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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2007.0029 -- AUSCERT ALERT
                                   [Win]
        Citrix Presentation Server Client for Windows vulnerability
                         allows remote compromise
                               2 March 2007

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        AusCERT Alert Summary
        ---------------------

Product:              Citrix Presentation Server Client prior to 10.0
                      ICA Win32 Program Neighborhood Client
                      ICA Win32 Program Neighborhood Agent
                      ICA Win32 Web Client
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
Member content until: Friday, March 30 2007

OVERVIEW:

	The Citrix Presentation Server Client on the Windows platform contains
	a remotely exploitable vulnerability that may be triggered when the
	user visits a malicious web page in their web browser.

	Citrix states that most deployments are likely to be vulnerable to
	this issue. [1]


IMPACT:

	A remote attacker may compromise the client computer when the user 
	visits a malicious web page, executing arbitrary code with the 
	privileges of the user.

	After compromising the client computer an attacker may then also
	compromise the security of future Citrix sessions.


MITIGATION:

	Version 10.0 of the Citrix Presentation Server Clients have been 
	released fixing this vulnerability. These are available for download at 

	http://www.citrix.com/English/SS/downloads/downloads.asp?dID=2755


REFERENCES:

	[1] Citrix advisory CTX112589
	    http://support.citrix.com/article/CTX112589


AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. 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.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
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.
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