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             AUSCERT External Security Bulletin Redistribution

  Vulnerability in Citrix XenApp could result in arbitrary code execution
                             13 December 2012


        AusCERT Security Bulletin Summary

Product:           Citrix XenApp
Publisher:         Citrix
Operating System:  Windows Server 2008
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-5161  

Original Bulletin: 

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

Vulnerability in Citrix XenApp could result in arbitrary code execution 

Document ID: CTX135066
Created On: Dec 11, 2012
Updated On: Dec 11, 2012

Severity: High

Description of Problem

A vulnerability has been identified in the XML Service interface of XenApp 
that could potentially be used by a remote, unauthenticated attacker to 
execute arbitrary code in the context of a service account on a XenApp server.
The vulnerability could potentially be exploited by sending a specially 
crafted packet to the vulnerable component.

This vulnerability affects Citrix XenApp versions 6.5 both with, and without,
Feature Pack 1.

This vulnerability has been assigned the following CVE:


Mitigating Factors

In order to exploit this issue, the attacker would need to be able to access 
the XML Service interface. In a normal deployment, the XML Service would not 
be directly exposed to the Internet.

What Customers Should Do

Hotfixes have been released to address this issue. Citrix strongly recommends
that all customers install these hotfixes, which can be downloaded from the 
following locations:

Citrix XenApp 6.5 for Windows Server 2008 R2 with Feature Pack 1: CTX135025 -
Hotfix XA650R01W2K8R2X64033 - For Citrix XenApp 6.5 for Windows Server 2008 R2
- - English

Customers that are not able to upgrade to XenApp 6.5 with Feature Pack 1 may 
use the hotfix for the release version of XenApp 6.5 which is available at the
following location: Citrix XenApp 6.5 for Windows Server 2008 R2: CTX135499 -
Hotfix XA650W2K8R2X64036 - For Citrix XenApp 6.5 for Windows Server 2008 R2 -

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:

    XenApp 6.5 for Windows Server 2008 R2

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