-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0877
         Vulnerability in Citrix Receiver with Online Plug-in for
             Windows could result in arbitrary code execution
                             13 September 2012

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

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

Product:           Citrix Receiver
                   Citrix XenApp Plugin for Windows
Publisher:         Citrix
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-4603  

Original Bulletin: 
   http://support.citrix.com/article/CTX134681

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

Vulnerability in Citrix Receiver with Online Plug-in for Windows could result
in arbitrary code execution

Document ID: CTX134681 / Created On: Sep 12, 2012 / Updated On: Sep 12, 2012 

Severity: Medium 

Description of Problem 

A vulnerability has been identified in the Citrix Receiver with Online Plug-in 
for Windows that could potentially allow an attacker to execute arbitrary code 
on the client device in the context of the currently logged in user. 

This vulnerability is present in all versions of the Citrix Receiver for 
Windows up to and including version 3.2 and all versions of the Citrix Online 
Plug-in for Windows up to and including version 12.1. 

This vulnerability has been assigned the following CVE: 

CVE-2012-4603 

What Customers Should Do 

This vulnerability has been addressed in the following products: 

- - The Citrix Receiver for Windows version 3.3 with Online Plug-in for Windows 
version 13.3 and later 
- - Version 12.3 of the Citrix Online Plug-in for Windows. 

Citrix recommends that customers upgrade their Citrix Receivers and Online 
Plug-ins to these versions and later. These new versions can be obtained from 
the following location: 

https://www.citrix.com/English/ss/downloads/results.asp?productID=1689163 

Mitigating Factors 

To conduct a successful exploit, an attacker would have to convince a user to 
manually lauch a specially crafted malicious file from an SMB or WebDAV 
fileserver. Deployments that prevent connections to potentially untrustworthy 
fileservers will be less exposed to this vulnerability. 

Acknowledgements 

Citrix thanks Alexey Tyurin of the Digital Security Research Group 
(http://dsecrg.com/) for working with us to protect Citrix customers. 

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:

- - Receiver for Macintosh 
- - Receiver for Windows 
- - XenApp Plug-in for Windows (32/64 Bit)

- --------------------------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

iQIVAwUBUFKQku4yVqjM2NGpAQK/9w//csSXCmXXWnEp4FcO0pHDsSakhrbbjFjV
F4wPuC5Muvg0kvxS5KpEAx+0xK9HiR7Kn260XUOcjSTl4Nyzc1degmgI19fOmAsk
V92HYodNKP7gUCHR+TjOFnRIsztBj2myp71Wsfj9io0tO9ongSp8djUIlj6NDD55
y0+een+fzTlBklnOjrITP81/B0Zazus6gbELdEj2J34vi7VjBYQiXUoKksEgFBwr
uJroXj6JQIN+KMlEhntBbzt+iEvMjMqeUduDqHXDdGJE8Fbw7vRQitAFx/g2+Fr0
uofE4uS6ZMGdwoqm4hPWM9ObhMaMwG3nrr+EL/x3rM6y+sfIoENulnl/63cFVuRs
694mMwrEo1hiowdC6gaA7ISmHSDRzEzNDaOTzInPdtAlm5k9Ct6cZb+TDIxx7/G4
9XpYY2j7ek5ZookrTB6iU9WlbzKGvXgWy6RB/zx137TEmh3pvdLYcPhrys4ThZ7o
SD0/ptGXu1OgfTDybXgPG1WSd6bSyAfxv85ZNe8MvzCY9D2arTDfMzL84issxFXN
NUgYtwDyHgfS9hFXZMZEgaV4NH8aw1QhRbDYZLtGFL+uifd/B4yts682unjAaqg/
vWisgSdXD0E70rvQnlzgXZCFMfBgI7xBIyIXckXC1x2b08uokxUWOORrYIClgAVX
kFnVBKy7CmE=
=Mkj3
-----END PGP SIGNATURE-----