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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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DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING

THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION

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POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE

EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR

INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT

APPLY.



Last Updated August 21, 2000

(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.



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