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Symantec Vulnerability Research
Advisory ID: SYMSA-2007-006
Advisory Title: Citrix EPA ActiveX Control Design Flaw
Author: Michael White / email@example.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
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
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
This has been addressed by a product update.
Apply the product update as detailed in
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.
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