Citrix EPA ActiveX Control Design Flaw

Credit: Michael White
Risk: High
Local: No
Remote: Yes
CWE: CWE-Other

CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Symantec Vulnerability Research Security Advisory Advisory ID: SYMSA-2007-006 Advisory Title: Citrix EPA ActiveX Control Design Flaw Author: Michael White / michael_white (at) symantec (dot) com [email concealed] 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: 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 Recommendation: 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 (, which standardizes names for security problems. CVE-2007-3679 - -------Symantec Vulnerability Research Advisory Information------- For questions about this advisory, or to report an error: research (at) symantec (dot) com [email concealed] For details on Symantec's Vulnerability Reporting Policy: Symantec Vulnerability Research Advisory Archive: Symantec Vulnerability Research GPG Key: - -------------Symantec Product Advisory Information------------- To Report a Security Vulnerability in a Symantec Product: secure (at) symantec (dot) com [email concealed] For general information on Symantec's Product Vulnerability reporting and response: Symantec Product Advisory Archive: Symantec Product Advisory PGP Key: sc - --------------------------------------------------------------- Copyright (c) 2007 by Symantec Corp. Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Consulting Services. Reprinting the whole or part of this alert in any medium other than electronically requires permission from research (at) symantec (dot) com. [email concealed] Disclaimer The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. Symantec, Symantec products, and Symantec Consulting Services are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) iD8DBQFGnRXXuk7IIFI45IARAla8AKDKwcYD23htC+trwq1Ke5Qvam99YACfUgJh VynDvAnppLmojz2wbrLfR+U= =QakL -----END PGP SIGNATURE-----

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