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To improve our services to our customers, we have made a number of
additions to the Secunia Advisories and have started translating the
advisories to German.

The improvements will help our customers to get a better
understanding of how we reached our conclusions, how it was rated,
our thoughts on exploitation, attack vectors, and scenarios.

This includes:
* Reason for rating
* Extended description
* Extended solution
* Exploit code or links to exploit code
* Deep links

Read the full description:
http://corporate.secunia.com/products/48/?r=l

Contact Secunia Sales for more information:
http://corporate.secunia.com/how_to_buy/15/?r=l

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TITLE:
Citrix ICA Client ActiveX Control Heap Overflow Vulnerability

SECUNIA ADVISORY ID:
SA23246

VERIFY ADVISORY:
http://secunia.com/advisories/23246/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Citrix Presentation Server Client 9.x
http://secunia.com/product/7916/

DESCRIPTION:
A vulnerability has been discovered in Citrix Presentation Server
Client, which can be exploited by malicious people to compromise a
user's system.

The vulnerability is caused due to a boundary error within the
"SendChannelData()" method in the ICA Client ActiveX control
component (WFICA.OCX). This can be exploited to cause a heap-based
buffer overflow by e.g. setting the "DataSize" and "DataType"
parameters to "1" and passing an overly long string in the "Data"
parameter.

Successful exploitation allows execution of arbitrary code when a
user e.g. visits a malicious website.

The vulnerability is confirmed in version 9.200.44376.0 included in
the Citrix Presentation Server Client Package version 9.200. Other
versions may also be affected.

SOLUTION:
Update to version 9.230 or later.

PROVIDED AND/OR DISCOVERED BY:
Andrew Christensen, FortConsult.

The vendor also credits TippingPoint and the Zero Day Initiative.

ORIGINAL ADVISORY:
Citrix:
http://support.citrix.com/article/CTX111827

FortConsult:
http://www.fortconsult.net/images/pdf/citrix_advisory_dec2006.pdf

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About:
This Advisory was delivered by Secunia as a free service to help
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vulnerabilities.

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http://secunia.com/about_secunia_advisories/


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