

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