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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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