copyright | disclaimer | privacy | contact  
Australia's Leading Computer Emergency Response Team
 
Search this site

 
On this site

 > HOME
 > About AusCERT
 > Membership
 > Contact Us
 > PKI Services
 > Publications
 > Sec. Bulletins
 > Conferences
 > News & Media
 > Services
 > Web Log
 > Site Map
 > Site Help
 > Member login





 

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

Date: 14 July 2014

Click here for printable version
Click here for PGP verifiable version
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             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

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

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

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

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=c95o
-----END PGP SIGNATURE-----