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AUSCERT External Security Bulletin Redistribution
ESB-2008.0652 -- [Win]
Microsoft Internet Explorer 6 contains a cross-domain vulnerability
27 June 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Internet Explorer 6
Publisher: US-CERT
Operating System: Windows
Impact: Cross-site Scripting
Cross-domain Scripting
Access: Remote/Unauthenticated
Original Bulletin: http://www.kb.cert.org/vuls/id/923508
Comment: Proof-of-concept code is publicly available.
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US-CERT Vulnerability Note VU#923508
Microsoft Internet Explorer 6 contains a cross-domain vulnerability
Overview
Microsoft Internet Explorer 6 is vulnerable to a cross-domain
scripting violation, which can allow a remote, unauthenticated
attacker to access the content of a web page in a different domain.
I. Description
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 in which zone or
domain a URL exists 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.
Internet Explorer 6 fails to properly enforce the cross-domain
security model when a page location is modified through use of a new
String() object.
Proof-of-concept code that demonstrates this vulnerability is publicly
available.
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.
III. Solution
We are currently unaware of a practical solution to this problem.
Please consider the following workarounds:
Apply an update
This vulnerability does not appear to affect Internet Explorer 7.
Therefore, updating to Internet Explorer 7 may mitigate this
vulnerability.
Disable Active Scripting
This vulnerability can be mitigated by disabling Active Scripting, as
specified in the "Securing Your Web Browser" document.
Systems Affected
Vendor Status Date Updated
Microsoft Corporation Vulnerable 26-Jun-2008
References
http://www.cert.org/advisories/CA-2000-02.html
http://www.ph4nt0m.org-a.googlepages.com/PSTZine_0x02_0x04.txt
http://secunia.com/advisories/30857/
http://blogs.zdnet.com/security/?p=1348
Credit
This vulnerability was publicly disclosed by rayh4c.
This document was written by Will Dormann.
Other Information
Date Public 06/18/2008
Date First Published 06/26/2008 11:27:57 AM
Date Last Updated 06/26/2008
CERT Advisory CA-2000-02
CVE Name
US-CERT Technical Alerts
Metric 29.83
Document Revision 8
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