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AUSCERT External Security Bulletin Redistribution
ESB-2006.0435 -- [Win]
Microsoft Internet Explorer HTML Document object cross-domain vulnerability
3 July 2006
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Internet Explorer
Publisher: US-CERT
Operating System: Windows
Impact: Cross-site Scripting
Access: Remote/Unauthenticated
CVE Names: CVE-2006-3280
Original Bulletin: http://www.kb.cert.org/vuls/id/883108
Comment: Further testing by SANS ISC has confirmed that Mozilla Firefox
is *not* vulnerable to this attack:
http://isc.sans.org/diary.php?storyid=1448
Revision History: July 3 2006: SANS changes test results for Firefox;
CVE number added
June 29 2006: Initial Release
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US-CERT Vulnerability Note VU#883108
Microsoft Internet Explorer HTML Document object cross-domain vulnerability
Overview
Microsoft Internet Explorer contains a cross-domain vulnerability in
how it handles redirected object data. This could allow an attacker
to access the content of a web page in a different domain.
I. Description
The Cross-Domain Security Model
IE uses a cross-domain security model to maintain separation between
browser frames from different sources. This model is designed to
prevent code in one domain from accessing data in a different domain.
The Internet Security Manager Object determines which zone or domain
a URL exists in and what actions can be performed. From Microsoft
Security Bulletin MS03-048:
One of the principal security functions of a browser is to ensure
that browser windows that are under the control of different Web sites
cannot interfere with each other or access each other's data, while
allowing windows from the same site to interact with each other. To
differentiate between cooperative and uncooperative browser windows,
the concept of a "domain" has been created. A domain is a security
boundary - any open windows within the same domain can interact with
each other, but windows from different domains cannot. The cross-domain
security model is the part of the security architecture that keeps
windows from different domains from interfering with each other.
The HTML Document object
The HTML Document object provides the core HTML rendering functionality
of the Internet Explorer web browser. This object is provided by the
file mshtml.dll. A web page can make use of the HTML Document object
as an ActiveX control by using the <OBJECT> tag.
The problem
The HTML Document object fails to enforce the cross-domain security
model when it encounters an HTTP redirect.
II. Impact
By convincing a user to view a specially crafted HTML document (e.g.,
a web page or an HTML email message), an attacker may be able to
obtain access to web content in another domain. The impact is similar
to that of a cross-site scripting vulnerability. For a more detailed
description of the impact of cross-site scripting vulnerabilities,
please see CERT Advisory CA-2000-02.
http://www.cert.org/advisories/CA-2000-02.html#impact
III. Solution
We are currently unaware of a practical solution to this problem.
Disable ActiveX
This vulnerability can be mitigated by disabling ActiveX, as specified
in the "Securing Your Web Browser" document.
Systems Affected
Vendor Status Date Updated
Microsoft Corporation Vulnerable 29-Jun-2006
References
http://www.us-cert.gov/reading_room/securing_browser/#Internet_Explorer
http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20060627/3d930eda/PLEBO-2006.06.16-IE_ONE_MINOR_ONE_MAJOR.obj
http://secunia.com/advisories/20825/
http://isc.sans.org/diary.php?storyid=1448&rss
http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3
Credit
This vulnerability was publicly disclosed by Plebo Aesdi Nael.
This document was written by Will Dormann.
Other Information
Date Public 06/27/2006
Date First Published 06/28/2006 03:17:02 PM
Date Last Updated 06/29/2006
CERT Advisory
CVE Name
Metric 11.34
Document Revision 9
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