Operating System:

Published:

22 August 2000

Protect yourself against future threats.

-----BEGIN PGP SIGNED MESSAGE-----

===========================================================================
              AUSCERT External Security Bulletin Redistribution
                             
           ESB-2000.224 -- Microsoft Security Bulletin (MS00-059)
             Patch Available for "Java VM Applet" Vulnerability
                               23 August 2000

===========================================================================

	AusCERT Security Bulletin Summary
	---------------------------------

Product:		Microsoft VM
Vendor:			Microsoft
Operating System:	Windows 95
			Windows 98
			Windows NT
			Windows 2000
Platform:		N/A

Impact:			Access Confidential Data
Access Required:	Remote

- --------------------------BEGIN INCLUDED TEXT--------------------

- -----BEGIN PGP SIGNED MESSAGE-----

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.

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

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT
DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING
THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION
OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER
INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF
BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT
CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
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.

- -----BEGIN PGP SIGNATURE-----
Version: PGP Personal Privacy 6.5.3

iQEVAwUBOaH4W40ZSRQxA/UrAQGNzAf/eeFuOqOc6QroSQfRXiDyj+jdsgBO1vCQ
2YVifqENCRxPUUxmnXooYH+64V++oFbcT2LgE9wZia/eWpJfdWpYylx7gTOtt3zH
dZQ7EmIZKFuNKvFQ4XXg8RMp+mF39AHmPhyMcqFOJ7C4XUH1o4vVfC9Pekn+OJJE
D1ZAQklHGAHqN30tdzqfEZOOia7qLYkmI/46bkU104alAulBez7QMutLuy5/1AK/
ZMDeG5EG5hnfJ3ypomWopS9bpYDgMzYBQ6xkFxKjBCUFTlJ8brDOOBsDJKP4Wti+
s0XY3qYnl8gCXlePTu2bV0fmYhZf4FJfuVgBbckaYE1DEDmZqPveWg==
=Xq6p
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.


-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key

iQCVAwUBOcd2xSh9+71yA2DNAQGPAgQAmyqaPG0JjggYbNyQo9xPGZ5xMxv8/cv4
mMhueawm5Hd9XUhFY84skHr8XnkqyQzENaitasO0m44nax0ZHIfbkCncIfS0P4sF
+Ot5P0T/FnUMO3s2FddE8vWTZcosrZameBy4N3G1hJQ35YdRAFRl4kFRLdaXuDAa
nXcQHIsCfOU=
=x9Kp
-----END PGP SIGNATURE-----