FW: Microsoft Security Bulletin (MS00-059)

["Forrester, Mike" <mforrester () HSACORP NET>]

The text only version of this bulletin doesn't show the hyper-links to the
patches.  Use the following URL to view the on-line version:

http://www.microsoft.com/technet/security/bulletin/ms00-059.asp

Follow the hyperlinks in the "Patch Availability" section to locate the
patches based on your version of the MS Java VM.  From the FAQ listed in the
bulletin:

"How do I determine the build number for my version of the Microsoft VM?

Open a command window:
On Windows NT or Windows 2000, choose "Start", then "Run", then type "CMD"
and hit the enter key.
On Windows 95 or 98, choose "Start", then "Run" then type "COMMAND" and hit
the enter key.
At the command prompt, type "JVIEW" and hit the enter key.

The version information will be at the right of the topmost line. It will
have a format like "5.00.xxxx", where the "xxxx" is the build number. For
example, if the version number is 5.00.1234, you have build number 1234."

HTH,

Mike Forrester - Systems Security Engineer
High Speed Access Corp. - Denver, CO USA
mforrester () hsacorp net - +1 303 256 2134


-----Original Message-----
From: Microsoft Product Security [mailto:secnotif () MICROSOFT COM]
Sent: Monday, August 21, 2000 9:50 PM
To: MICROSOFT_SECURITY () ANNOUNCE MICROSOFT COM
Subject: Microsoft Security Bulletin (MS00-059)


The following is a Security  Bulletin from the Microsoft Product Security
Notification Service.

Please do not  reply to this message,  as it was sent  from an unattended
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                    ********************************

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Microsoft Security Bulletin (MS00-059)
- --------------------------------------
Patch Available for "Java VM Applet" Vulnerability
Originally posted: August 21, 2000

Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability in the Microsoft(r) virtual machine (Microsoft VM). If
a malicious web site operator were able to coax a user into visiting
his site, the vulnerability could allow him to masquerade as the
user, visit other sites using his identity, and relay the information
back to his site.

Frequently asked questions regarding this vulnerability and the patch
can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-059.asp

Issue
=====
The Microsoft VM is a virtual machine for the Win32(r) operating
environment. It runs atop Microsoft Windows(r) 95, 98, or Windows
NT(r), or Windows 2000. It ships as part of each operating system,
and also as part of Microsoft Internet Explorer. The version of the
Microsoft VM that ships with Microsoft Internet Explorer 4.x and
Internet Explorer 5.x contains a security vulnerability that could
allow a Java applet to operate outside the bounds set by the sandbox.

By design, an applet should only be able to communicate with the web
site that hosted it. However, this vulnerability would allow an
applet to bypass this restriction. If a user visited a web site
operated by a malicious user, the site could start an applet that
would be able to establish a connection with another web site and
forward any information from the web session to the malicious user's
site.

The session would be established in the guise of the visiting user,
rather than that of the malicious user. Thus, the vulnerability could
be used to access an intranet site located behind a firewall, access
information in the guise of the user, and relay it to the malicious
user. The only prerequisite is that the malicious user would need to
know or guess the name of the intranet site. Although the applet
would be able to make use of the user's credentials to authenticate
to the site, this vulnerability would not provide a
way to compromise them.

Affected Software Versions
==========================
Versions of the Microsoft VM are identified by build numbers, which
can be determined using the JVIEW tool, as discussed in the FAQ. The
following builds of the Microsoft VM are affected:
 - All builds in the 2000 series.
 - All builds in the 3100 series.
 - All builds in the 3200 series.
 - All builds in the 3300 series.

Patch Availability
==================
 - All 2000 series Microsoft VM customers:
   Install Microsoft VM build 2446

 - All 3100 series Microsoft VM customers:
   Upgrade to build 3309 and install the 3314 security patch

 - 3200 series Microsoft VM customers should do one of the following:
   All 3200 builds:
   Upgrade to build 3309 and install the 3314 security patch
   Builds 3229-3234:
   Install the security patch from Bulletin MS00-011 before
installing
   this new 3314 security patch
   Build 3240:
   Install the 3314 security patch

 - All 3300 series Microsoft VM customers should install the 3314
   security patch

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.
 - Frequently Asked Questions: Microsoft Security Bulletin MS00-059,
   http://www.microsoft.com/technet/security/bulletin/fq00-059.asp
 - Microsoft Knowledge Base (KB) article Q271752 (available soon),
   discusses this issue in more detail.
 - Microsoft TechNet Security web site,
   http://www.microsoft.com/technet/security/default.asp

Obtaining Support on this Issue
===============================
This is a fully supported patch. Information on contacting Microsoft
Product Support Services is available at
http://support.microsoft.com/support/contact/default.asp.

Revisions
=========
August 21, 2000: Bulletin Created.

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

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APPLY.

Last Updated August 21, 2000
(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.

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