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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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