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AA-2006.0097                  AUSCERT Advisory

                                   [Win]
    Citrix client ActiveX control remote buffer overflow vulnerability
                              8 December 2006
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        AusCERT Advisory Summary
        ------------------------

Product:              Citrix Presentation Server Client 9.229 and prior
                      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
CVE Names:            CVE-2006-6334
Member content until: Friday, January 05 2007


OVERVIEW:

	The Citrix Presentation Server Client on the Windows platform 
	provides an ActiveX control Wfica.ocx that has a remotely exploitable 
	buffer overflow vulnerability.


IMPACT:

	If a user visits a malicious web page in Internet Explorer, a remote 
	attacker may compromise the client computer, 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 9.230 of the Citrix Presentation Server Client Package has
	now been released fixing this vulnerability. [3]


REFERENCES:

	[1] Citrix advisory CTX111827
	    http://support.citrix.com/article/CTX111827

	[2] 3COM advisory
	    http://www.tippingpoint.com/security/advisories/TSRT-06-15.html

	[3] Citrix client downloads
	    http://www.citrix.com/English/SS/downloads/downloads.asp?dID=2755


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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