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AUSCERT External Security Bulletin Redistribution
ESB-2016.1396
Vulnerability in Citrix Studio Could Result in Insecure
Access Policy Configuration
2 June 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix XenDesktop
Publisher: Citrix
Operating System: Windows
Virtualisation
Impact/Access: Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-4810
Original Bulletin:
http://support.citrix.com/article/CTX213045
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CTX213045
Vulnerability in Citrix Studio Could Result in Insecure Access Policy
Configuration
Security Bulletin
Medium
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
Controller.
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
(CU1).
This new version can be downloaded from the following location:
https://www.citrix.com/downloads/xendesktop.html
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:
https://support.citrix.com/article/ctx213417
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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