CVE-2022-27509: Citrix ADC and Citrix Gateway Security Bulletin for CVE-2022-27509

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Description of Problem

A vulnerability has been discovered in Citrix ADC and Citrix Gateway which enables an attacker to create a specially crafted URL that redirects to a malicious website.

This vulnerability has the following identifier:

CVE-ID

Description

CWE

Pre-conditions

CVE-2022-27509

Unauthenticated redirection to a malicious website

CWE-345: Insufficient Verification of Data Authenticity

Appliance must be configured as a VPN (Gateway) or AAA virtual server

A victim user must use an attacker-crafted link

The following supported versions of Citrix ADC and Citrix Gateway are affected by this vulnerability:

• Citrix ADC and Citrix Gateway 13.1 before 13.1-24.38

• Citrix ADC and Citrix Gateway 13.0 before 13.0-86.17

• Citrix ADC and Citrix Gateway 12.1 before 12.1-65.15

• Citrix ADC 12.1-FIPS before 12.1-55.282

• Citrix ADC 12.1-NDcPP before 12.1-55.282

This bulletin only applies to customer-managed Citrix ADC and Citrix Gateway appliances. Customers using Citrix-managed cloud services do not need to take any action.

What Customers Should Do

Citrix recommends that affected customers install the relevant updated versions of Citrix ADC or Citrix Gateway as soon as possible:

• Citrix ADC and Citrix Gateway 13.1-24.38 and later releases

• Citrix ADC and Citrix Gateway 13.0-86.17 and later releases of 13.0

• Citrix ADC and Citrix Gateway 12.1-65.15 and later releases of 12.1

• Citrix ADC 12.1-FIPS 12.1-55.282 and later releases of 12.1-FIPS

• Citrix ADC 12.1-NDcPP 12.1-55.282 and later releases of 12.1-NDcPP

Note: Customers who have previously copied the httpd.conf file to the /nsconfig directory must follow the steps at URL to ensure this security update is correctly installed.

Acknowledgements

Citrix would like to thank James Kettle of PortSwigger 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

2022-07-26

Initial Publication