CVE-2022-27516: Citrix Gateway and Citrix ADC Security Bulletin for CVE-2022-27510 CVE-2022-27513 and CVE-2022-27516

CTX463706

{{tooltipText}}

Security Bulletin | Critical | {{likeCount}} found this helpful | Created: {{articleFormattedCreatedDate}} | Modified: {{articleFormattedModifiedDate}}

Description of Problem

Vulnerabilities have been discovered in Citrix Gateway and Citrix ADC, listed below. Note that only appliances that are operating as a Gateway (appliances using the SSL VPN functionality or deployed as an ICA proxy with authentication enabled) are affected by the first issue, which is rated as a Critical severity vulnerability.

CVE-ID

Description

CWE

Affected Products

Pre-conditions

CVE-2022-27510

Unauthorized access to Gateway user capabilities

CWE-288: Authentication Bypass Using an Alternate Path or Channel

Citrix Gateway, Citrix ADC

Appliance must be configured as a

• VPN (Gateway)

CVE-2022-27513

Remote desktop takeover via phishing

CWE-345: Insufficient Verification of Data Authenticity

Citrix Gateway, Citrix ADC

Appliance must be configured as a

• VPN (Gateway)

and the RDP proxy functionality must be configured

CVE-2022-27516

User login brute force protection functionality bypass

CWE-693: Protection Mechanism Failure

Citrix Gateway, Citrix ADC

Appliance must be configured as a

• VPN (Gateway)

    OR 

• AAA virtual server

and the user lockout functionality “Max Login Attempts” must be configured

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

• Citrix ADC and Citrix Gateway 13.1 before 13.1-33.47

• Citrix ADC and Citrix Gateway 13.0 before 13.0-88.12

• Citrix ADC and Citrix Gateway 12.1 before 12.1.65.21

• Citrix ADC 12.1-FIPS before 12.1-55.289

• Citrix ADC 12.1-NDcPP before 12.1-55.289

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

Affected customers of Citrix ADC and Citrix Gateway are recommended to install the relevant updated versions of Citrix ADC or Citrix Gateway as soon as possible:

• Citrix ADC and Citrix Gateway 13.1-33.47 and later releases

• Citrix ADC and Citrix Gateway 13.0-88.12 and later releases of 13.0

• Citrix ADC and Citrix Gateway 12.1-65.21 and later releases of 12.1

• Citrix ADC 12.1-FIPS 12.1-55.289 and later releases of 12.1-FIPS

• Citrix ADC 12.1-NDcPP 12.1-55.289 and later releases of 12.1-NDcPP

Please note that Citrix ADC and Citrix Gateway versions prior to 12.1 are EOL and customers on those versions are recommended to upgrade to one of the supported versions.

Additionally, and unrelated to the aforementioned CVEs, security enhancements to help protect customers against HTTP Request Smuggling attacks have been added in the above versions of Citrix ADC, and Citrix Gateway. Customers may enable these enhancements using the Citrix ADC management interface. Please see https://support.citrix.com/article/CTX472830 for more information.

Acknowledgements

Citrix would like to thank Jarosław Kamiński of Securitum 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

2022-11-08

Initial Publication