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AUSCERT External Security Bulletin Redistribution
ESB-2019.3905.2
Authentication Bypass Vulnerability in Citrix ADC and Citrix
Gateway Management Interface
21 October 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix ADC
Citrix Gateway
NetScaler Gateway
Publisher: Citrix
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
Original Bulletin:
https://support.citrix.com/article/CTX261055
Comment: This bulletin contains two (2) Citrix security advisories.
Revision History: October 21 2019: Vendor updated original bulletin (added clarification on RPC node password)
October 18 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Authentication Bypass Vulnerability in Citrix ADC and Citrix Gateway Management Interface
Reference: CTX261055
Category : High
Created : 17 Oct 2019
Modified : 17 Oct 2019
Applicable Products
o Citrix ADC
o Citrix Gateway
o NetScaler Gateway
Description of Problem
A vulnerability has been identified in the management interface of Citrix
Application Delivery Controller (ADC) formerly known as NetScaler ADC and
Citrix Gateway formerly known as NetScaler Gateway that, if exploited, could
allow an attacker with access to the management interface to gain
administrative access to the appliance.
This vulnerability has been assigned the following CVE number:
o CVE-2019-TBD: Authentication Bypass Vulnerability in Citrix ADC and Citrix
Gateway Management Interface
This vulnerability affects the following product versions:
o Citrix ADC and Citrix Gateway version 13.0 earlier than and including build
41.20
o Citrix ADC and NetScaler Gateway version 12.1 earlier than and including
build 54.13
o Citrix ADC and NetScaler Gateway version 12.0 earlier than and including
build 62.8
o Citrix ADC and NetScaler Gateway version 11.1 earlier than and including
build 62.8
o Citrix ADC and NetScaler Gateway version 10.5 earlier than and including
build 70.5
Mitigating Factors
In order to exploit this vulnerability, an attacker would require access to the
management interface of the Citrix ADC. In situations where customers have
deployed their Citrix ADC and Citrix Gateway appliances in line with industry
best practice, network access to this interface should already be restricted.
What Customers Should Do
This vulnerability has been addressed in the following versions of Citrix ADC
and Citrix Gateway:
o Citrix ADC and Citrix Gateway version 13.0 build 41.28 and later
o Citrix ADC and NetScaler Gateway version 12.1 build 54.16 and later
o Citrix ADC and NetScaler Gateway version 12.0 build 62.10 and later
o Citrix ADC and NetScaler Gateway version 11.1 build 63.9 and later
o Citrix ADC and NetScaler Gateway version 10.5 build 70.8 and later
Citrix strongly recommends that customers impacted by this vulnerability
upgrade to a version of the Citrix ADC or Citrix Gateway that contains a fix
for this issue as soon as possible.
These versions are available on the Citrix website at the following addresses:
https://www.citrix.com/downloads/citrix-adc/
https://www.citrix.com/downloads/citrix-gateway/
In line with industry best practice, Citrix also recommends that customers
limit access to the management interface to trusted traffic only. Citrix has
published additional guidance on the secure configuration of the management
interfaces. This can be found at the following location:
https://support.citrix.com/article/CTX228148
Acknowledgements
Citrix thanksMarc-Andre Labonte of Desjardins for working with us to protect
Citrix customers.
Changelog
+------------------+----------------------------------------------------------+
|Date |Change |
+------------------+----------------------------------------------------------+
|17th October 2019 |Initial Publishing |
+------------------+----------------------------------------------------------+
|17th October 2019 |Added Acknowledgement & Clarification on Affected Builds |
+------------------+----------------------------------------------------------+
===============================================================================
Authentication Bypass Vulnerability in the Management Interface of Citrix Application Delivery Controller and Citrix Gateway
Reference: CTX261055
Category : High
Created : 17 Oct 2019
Modified : 18 Oct 2019
Applicable Products
o Citrix ADC
o Citrix Gateway
o NetScaler Gateway
Description of Problem
A vulnerability has been identified in the management interface of Citrix
Application Delivery Controller (ADC) formerly known as NetScaler ADC, and
Citrix Gateway, formerly known as NetScaler Gateway, that, if exploited, could
allow an attacker with access to the management interface to gain
administrative access to the appliance.
This vulnerability has been assigned the following CVE number:
o CVE-2019-TBD:Authentication Bypass Vulnerability in the Management
Interface of Citrix Application Delivery Controller and Citrix Gateway
This vulnerability affects the following product versions:
o Citrix ADC and Citrix Gateway version 13.0 earlier than and including build
41.20
o Citrix ADC and NetScaler Gateway version 12.1 earlier than and including
build 54.13
o Citrix ADC and NetScaler Gateway version 12.0 earlier than and including
build 62.8
o Citrix ADC and NetScaler Gateway version 11.1 earlier than and including
build 62.8
o Citrix ADC and NetScaler Gateway version 10.5 earlier than and including
build 70.5
Mitigating Factors
In order to exploit this vulnerability, an attacker would require access to the
management interface of the Citrix ADC. In situations where customers have
deployed their Citrix ADC and Citrix Gateway appliances in line with industry
best practice, network access to this interface should already be restricted.
If the customer has previously changed the default internal user account or RPC
node password in accordance with the guidelines in the Secure Deployment Guide,
then this issue does not impact their deployment.
What Customers Should Do
This vulnerability has been addressed in the following versions of Citrix ADC
and Citrix Gateway:
o Citrix ADC and Citrix Gateway version 13.0 build 41.28 and later
o Citrix ADC and NetScaler Gateway version 12.1 build 54.16 and later
o Citrix ADC and NetScaler Gateway version 12.0 build 62.10 and later
o Citrix ADC and NetScaler Gateway version 11.1 build 63.9 and later
o Citrix ADC and NetScaler Gateway version 10.5 build 70.8 and later
Citrix strongly recommends that customers impacted by this vulnerability
upgrade to a version of the Citrix ADC or Citrix Gateway that contains a fix
for this issue as soon as possible.
These versions are available on the Citrix website at the following addresses:
https://www.citrix.com/downloads/citrix-adc/
https://www.citrix.com/downloads/citrix-gateway/
Customers may also choose to change the default internal user account or RPC
node password as a workaround for this vulnerability. Please note that this
change may affect existing HA, Cluster, or GSLB configuration on the
deployment. Configuration instructions can be found in the steps included under
"Internal user account or RPC node password" in the section titled "Change the
default passwords" in the following secure deployment guide.
https://docs.citrix.com/en-us/citrix-adc/citrix-adc-secure-deployment/
secure-deployment-guide.html
In line with industry best practice, Citrix also recommends that customers
limit access to the management interface to trusted traffic only. Citrix has
published additional guidance on the secure configuration of the management
interfaces. This can be found at the following location:
https://support.citrix.com/article/CTX228148
Acknowledgements
Citrix thanksMarc-Andre Labonte of Desjardins for working with us to protect
Citrix customers.
Changelog
+------------------+----------------------------------------------------------+
|Date |Change |
+------------------+----------------------------------------------------------+
|17th October 2019 |Initial Publishing |
+------------------+----------------------------------------------------------+
|17th October 2019 |Added Acknowledgement & Clarification on Affected Builds |
+------------------+----------------------------------------------------------+
|18th October 2019 |Added Clarification on RPC node password |
+------------------+----------------------------------------------------------+
- --------------------------END INCLUDED TEXT--------------------
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