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Symantec Vulnerability Research
http://www.symantec.com/research
Security Advisory
Advisory ID: SYMSA-2007-006
Advisory Title: Citrix EPA ActiveX Control Design Flaw
Author: Michael White / michael_white@symantec.com
Release Date: 19-07-2007
Application: Citrix Access Gateway
Platform: Internet Explorer/Win32
Severity: Remote arbitrary code execution
Vendor status: Patch available
CVE Number: CVE-2007-3679
Reference: http://www.securityfocus.com/bid/24865
Overview:
Citrix Access Gateway offers a clientless SSL VPN solution
implemented through a series of browser-based controls. As part of
the endpoint validation, the ActiveX control for Internet Explorer
downloads and executes a series of executable modules from the
remote server.
Details:
Researchers identified that the endpoint checking control can be
embedded in any web page and subverted to download and execute any
executable module of the attacker=92s choosing.
This vulnerability represents a design flaw in the architecture of
the endpoint validation practice.
A high level of browser trust is required to allow the endpoint
checks to function correctly, and the control is signed by Citrix
Corporation.
Vendor Response:
This has been addressed by a product update.
See http://support.citrix.com/article/CTX113815
Recommendation:
Apply the product update as detailed in
http://support.citrix.com/article/CTX113815
Common Vulnerabilities and Exposures (CVE) Information:
The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues. These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.
CVE-2007-3679
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- -------------Symantec Product Advisory Information-------------
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- ---------------------------------------------------------------
Copyright (c) 2007 by Symantec Corp.
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