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ESB-2014.1160 - [Win][Virtual] Citrix XenDesktop: Unauthorised access - Existing account

Date: 14 July 2014

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             AUSCERT External Security Bulletin Redistribution

       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:

- --------------------------BEGIN INCLUDED TEXT--------------------

Vulnerability in Citrix XenDesktop could result in unauthorized access to 
another user's desktop


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:

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 

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

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

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

- --------------------------END INCLUDED TEXT--------------------

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