Microsoft Security Bulletin (MS00-083)
Patch Available for "Netmon Protocol Parsing" Vulnerability
Originally posted: November 01, 2000
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Windows NT(r) and Windows(r) 2000
server products and Systems Management Server. The vulnerability
could allow a malicious user to gain control of an affected server.
Frequently asked questions regarding this vulnerability and
the patch can be found at
Microsoft ships two versions of Network Monitor (Netmon): a basic
version that ships with Windows NT 4.0 and Windows 2000 server
products, and full version that ships as part of Systems Management
Server (SMS) 1.2 and 2.0. Both versions include protocol parsers that
aid administrators in interpreting and analyzing previously-captured
network data. However, several of the parsers have unchecked buffers.
If a malicious user delivered a specially-malformed frame to a server
that was monitoring network traffic, and the administrator parsed it
using an affected parser, it would have the effect of either causing
Netmon to fail or causing code of the malicious user's choice to run
on the machine.
Netmon requires administrative privileges to run, but should only be
run by local, rather than domain, administrators. If this is done,
the vulnerability could be used to gain complete control over the
local machine, but could not be used to gain control over a domain.
Netmon does not ship on workstation products, so unless SMS had been
installed on a workstation, it would not be affected by this
Affected Software Versions
- Microsoft Windows NT 4.0 Server
- Microsoft Windows NT 4.0 Server, Terminal Server Edition
- Microsoft Windows NT 4.0 Server, Enterprise Edition
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Datacenter Server
- Microsoft Systems Management Server 1.2
- Microsoft Systems Management Server 2.0
Note: Netmon does not ship as part of Windows NT 4.0 Workstation or
Windows 2000 Professional. These products would only be affected if
SMS had been installed on them.
- Microsoft Windows NT 4.0 Server and Windows NT 4.0 Server,
- Microsoft Windows NT 4.0 Server, Terminal Server Edition:
To be released shortly.
- Microsoft Windows 2000 Server, Advanced Server and
- Microsoft Systems Management Server 1.2:
- Microsoft Systems Management Server 2.0:
Note: Customers who are running SMS should apply the SMS patch,
regardless of the platform they are running on. Customers who are not
running SMS but are using an affected server should apply the
operating system patch.
- The patch for Windows NT 4.0 Server and Windows NT 4.0 Server,
Enterprise Edition, should be applied atop Service Pack 6a.
It will be included in Service Pack 7.
- The patch for Windows NT 4.0 Server, Terminal Server Edition,
should be applied atop Service Pack 6. It will be included in
Service Pack 7.
- The patch for Windows 2000 can be applied to computers running
Windows 2000 "Gold" or Service Pack 1. It will be included in
Windows Service Pack 2.
- The patch for SMS 1.2 should be applied atop SMS 1.2 Service
- The patch for SMS 2.0 can be applied to SMS 2.0 Gold, Service
Pack 1, or Service Pack 2. It will be included in Service Pack 3.
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 MS00-083,
- Microsoft Knowledge Base article Q274835 discusses this issue
and will be available soon.
- 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
Microsoft thanks COVERT Labs at PGP Security, Inc.
(http://www.pgp.com/), and the ISS X-force (http://xforce.iss.net/)
for reporting this issue to us and working with us to protect
- November 01, 2000: Bulletin Created.
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Last Updated November 01, 2000