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AUSCERT External Security Bulletin Redistribution
Weakness in Citrix XenDesktop could result in inconsistent
propagation of USB redirection policy changes
13 December 2012
AusCERT Security Bulletin Summary
Product: Citrix XenDesktop
Operating System: Windows
Impact/Access: Unauthorised Access -- Existing Account
CVE Names: CVE-2012-6314
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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
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:
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
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 firstname.lastname@example.org
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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