CVE-2023-24483: Citrix Virtual Apps and Desktops Security Bulletin for CVE-2023-24483

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Description of Problem

A vulnerability has been identified that, if exploited, could result in a local user elevating their privilege level to NT AUTHORITY\SYSTEM on a Citrix Virtual Apps and Desktops Windows VDA.

The vulnerability has been given the following identifier:

CVE ID

Description

Vulnerability Type

Pre-conditions

CVE-2023-24483

Privilege Escalation to NT AUTHORITY\SYSTEM on the vulnerable VDA

CWE-269: Improper Privilege Management

Local access to a Windows VDA as a standard Windows user

The vulnerability affects the following supported versions of Citrix Virtual Apps and Desktops:

Current Release (CR)

• Citrix Virtual Apps and Desktops versions before 2212

Long Term Service Release (LTSR)

• Citrix Virtual Apps and Desktops 2203 LTSR before CU2
• Citrix Virtual Apps and Desktops 1912 LTSR before CU6

In addition, customers using Citrix Virtual Apps and Desktops Service using any of the vulnerable versions of Citrix Virtual Apps and Desktops Windows VDA are affected and need to take action.

What Customers Should Do

Recent versions of Citrix Virtual Apps and Desktops contain fixes for this vulnerability:

• Citrix Virtual Apps and Desktops 2212 and later versions
• Citrix Virtual Apps and Desktops 2203 LTSR CU2 and later cumulative updates
• Citrix Virtual Apps and Desktops 1912 LTSR CU6 and later cumulative updates

Citrix strongly recommends that customers upgrade to a version of Virtual Apps and Desktops that contains the fixes as soon as possible.

The latest versions of Citrix Virtual Apps and Desktops are available from the following Citrix website location:

https://www.citrix.com/downloads/citrix-virtual-apps-and-desktops/

Acknowledgements

Citrix would like to thank the Lockheed Martin Red Team for working with us to protect Citrix customers.

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

2023-02-14

Initial publication