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             AUSCERT External Security Bulletin Redistribution

    CTX239002 - Cross-Site Scripting Vulnerability in Citrix NetScaler
                             16 November 2018


        AusCERT Security Bulletin Summary

Product:           Citrix NetScaler Gateway
Publisher:         Citrix
Operating System:  Network Appliance
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-18517  

Original Bulletin: 

Revision History:  November 16 2018: Updated applicable products
                   November  6 2018: Updated description to include Citrix ADC
                   October  30 2018: Updated description and version numbering
                   October  24 2018: Initial Release

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Cross-Site Scripting Vulnerability in Citrix NetScaler

Security Bulletin    | Medium
Created: 23 Oct 2018 | Modified: 15 Nov 2018

Applicable Products

  o NetScaler 10.5
  o NetScaler 11.1
  o NetScaler 12.0
  o NetScaler 12.1
  o Citrix ADC

Description of Problem

A Cross-Site Scripting (XSS) vulnerability has been identified in Citrix
NetScaler Gateway, formerly known as Citrix Access Gateway Enterprise Edition
and Citrix ADC formerly known as NetScaler ADC,  that if exploited by an
attacker with access to the NetScaler administrative user interface including
the management interface, could potentially be used to execute malicious
client-side script in the same context as legitimate content from the web
server; if this vulnerability is used to execute script in the browser of an
authenticated user then the script may be able to gain access to the
authenticated user's session or other potentially sensitive information.

This vulnerability has been assigned the following CVE number:

o CVE-2018-18517: Cross-Site Scripting vulnerability in Citrix NetScaler

This vulnerability is present in the following versions of Citrix NetScaler
Gateway and Citrix ADC:

10.5.x earlier than version

11.1.x earlier than version

12.0.x earlier than version

12.1.x earlier than version

What Customers Should Do

This vulnerability has been addressed in new versions of the Citrix NetScaler
Gateway and Citrix ADC software. Citrix recommends that customers upgrade their
Citrix NetScaler Gateway and Citric ADC appliances to one of the following
versions: and later and later and later and later

These upgrades can be obtained from the Citrix website at the following

Citrix NetScaler Gateway:


Citrix ADC:


Please note that a MyCitrix account is required to access this location.

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 Gateway appliances in line with industry best
practice, network access to this interface should already be restricted.


Citrix thanks Davide Peruzzi of gosecure.it for working with us on
CVE-2018-18517 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


|Date                   |Change                                               |
|October 23rd 2018      |Initial bulletin published                           |
|October 25th 2018      |Updated description and version numbering            |
|November 5th 2018      |Updated description to include Citrix ADC            |
|November 15th 2018     |Updated applicable products                          |

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