Microsoft Security Bulletin (MS00-075)
Patch Available for "Microsoft VM ActiveX Component" Vulnerability
Originally posted: October 12, 2000
Microsoft has released a patch that eliminates a security
vulnerability in 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 take any desired
action on a visiting user's machine.
Frequently asked questions regarding this vulnerability and the patch
can be found at
The Microsoft VM is a virtual machine for the Win32(r) operating
environment. It runs atop Microsoft(r) Windows 95, 98, Windows Me,
Windows NT 4.0, 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, on a malicious web site to take any
desired action on a visiting user's machine.
The Microsoft virtual machine (Microsoft VM) contains functionality
that allows ActiveX controls to be created and manipulated by Java
applications or applets. This functionality is intended to only be
available to stand-alone Java applications or digitally signed
applets. However, this vulnerability allows ActiveX controls to be
created and used from a web page, or from within a HTML based e-mail
message, without requiring a signed applet. If a user visited a
malicious web site that exploited this vulnerability, a Java applet
on one of the web pages could run any desired ActiveX control, even
ones that are marked as unsafe for scripting. This would enable the
malicious web site operator to take any desired action on the user's
Web sites placed within the Restricted Sites zone in Internet
Explorer will not be able to exploit this vulnerability.
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.
- 2000-series Microsoft VM customers will be provided with an update
- 3100-series Microsoft VM customers upgrade to build 3318 or later
- 3200-series Microsoft VM customers upgrade to build 3318 or later
- 3300-series Microsoft VM customers upgrade to build 3318 or later
This fix supersedes the patch supplied in MS00-059
Note Additional security patches are available at the Microsoft
Please see the following references for more information related to
- Frequently Asked Questions: Microsoft Security Bulletin MS00-75,
- Microsoft Knowledge Base (KB) article Q275609,
this issue in more detail.
- Microsoft TechNet Security web site,
Obtaining Support on this Issue
This is a fully supported patch. Information on contacting Microsoft
Product Support Services is available at
- October 12, 2000: Bulletin Created.
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Last Updated October 12, 2000