Description of Problem
Several security issues have been identified that affect Citrix Hypervisor:
An issue has been identified that may allow privileged code in a PV guest VM to cause the host to crash. This issue has the following identifier:
An issue has been identified that may allow privileged code in a guest VM to cause the host to crash. This issue only affects systems where the malicious guest VM has had a physical PCI device assigned through to it by the host administrator using the PCI passthrough feature. This issue has the following identifier:
Intel has disclosed an issue that affects Intel CPU hardware together with corresponding microcode updates. Although this is not an issue in the Citrix Hypervisor product itself, Citrix is releasing hotfixes that include the updated microcode together with the product changes needed to support the new microcode. This issue has the following identifier:
An issue has been identified that may allow privileged code in a PV guest VM to cause the host to crash. This issue has the following identifier:
- CVE-2022-23034
An issue has been identified that may allow privileged code in a guest VM to cause the host to crash. This issue only affects systems where the malicious guest VM has had a physical PCI device assigned through to it by the host administrator using the PCI passthrough feature. This issue has the following identifier:
- CVE-2022-23035
Intel has disclosed an issue that affects Intel CPU hardware together with corresponding microcode updates. Although this is not an issue in the Citrix Hypervisor product itself, Citrix is releasing hotfixes that include the updated microcode together with the product changes needed to support the new microcode. This issue has the following identifier:
- CVE-2021-0145
What Customers Should Do
Citrix has released hotfixes to address these issues. 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 CU1 LTSR: CTX338451 – https://support.citrix.com/article/CTX338451
Citrix Hypervisor 8.2: CTX338452 – https://support.citrix.com/article/CTX338452
Citrix XenServer 7.1 CU2 LTSR: CTX338453 – https://support.citrix.com/article/CTX338453
Citrix Hypervisor 8.2 CU1 LTSR: CTX338451 – https://support.citrix.com/article/CTX338451
Citrix Hypervisor 8.2: CTX338452 – https://support.citrix.com/article/CTX338452
Citrix XenServer 7.1 CU2 LTSR: CTX338453 – https://support.citrix.com/article/CTX338453
What Citrix is Doing
Citrix is 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/open-a-support-case.
Subscribe to Receive Alerts
Citrix strongly recommends that all customers subscribe to receive alerts when a Citrix security bulletin is created or modified at https://support.citrix.com/user/alerts.
Reporting Security Vulnerabilities to Citrix
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. Customers are therefore recommended to always view the latest version of this document directly from the Citrix Knowledge Center.
Changelog
| Date | Change |
| 2022-02-08 | Initial Publication |