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Microsoft Security Bulletin (MS00-009)
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Patch Available for "Image Source Redirect" Vulnerability
Originally Posted: February 16, 2000
Summary
=======
Microsoft has released a patch that eliminates a security vulnerability
in Microsoft® Internet Explorer. The vulnerability could allow a
malicious web site operator to read - but not add, change or delete -
certain types of files on the computer of a visiting user.
Frequently asked questions regarding this vulnerability can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-009.asp.
Issue
=====
When a web server navigates a window from one domain into another one,
the IE security model checks the server's permissions on the new page.
However, it is possible for a web server to open a browser window to a
client-local file, then navigate the window to a page that is in the
web site's domain in such a way that the data in the client-local file
is accessible to the new window. The data would only be accessible to
the new window for a very brief period, but the result is that it
could be possible for a malicious web site operator to view files on
the computer of a visiting user. The web site operator would need to
know (or guess) the name and location of the file, and could only view
file types that can be opened in a browser window.
Affected Software Versions
==========================
Microsoft Internet Explorer 4.0 and 4.01.
Microsoft Internet Explorer 5 and 5.01.
Patch Availability
==================
http://windowsupdate.microsoft.com
http://www.microsoft.com/windows/ie/security/patch5.asp
NOTE: Microsoft produces security patches for Internet Explorer 4.01
SP2 and higher. In the event that this package is applied to Internet
Explorer 4.01 SP1, the package states that a fix is not needed. This
message is incorrect, as the vulnerability does exist on Internet
Explorer 4.01 SP1 or any earlier release. If you are using Internet
Explorer 4.01 SP1 or any earlier release, please upgrade to the latest
version of Internet Explorer to resolve this issue.
NOTE: Additional security patches are available at the Microsoft Download
Center.
More Information
================
Please see the following references for more information related to this
issue.
- Microsoft Security Bulletin MS00-009: Frequently Asked Questions.
- Microsoft Knowledge Base (KB) article. A link will be posted to
http://www.microsoft.com/technet/Security/Bulletin/ms00-009.asp
as soon as the article is available.
- Microsoft Security Advisor web site,
http://www.microsoft.com/security/default.asp
Obtaining Support on this Issue
===============================
This is a fully supported patch. Information on contacting Microsoft
Technical Support is available at
http://support.microsoft.com/support/contact/default.asp
Revisions
=========
February 16, 2000: Bulletin Created.
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(c) 2000 Microsoft Corporation. All rights reserved. Terms of Use
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This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 15:35:06 PDT