==================================================================== CERT-Renater Note d'Information No. 2021/VULN365 _____________________________________________________________________ DATE : 20/07/2021 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Citrix ADC, Citrix Gateway versions prior to 13.0-82.45, 12.1-62.27, Citrix ADC, NetScaler Gateway versions prior to 11.1-65.22, Citrix ADC 12.1-FIPS versions prior to 12.1-55.247, Citrix SD-WAN WANOP versions prior to 11.4.0.a, 11.3.2.a, 11.2.3.b, 10.2.9.b. ===================================================================== https://support.citrix.com/article/CTX319135 _____________________________________________________________________ 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, | Unauth enticated| | |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 ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 23/25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email:cert@support.renater.fr + =========================================================