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Vulnerability Note VU#347188

Microsoft Internet Explorer 7 may allow address bar spoofing

Overview

Internet Explorer 7 may allow address bar spoofing in pop-up windows. This could let an attacker spoof the address of a web site.

I. Description

Internet Explorer 7 includes a new feature called "Address bar protection." This makes sure that every window, including pop-ups, will present an address bar to the user. By using a specially crafted URI, an attacker can spoof this address bar in a pop-up window.

II. Impact

This vulnerability could be used to convince a user that the intruder's web site was actually a web site that the user trusts and might provide sensitive information to.

III. Solution

We are currently unaware of a practical solution to this problem.

Disable Active scripting

Disabling Active scripting in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this vulnerability. Instructions for disabling Active scripting in the Internet Zone can be found in the "Securing Your Web Browser" document.

Verify web site certificates

Before providing sensitive information to a web site, verify the site's certificate as specified in US-CERT Cyber Security Tip ST05-010.

Systems Affected

VendorStatusDate Updated
Microsoft CorporationVulnerable26-Oct-2006

References

http://www.us-cert.gov/reading_room/securing_browser/#Internet_Explorer
http://secunia.com/advisories/22542/
http://isc.sans.org/diary.php?storyid=1804
http://secunia.com/internet_explorer_7_popup_address_bar_spoofing_test/
http://www.microsoft.com/windows/ie/ie7/about/features/default.mspx
http://blogs.msdn.com/ie/archive/2005/11/21/495507.aspx

Credit

This vulnerability was publicly disclosed by Secunia.

This document was written by Will Dormann.

Other Information

Date Public10/25/2006
Date First Published10/26/2006 01:54:59 PM
Date Last Updated10/26/2006
CERT Advisory 
CVE Name 
US-CERT Technical Alerts 
Metric2.83
Document Revision5

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