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securityvulnsSecurityvulnsSECURITYVULNS:DOC:17565
HistoryJul 22, 2007 - 12:00 a.m.

SYMSA-2007-006: Citrix EPA ActiveX Control Design Flaw

2007-07-2200:00:00
vulners.com
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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 / [email protected]
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’s 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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Copyright (c) 2007 by Symantec Corp.
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