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UNIRAS Brief - 735/06 - iDefense Security Advisory: Citrix Presentation Server 4.0 IMA Service Invalid



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______________________________________________________________________________

 UNIRAS (UK Government CERT) Briefing - 735/06 dated 10.11.06 time 14:00
 UNIRAS is part of NISCC (the UK National Infrastructure Security
 Co-ordination Centre)
______________________________________________________________________________

 UNIRAS material is available from the NISCC website at www.niscc.gov.uk
______________________________________________________________________________

Title
=====

iDefense Security Advisory: Citrix Presentation Server 4.0 IMA Service Invalid 
Name Length DoS Vulnerability

Detail
======

Remote exploitation of an input validation error in Citrix Systems Inc.'s
Metaframe Presentation Server 4.0 IMA service may allow an attacker to
cause a denial of service (DoS) condition.


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

                          ESB-2006.0827 -- [Win]
          Citrix Presentation Server 4.0 IMA Service Invalid Name
                         Length DoS Vulnerability
                             10 November 2006

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

        
Product:              Citrix Presentation Server
Publisher:            iDEFENSE
Operating System:     Windows
Impact:               Denial of Service
Access:               Remote/Unauthenticated

Original Bulletin:    http://support.citrix.com/article/CTX111186

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Citrix Presentation Server 4.0 IMA Service Invalid Name Length DoS
Vulnerability

iDefense Security Advisory 11.09.06
http://labs.idefense.com/intelligence/vulnerabilities/
Nov 09, 2006

I. BACKGROUND

Citrix Presentation Server is a product designed to allow remote access to
applications over a network.  More information can be found at the Citrix's
web site:
http://www.citrix.com/English/ps2/products/product.asp?contentID=186.

II. DESCRIPTION

Remote exploitation of an input validation error in Citrix Systems Inc.'s
Metaframe Presentation Server 4.0 IMA service may allow an attacker to
cause a denial of service (DoS) condition.

The IMA (Independent Management Architecture) server component Citrix's
Presentation Server (previously known as Metaframe) contains an input
validation error in the handling of certain packet types. By constructing a
specific packet, it is possible to cause the service to reference an
unmapped memory address. This causes an unhandled exception, which in turn
causes the service to exit, resulting in a DoS condition.

III. ANALYSIS

Successful exploitation of this vulnerability would allow a remote attacker
to cause the IMA server component of the Citrix Presentation Server to
crash, preventing access to the resources being shared on the server.

IV. DETECTION

This vulnerability has been confirmed to affect Citrix Presentation Server
4.0.  Previous versions may also be affected.

V. WORKAROUND

iDefense is unaware of any effective workarounds for this vulnerability.

VI. VENDOR RESPONSE

The vendor has released the following advisory to address this issue:

http://support.citrix.com/article/CTX111186

VII. CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.

VIII. DISCLOSURE TIMELINE

07/03/2006  Initial vendor notification
07/05/2006  Initial vendor response
11/09/2006  Coordinated public disclosure

IX. CREDIT

This vulnerability was reported to iDefense by Eric Detoisien.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

Copyright C 2006 iDefense, Inc.

Permission is granted for the redistribution of this alert electronically.
It may not be edited in any way without the express written consent of
iDefense. If you wish to reprint the whole or any part of this alert in
any other medium other than electronically, please e-mail
customerservice@xxxxxxxxxxxx for permission.

Disclaimer: The information in the advisory is believed to be accurate at
the time of publishing based on currently available information. Use of
the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on, this
information.


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UNIRAS wishes to acknowledge the contributions of iDefense for the
information contained in this briefing.
______________________________________________________________________________

This notice contains information released by the original author.
Some of the information may have changed since it was released. If the
vulnerability affects you, it may be prudent to retrieve the advisory
from the site of the original source to ensure that you receive the most
current information concerning that problem.

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Teams (IRTs) in order to foster cooperation and coordination in incident
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<End of UNIRAS Briefing>

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