Citrix Hypervisor Security Update for CVE-2024-31497

Description of Problem

Versions of XenCenter for Citrix Hypervisor 8.2 CU1 LTSR included a 3rd-party component, PuTTY, that is used to enable SSH connections from XenCenter to guest VMs when the “Open SSH Console” button is selected. The inclusion of PuTTY with XenCenter for Citrix Hypervisor 8.2 CU1 LTSR was deprecated with version 8.2.6 of XenCenter and any versions after 8.2.7 will not include PuTTY.

An issue has been reported in versions of PuTTY prior to version 0.81; when used in conjunction with XenCenter, this issue may, in some scenarios, allow an attacker who controls a guest VM to determine the SSH private key of a XenCenter administrator who uses that key to authenticate to that guest VM while using an SSH connection.

This issue has the following identifier:

• CVE-2024-31497

What Customers Should Do

Customers who do not wish to use the “Open SSH Console” functionality may remove the PuTTY component completely. Customers who wish to maintain the existing usage of PuTTY should replace the version installed on their XenCenter system with an updated version (with a version number of at least 0.81).

Note that versions of XenCenter for XenServer 8 have never included PuTTY.

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&gt;.

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&gt;.

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&gt;.

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&gt;.

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. Cloud Software Group 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