Description of Problem

Two issues have been identified, the first of which affects both XenServer 8 and Citrix Hypervisor 8.2 CU1 LTSR and the second of which affects Citrix Hypervisor 8.2 CU1 LTSR only.

The first issue, which affects both XenServer 8 and Citrix Hypervisor 8.2 CU1 LTSR, may allow a malicious administrator of a guest VM to cause the host to crash or become unresponsive.  This issue can only be exploited by VMs where the host administrator has specifically enabled the passthrough of a PCI device and where that passed-through PCI device supports the use of multiple consecutive interrupt vectors (sometimes known as “Multiple Message MSI”).

This issue has the following identifier:

• CVE-2024-31143

The second issue, which affects Citrix Hypervisor 8.2 CU1 LTSR only, may allow an attacker who can create appropriate files in specific locations on a guest’s virtual disks to access data stored on the disks of other VMs.  This attack can only take effect at the point where a host administrator uses the “Restore Virtual Machine Metadata” option from the xsconsole panel within a host’s control domain (Dom0).  The issue cannot be triggered from the “Backup Virtual Machine Metadata” option.  Customers who are not using this metadata restore functionality are not affected by this issue.

This issue has the following identifier:

• CVE-2024-31144

What Customers Should Do

For customers using XenServer 8, we have pushed an update to both the Early Access and Normal update channels.  We recommend that customers update to the latest version from their chosen channel following the instructions at https://docs.xenserver.com/en-us/xenserver/8/update

For customers using Citrix Hypervisor 8.2 CU1 LTSR, we have released hotfixes to address these issues. We recommend that customers install these hotfixes and follow the instructions in the linked article.  The hotfixes can be downloaded from the following location:

CTX677991- https://support.citrix.com/s/article/CTX677991-hotfix-xs82ecu1066-for-citrix-hypervisor-82-cumulative-update-1

CTX691101- https://support.citrix.com/s/article/CTX691101-hotfix-xs82ecu1070-for-citrix-hypervisor-82-cumulative-update-1

What We Are Doing 

We are 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.

Subscribe to Receive Alerts 

We strongly recommend that all customers subscribe to receive alerts when a security bulletin is created or modified at https://support.citrix.com/user/alerts.

Reporting Security Vulnerabilities to us 

We welcome input regarding the security of our products and consider any and all potential vulnerabilities seriously. For details on our vulnerability response process and guidance on how to report security-related issues to us, please see the following webpage: https://www.citrix.com/about/trust-center/vulnerability-process.html.

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