CVE-2023-24491: Citrix Secure Access client for Windows Security Bulletin for CVE-2023-24491

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Security Bulletin | Severity: High | {{likeCount}} found this helpful | Created: {{articleFormattedCreatedDate}} | Modified: {{articleFormattedModifiedDate}} | Status: Final

Description of Problem

A vulnerability has been discovered in the Citrix Secure Access client for Windows.

The following supported versions are affected by the vulnerability:

• Versions before 23.5.1.3

The issue has the following identifier:

CVE ID

Description

Pre-requisites

CWE

CVSS

CVE-2023-24491

Local Privilege escalation to NT AUTHORITY\SYSTEM

Access to an endpoint with Standard User Account that has the vulnerable client installed

Improper Privilege ManagementCWE-269

7.8

What Customers Should Do

This issue has been addressed in the following versions of the Citrix Secure Access client for Windows:

• 23.5.1.3 and later releases

Citrix recommends that customers who are affected by the above vulnerability upgrade the Citrix Secure Access client for Windows installed on their endpoints by taking the following actions as soon as possible:

1. If Citrix Secure Access client for Windows is distributed via the SSL VPN upgrade control feature of Citrix ADC or Citrix Gateway:

Check the versions of the Citrix Secure Access client for Windows that are being distributed by each Citrix ADC or Citrix Gateway instance. This can be done using either GUI (instructions at: https://www.citrix.com/downloads/citrix-gateway/plug-ins/citrix-secure-access-client-for-windows.html) or by viewing the file located at /var/netscaler/gui/vpn/pluginlist.xml. If it is a vulnerable version, customers must:

• Replace the vulnerable client on the Citrix ADC or Citrix Gateway by following the instructions at: https://www.citrix.com/downloads/citrix-gateway/plug-ins/citrix-secure-access-client-for-windows.html.

Information about the upgrade control feature is detailed at: https://docs.citrix.com/en-us/citrix-gateway/13/vpn-user-config/how-users-connect-with-gateway-plugin.html#control-upgrade-of-citrix-gateway-plug-ins

2. If the Citrix Secure Access client is distributed/upgraded directly onto users’ devices:

Customers must install the above-mentioned fixed client on their users’ devices by downloading them from https://www.citrix.com/downloads/citrix-gateway/plug-ins/citrix-secure-access-client-for-windows.html

Acknowledgements

Citrix thanks Rilke Petrosky of F2TC Cyber Security 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

2023-07-11 T 14:30:00Z

Initial Publication