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AUSCERT External Security Bulletin Redistribution
ESB-2014.1160
Vulnerability in Citrix XenDesktop could result in unauthori
zed access to another user's desktop
14 July 2014
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix XenDesktop
Publisher: Citrix
Operating System: Windows
Citrix XenServer
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2014-4700
Original Bulletin:
http://support.citrix.com/article/CTX139591
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Vulnerability in Citrix XenDesktop could result in unauthorized access to
another user's desktop
CTX139591
Created On Jul 10, 2014
Updated On Jul 11, 2014
Security Bulletin
Severity: High
Description of Problem
A vulnerability has been identified in Citrix XenDesktop that could result in
a user gaining unauthorized interactive access to another users desktop.
This vulnerability affects a specific, non-default configuration of Citrix
XenDesktop 7 (all versions), Citrix XenDesktop 5 (up to and including Rollup
5.6.300 for Citrix XenDesktop 5.6 FP1) and Citrix XenDesktop 4 (all versions).
This vulnerability only affects Citrix XenDesktop deployments that use pooled
random desktop groups and where the broker configuration setting
ShutdownDesktopsAfterUse is set to disabled. Configurations that only use
assigned desktop groups, including RemotePC access scenarios and
user-dedicated desktops, are not affected by this issue.
This vulnerability has been assigned the following CVE number:
* CVE-2014-4700: Vulnerability in Citrix XenDesktop versions 7.x, 5.x and
4.x could result in unauthorized access to another users desktop.
Mitigating Factors
The configuration setting ShutdownDesktopsAfterUse is enabled by default in
configurations that use pooled desktops groups to reset the disk image and
clean the desktop. For more details, please see the following Citrix
Knowledgebase article:
https://support.citrix.com/article/CTX127842
What Customers Should Do
Updates to Citrix XenDesktop have been released to address this issue. Citrix
strongly recommends that affected customers apply these updates as soon as
possible.
The hotfixes for Citrix XenDesktop 7.1 and 7.5 can be downloaded from the
following locations:
CTX140362 Hotfix XD710ICAWSWX86005 - For VDA Core Services 7.1/7.5 for Windows
Desktop OS (32-bit) - English
CTX140363 Hotfix XD710ICAWSWX64005 - For VDA Core Services 7.1/7.5 for Windows
Desktop OS (64-bit) - English
A VDA Rollup for Citrix XenDesktop 5.6 FP1 can be downloaded from the
following location:
CTX138550 Hotfix Rollup XD560VDAWX86400 (Version 5.6.400) - For Citrix
XenDesktop Virtual Desktop Agent Core Services x86 - English
CTX138551 Hotfix Rollup XD560VDAWX64400 (Version 5.6.400) - For Citrix
XenDesktop Virtual Desktop Agent Core Services x64 - English
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 to Citrix
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 Common Criteria
XenDesktop 5.6 x32
XenDesktop 5.6 x64
XenDesktop 7
XenDesktop 7.1
XenDesktop 7.5
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