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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.1184
        Weakness in Citrix XenDesktop could result in inconsistent
               propagation of USB redirection policy changes
                             13 December 2012

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Citrix XenDesktop
Publisher:         Citrix
Operating System:  Windows
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-6314  

Original Bulletin: 
   http://support.citrix.com/article/CTX135813

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Weakness in Citrix XenDesktop could result in inconsistent propagation of USB 
redirection policy changes

Document ID: CTX135813
Created On: Dec 11, 2012
Updated On: Dec 11, 2012

Severity: Low

Description of Problem

The USB redirection feature of Citrix XenDesktop allows a user to redirect USB 
devices on the client to their XenDesktop Virtual Desktop Agent (VDA).

A weakness has been identified in the Citrix XenDesktop VDA implementation of 
USB redirection that could result in changes to the server-side policy 
controlling USB redirection not being propagated to the VDA. This could allow 
an authenticated user to gain access to their USB devices in contravention of 
the updated administrator-defined policy.

This issue affects all versions of Citrix XenDesktop Virtual Desktop Agent 
5.x, up to and including version 5.6.

This vulnerability has been assigned the following CVE number:

     CVE-2012-6314

Mitigating Factors

Only customers that have modified server-side policy to disable USB redirection 
are affected by this weakness.

What Customers Should Do

A new version of the VDA has been released to address this issue. Citrix 
recommends that affected customers upgrade to this version of the VDA, which 
can be downloaded from the following locations:

Citrix XenDesktop 5.6 FP1 VDA x64:

EN: CTX135456 - Rollup XD560VDAWX64200 (Version 5.6.200) - For Citrix 
XenDesktop Virtual Desktop Agent Core Services x64 - English

JA: CTX135446 - Rollup XD560VDAWX64200 (Version 5.6.200) - For Citrix 
XenDesktop Virtual Desktop Agent Core Services x64 - Japanese

Citrix XenDesktop 5.6 FP1 VDA x86:

EN: CTX135455 - Rollup XD560VDAWX86200 (Version 5.6.200) - For Citrix 
XenDesktop Virtual Desktop Agent Core Services x86 - English

JA: CTX135445 - Rollup XD560VDAWX86200 (Version 5.6.200) - For Citrix 
XenDesktop Virtual Desktop Agent Core Services x86 - Japanese

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. If you would like to report 
a security issue to Citrix, please compose an e-mail to secure@citrix.com 
stating the exact version of the product in which the vulnerability was found 
and the steps needed to reproduce the vulnerability.

This document applies to:

    XenDesktop 5 x32
    XenDesktop 5 x64
    XenDesktop 5.5 x32
    XenDesktop 5.5 x64
    XenDesktop 5.6 Common Criteria
    XenDesktop 5.6 x32
    XenDesktop 5.6 x64

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