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AUSCERT External Security Bulletin Redistribution
ESB-2021.2434
Citrix Application Delivery Controller, Citrix Gateway, and Citrix SD-WAN
WANOP Edition appliance Security Update
20 July 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
Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-22927 CVE-2021-22920 CVE-2021-22919
Original Bulletin:
https://support.citrix.com/article/CTX319135
- --------------------------BEGIN INCLUDED TEXT--------------------
Citrix Application Delivery Controller, Citrix Gateway, and Citrix SD-WAN WANOP Edition appliance Security Update
Reference: CTX319135
Category : High
Created : 19 July 2021
Modified : 19 July 2021
Applicable Products
o Citrix ADC
o Citrix Gateway
o Citrix SD-WAN WANOP
Description of Problem
Multiple vulnerabilities have been discovered in Citrix ADC (formerly known as
NetScaler ADC) and 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 |
| | | |Products | |
+--------------+-------------------+------------+-------------+---------------+
| | |CWE-400: |Citrix ADC, |Unauthenticated|
| |Limited disk space |Uncontrolled|Citrix |attacker must |
|CVE-2021-22919|consumption on the |Resource |Gateway, |be able to |
| |appliance |Consumption |Citrix SD-WAN|reach the |
| | | |WANOP Edition|management GUI |
+--------------+-------------------+------------+-------------+---------------+
| |SAML authentication|CWE-284: | |Citrix ADC or |
| |hijack through a |Improper |Citrix ADC, |Citrix Gateway |
|CVE-2021-22920|phishing attack to |access |Citrix |must be |
| |steal a valid user |control |Gateway |configured as a|
| |session | | |SAML SP |
+--------------+-------------------+------------+-------------+---------------+
| | | | |Citrix ADC or |
| |Session fixation by|CWE-384: |Citrix ADC, |Citrix Gateway |
|CVE-2021-22927|an authorized user |Session |Citrix |must be |
| |on SAML SP |Fixation |Gateway |configured as a|
| | | | |SAML SP |
+--------------+-------------------+------------+-------------+---------------+
The following supported versions of Citrix ADC, Citrix Gateway, and Citrix
SD-WAN WANOP Edition are affected by CVE-2021-22919:
o Citrix ADC and Citrix Gateway 13.0 before 13.0-82.45
o Citrix ADC and Citrix Gateway 12.1 before 12.1-62.27
o Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.22
o Citrix ADC 12.1-FIPS before 12.1-55.247
o Citrix SD-WAN WANOP Edition 11.4 before 11.4.0.a
o Citrix SD-WAN WANOP Edition 11.3 before 11.3.2.a
o Citrix SD-WAN WANOP Edition 11.2 before 11.2.3.b
o Citrix SD-WAN WANOP Edition 10.2 before 10.2.9.b
The following supported versions of Citrix ADC and Citrix Gateway are affected
by CVE-2021-22920:
o Citrix ADC and Citrix Gateway 13.0-82.42
o Citrix ADC and Citrix Gateway 12.1-62.25
The following supported versions of Citrix ADC and Citrix Gateway are affected
by CVE-2021-22927:
o Citrix ADC and Citrix Gateway 13.0 before 13.0-82.45
o Citrix ADC and Citrix Gateway 12.1 before 12.1-62.27
o Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.22
o Citrix ADC 12.1-FIPS before 12.1-55.247
These issues have already been addressed in Citrix managed Cloud services such
as Citrix Gateway Service and Citrix Secure Workspace Access. Customers using
Citrix managed Cloud services do not need to take any action.
What Customers Should Do
The following supported versions of Citrix ADC, Citrix Gateway and Citrix
SD-WAN WANOP Edition address CVE-2021-22919:
o Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0
o Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1
o Citrix ADC and NetScaler Gateway 11.1-65.22 and later releases of 11.1
o Citrix ADC 12.1-FIPS 12.1-55.247 and later releases of 12.1-FIPS
o Citrix SD-WAN WANOP Edition 11.4.0a and later releases of 11.4
o Citrix SD-WAN WANOP Edition 11.3.2a and later releases of 11.3
o Citrix SD-WAN WANOP Edition 11.2.3b and later releases of 11.2
o Citrix SD-WAN WANOP Edition 10.2.9b and later releases of 10.2
The following supported versions of Citrix ADC and Citrix Gateway address
CVE-2021-22920
o Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0
o Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1
The following supported versions of Citrix ADC and Citrix Gateway address
CVE-2021-22927
o Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0
o Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1
o Citrix ADC and NetScaler Gateway 11.1-65.22 and later releases of 11.1
o Citrix ADC 12.1-FIPS 12.1-55.247 and later releases of 12.1-FIPS
Citrix strongly recommends that affected customers install relevant updates as
soon as possible.
If Citrix ADC or Citrix Gateway is configured as a SAML SP, customers must
ensure that the device is configured accordingly. See Citrix Application
Delivery Controller and Gateway - SAML Configuration Reference Guide for
details. Customers who have previously set the SAML configuration according to
the document do not need to reapply the configuration changes.
Acknowledgements
Citrix would like to thank Wolfgang Ettlinger and Marc Nimmerrichter of
Certitude Consulting for working with us to protect Citrix customers.
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
2021-07-19 Initial Publication
2021-07-19 CVE-2021-22919 clarification
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