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From:MICROSOFT <secure_(at)_microsoft.com>
Date:18.12.2001
Subject:13 December 2001 Cumulative Patch for IE

- ----------------------------------------------------------------------
Title:      13 December 2001 Cumulative Patch for IE
Date:       13 December 2001
Software:   Internet Explorer
Impact:     Run Code of an Attacker's Choice
Max Risk:   Critical
Bulletin:   MS01-058

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-058.asp.
- ----------------------------------------------------------------------

Issue:
======
This is a cumulative patch that, when installed, eliminates all
previously discussed security vulnerabilities affecting IE 5.5 and
IE 6. In addition, it eliminates three newly discovered
vulnerabilities.

- The first vulnerability involves a flaw in the handling of the
  Content-Disposition and Content-Type header fields in an HTML.
  stream. These fields, the hosting URL, and the hosted file data
  determine how a file is handled upon download in Internet
  Explorer. A security vulnerability exists because, if an
  attacker altered the HTML header information in a certain way,
  it could be possible to make IE believe that an executable file
  was actually a different type of file -- one that it is
  appropriate to simply open without asking the user for
  confirmation. This could enable the attacker to create a web
  page or HTML mail that, when opened, would automatically run an
  executable on the user's system. This vulnerability affects
  IE 6.0 only. It does not affect IE 5.5.

- The second vulnerability is a newly discovered variant of the
  "Frame Domain Verification" vulnerability discussed in Microsoft
  Security Bulletin MS01-015. The vulnerability could enable a
  malicious web site operator to open two browser windows, one in
  the web site's domain and the other on the user's local file
  system, and to pass information from the latter to the former.
  This could enable the web site operator to read, but not change,
  any file on the user's local computer that could be opened in a
  browser window. This vulnerabilty affects both IE 5.5 and 6.0.

- The third vulnerability involves a flaw related to the display
  of file names in the File Download dialogue box. When a file
  download is initiated, a dialogue provides the name of the file.
  However, in some cases, it would be possible for an attacker to
  misrepresent the name of the file in the dialogue. This could be
  invoked from a web page or in an HTML email in an attempt to
  fool users into accepting unsafe file types from a trusted
  source. This vulnerabilty affects both IE 5.5 and 6.0.

Mitigating Factors:
====================
File Execution Vulnerability:

- The vulnerability could not be exploited if File Downloads have
  been disabled in the Security Zone from which the file is being
  received. In most attempts to maliciously exploit this
  vulnerability the file would be received from the Internet or
  Intranet zone. Therefore, disabling File Downloads in these zones
  can protect customers. This is not the default setting for either
  of these zone, however.

- This affects IE 6.0 only.

Frame Domain Verification Variant:
- The vulnerability could only be used to view files. It could not
  be used to create, delete, modify or execute them.

- The vulnerability would only allow an attacker to read files that
  can be can be opened in a browser window, such as image files,
  HTML files and text files. Other file file types, such as binary
  files, executable files, Word documents, and so forth, could not
  be read.

- The attacker would have to have knowledge of the exact file name
  and location in other to successfully read the file on the
  local system.

File Name Spoofing Vulnerability:
- The determination on choosing to accept a file download from an
  Internet site should always be based on the trustworthiness of
  the source and not on the file type. File downloads should never
  be accepted from an untrusted source, no matter how harmless the
  type may appear to be.

Risk Rating:
============
- Internet systems: Critical
- Intranet systems: Critical
- Client systems: Critical

Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
  Security Bulletin at
  http://www.microsoft.com/technet/security/bulletin/ms01-058.asp
  for information on obtaining this patch.

Acknowledgment:
===============
- Jouko Pynnonen of Oy Online Solutions Ltd
  (http://www.solutions.fi/index.cgi/?lang=eng)

- ---------------------------------------------------------------------

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