ESB-2017.2443 - [Appliance] Citrix NetScaler ADC and Citrix NetScaler Gateway: Administrator compromise - Remote/unauthenticated 2017-09-27

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2443
        Authentication Bypass Vulnerability in Citrix NetScaler ADC
                and NetScaler Gateway Management Interface
                             27 September 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Citrix NetScaler ADC
                   Citrix NetScaler Gateway
Publisher:         Citrix
Operating System:  Network Appliance
Impact/Access:     Administrator Compromise -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-14602  

Original Bulletin: 
   https://support.citrix.com/article/CTX227928

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CTX227928

Authentication Bypass Vulnerability in Citrix NetScaler ADC and NetScaler 
Gateway Management Interface

Security Bulletin

High

Created: 25 Sep 2017

Modified: 26 Sep 2017


Applicable Products

NetScaler 11.0

NetScaler 11.1

NetScaler 12.0

NetScaler Gateway 11.0

NetScaler Gateway 11.1

NetScaler Gateway 12.0

NetScaler 10.5

NetScaler 10.1

NetScaler Gateway 10.5

NetScaler Gateway 10.1


Description of Problem

A vulnerability has been identified in the management interface of Citrix 
NetScaler Application Delivery Controller (ADC) and NetScaler Gateway that, if
exploited, could allow an attacker with access to the NetScaler management 
interface to gain administrative access to the appliance.

This vulnerability has been assigned the following CVE number:

CVE-2017-14602: Authentication Bypass Vulnerability in Citrix NetScaler ADC 
and NetScaler Gateway Management Interface

This vulnerability affects the following product versions:

Citrix NetScaler ADC and NetScaler Gateway version 12.0 earlier than build 
53.13 (except for build 41.24)

Citrix NetScaler ADC and NetScaler Gateway version 11.1 earlier than build 
55.13

Citrix NetScaler ADC and NetScaler Gateway version 11.0 earlier than build 
70.16

Citrix NetScaler ADC and NetScaler Gateway version 10.5 earlier than build 
66.9

Citrix NetScaler ADC and NetScaler Gateway version 10.5e earlier than build 
60.7010.e

Citrix NetScaler ADC and NetScaler Gateway version 10.1 earlier than build 
135.18

Mitigating Factors

In order to exploit this vulnerability, an attacker would require access to 
the management interface of the NetScaler. In situations where customers have
deployed their NetScaler ADC and NetScaler 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 
NetScaler ADC and NetScaler Gateway:

Citrix NetScaler ADC and NetScaler Gateway version 12.0 build 41.24 and build
53.13 and later

Citrix NetScaler ADC and NetScaler Gateway version 11.1 build 55.13 and later

Citrix NetScaler ADC and NetScaler Gateway version 11.0 build 70.16 and later

Citrix NetScaler ADC and NetScaler Gateway version 10.5 build 66.9 and later

Citrix NetScaler ADC and NetScaler Gateway version 10.5e build 60.7010.e and 
later

Citrix NetScaler ADC and NetScaler Gateway version 10.1 build 135.18 and later

Citrix strongly recommends that customers impacted by this vulnerability 
upgrade to a version of the Citrix NetScaler ADC or NetScaler 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/netscaler-adc/

https://www.citrix.com/downloads/netscaler-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 NetScaler 
management interfaces. This can be found at the following location:

https://support.citrix.com/article/CTX228148

Acknowledgements

Citrix thanks Frank Gifford of NCC Group (https://nccgroup.trust) 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 http://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.html.

Reporting Security Vulnerabilities

Citrix welcomes input regarding the security of its products and considers any
and all potential vulnerabilities seriously. For guidance on how to report 
security-related issues to Citrix, please see the following document: 
CTX081743 - Reporting Security Issues to Citrix

Changelog

Date			Change

25th September 2017	Initial publishing

26th September 2017	Update to What Customers Should Do section

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