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             AUSCERT External Security Bulletin Redistribution

          Vulnerability in Citrix Studio Could Result in Insecure
                        Access Policy Configuration
                                2 June 2016


        AusCERT Security Bulletin Summary

Product:           Citrix XenDesktop
Publisher:         Citrix
Operating System:  Windows
Impact/Access:     Reduced Security -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-4810  

Original Bulletin: 

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Vulnerability in Citrix Studio Could Result in Insecure Access Policy 

Security Bulletin


Created: 31 May 2016

Modified: 31 May 2016

Description of Problem

A vulnerability has been identified in Citrix Studio that could allow Access 
Policy rules to be set insecurely on the Citrix XenDesktop Delivery 

This vulnerability affects the following product versions:

Citrix XenDesktop 7.x between versions 7.0 and 7.6 inclusive, including 7.6 
Long Term Service Release (LTSR)

Citrix XenApp versions 7.5 and 7.6

Citrix Studio for Citrix XenApp and XenDesktop versions 7.7 and later are not
affected by this vulnerability.

Citrix XenDesktop 5.6 and earlier, and Citrix XenApp 6.x and earlier, are not
affected by this vulnerability.

This vulnerability has been assigned the following CVE number:

CVE-2016-4810: Vulnerability in Citrix Studio Could Result in Insecure Access
Policy Configuration.

Mitigating Factors

Access policy rules that have not been edited from their default are not 
affected by this vulnerability.

What Customers Should Do

Citrix has releas

Citrix Studio 7.6.1000 or later

Customers using Citrix XenDesktop 7.6 LTSR should apply Cumulative Update 1 

This new version can be downloaded from the following location:


In addition to upgrading to a version of Citrix Studio that contains the fix 
for this issue, Citrix also recommends that all customers review their current
Access Policy rules to ensure that they reflect the intended configuration.

More information on how to accomplish this using the associated PowerShell 
script can be found in the following Knowledge Center article:


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 http://www.citrix.com/site/ss/supportContacts.asp.

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

Applicable Products

XenDesktop 5.6

XenDesktop 7

XenDesktop 7.1

XenDesktop 7.5

XenDesktop 7.6

XenDesktop 7.6 Feature Pack 3

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