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AUSCERT External Security Bulletin Redistribution
ESB-2021.3830
Citrix Application Delivery Controller, Citrix Gateway, and Citrix SD-WAN
WANOP Edition appliance Security Update
10 November 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix ADC
Citrix Gateway
Citrix SD-WAN WANOP
Publisher: Citrix
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-22956 CVE-2021-22955
Original Bulletin:
https://support.citrix.com/article/CTX330728
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Citrix Application Delivery Controller, Citrix Gateway, and Citrix SD-WAN WANOP Edition appliance Security Update
Reference: CTX330728
Category : Critical
Created : 09 November 2021
Modified : 09 November 2021
Applicable Products
o Citrix ADC
o Citrix Gateway
o Citrix SD-WAN WANOP
Description of Problem
Vulnerabilities have been discovered in Citrix ADC (formerly known as NetScaler
ADC), Citrix Gateway (formerly known as NetScaler Gateway), and Citrix SD-WAN
WANOP Edition models 4000-WO, 4100-WO, 5000-WO, and 5100-WO. These
vulnerabilities, if exploited, could result in the following security issues:
+--------------+---------------+------------+--------+--------------+-----------+
|CVE-ID |Description |CWE |Affected|Pre-conditions|Criticality|
| | | |Products| | |
+--------------+---------------+------------+--------+--------------+-----------+
| | | | |Appliance must| |
| |Unauthenticated|CWE-400: |Citrix |be configured | |
|CVE-2021-22955|denial of |Uncontrolled|ADC, |as a VPN |Critical |
| |service |Resource |Citrix |(Gateway) or | |
| | |Consumption |Gateway |AAA virtual | |
| | | | |server | |
+--------------+---------------+------------+--------+--------------+-----------+
| | | |Citrix | | |
| |Temporary | |ADC, |Access to NSIP| |
| |disruption of |CWE-400: |Citrix |or SNIP with | |
|CVE-2021-22956|the Management |Uncontrolled|Gateway,|management |Low |
| |GUI, Nitro API |Resource |Citrix |interface | |
| |and RPC |Consumption |SD-WAN |access | |
| |communication | |WANOP | | |
| | | |Edition | | |
+--------------+---------------+------------+--------+--------------+-----------+
The following supported versions of Citrix ADC and Citrix Gateway are affected
by CVE-2021-22955 and CVE-2021-22956:
o Citrix ADC and Citrix Gateway 13.0 before 13.0-83.27
o Citrix ADC and Citrix Gateway 12.1 before 12.1-63.22
o Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.23
o Citrix ADC 12.1-FIPS before 12.1-55.257
The following supported versions of Citrix SD-WAN WANOP Edition are affected by
CVE-2021-22956:
o Citrix SD-WAN WANOP Edition 11.4 before 11.4.2
o Citrix SD-WAN WANOP Edition 10.2 before 10.2.9c
Please note that the WANOP feature of SD-WAN Premium Edition is not impacted.
This bulletin only applies to customer-managed Citrix ADC, Citrix Gateway and
Citrix SD-WAN WANOP Edition appliances. Customers using Citrix-managed cloud
services do not need to take any action.
What Customers Should Do
The following supported versions of Citrix ADC and Citrix Gateway address both
CVE-2021-22955 and CVE-2021-22956:
o Citrix ADC and Citrix Gateway 13.1-4.43 and later releases of 13.1
o Citrix ADC and Citrix Gateway 13.0-83.27 and later releases of 13.0
o Citrix ADC and Citrix Gateway 12.1-63.22 and later releases of 12.1
o Citrix ADC and NetScaler Gateway 11.1-65.23 and later releases of 11.1
o Citrix ADC 12.1-FIPS 12.1-55.257 and later releases of 12.1-FIPS
The following supported versions of Citrix SD-WAN WANOP Edition address
CVE-2021-22956:
o Citrix SD-WAN WANOP Edition 11.4.2 and later releases of 11.4
o Citrix SD-WAN WANOP Edition 10.2.9c and later releases of 10.2
Citrix recommends that affected customers install the relevant update as soon
as possible.
In addition, upon upgrading to a fixed version, customers must modify the
device configuration to resolve CVE-2021-22956. See Citrix Application Delivery
Controller, Citrix Gateway, and Citrix SD-WAN WANOP Edition - Management Module
Configuration Reference Guide for details.
What Citrix is Doing
Citrix is notifying customers and channel partners about this potential
security issue. This article is also available from the Citrix Knowledge Center
at https://support.citrix.com/ .
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/ .
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.
Changelog
Date Change
2021-11-09 Initial Publication
2021-11-09 Minor formatting changes
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