Description of Problem
AMD has disclosed an issue that affects AMD CPU hardware and may allow code inside a guest VM to infer the contents of RAM memory elsewhere on the host. Although this is not an issue in the Citrix Hypervisor product itself, Citrix is releasing hotfixes that include product changes to mitigate this CPU hardware issue.
This issue has the following two CVE identifiers:
This issue has the following two CVE identifiers:
- CVE-2022-23825
- CVE-2022-29900
Mitigating Factors
This issue affects systems running Citrix Hypervisor when running on AMD Zen 1 or AMD Zen 2 CPUs; it does not affect Citrix Hypervisor when running on AMD Zen 3 CPUs or on Intel CPUs if those systems have all previous security updates applied.
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 CU1 LTSR: CTX461352 – https://support.citrix.com/article/CTX461352
Citrix XenServer 7.1 CU2 LTSR: CTX461353 – https://support.citrix.com/article/CTX461353
Note that remediating this hardware issue in software may impact performance on affected CPUs.
Citrix Hypervisor 8.2 CU1 LTSR: CTX461352 – https://support.citrix.com/article/CTX461352
Citrix XenServer 7.1 CU2 LTSR: CTX461353 – https://support.citrix.com/article/CTX461353
Note that remediating this hardware issue in software may impact performance on affected CPUs.
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 |
| 2022-07-12 | Initial Publication |
| 2022-07-13 | Updated CVE ID |
| 2022-07-13 | Change title of article to reflect updated CVEs |