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securityvulnsSecurityvulnsSECURITYVULNS:DOC:736
HistoryOct 05, 2000 - 12:00 a.m.

Security Bulletin (MS00-070)

2000-10-0500:00:00
vulners.com
21
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The following is a Security Bulletin from the Microsoft Product Security
Notification Service.

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Microsoft Security Bulletin (MS00-070)

Patch Available for Multiple LPC and LPC Ports Vulnerabilities

Originally posted: October 03, 2000

Summary

Microsoft has released a patch that eliminates several security
vulnerabilities in Microsoft(r) Windows NT(r) 4.0 and Windows(r)
2000. The vulnerabilities could allow a range of effects, from denial
of service attacks to, in some cases, privilege elevation.

Frequently asked questions regarding this vulnerability and the
patch can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-070.asp.

Issue

Several vulnerabilities have been identified in the Windows NT 4.0
and Windows 2000 implementations of LPC and LPC ports:

  • The "Invalid LPC Request" vulnerability, which affects only
    Windows NT 4.0. By levying an invalid LPC request, it would
    be possible to make the affected system fail.
  • The "LPC Memory Exhaustion" vulnerability, which affects both
    Windows NT 4.0 and Windows 2000. By levying spurious LPC
    requests, it could be possible to increase the number of
    queued LPC messages to the point where kernel memory would
    be depleted.
  • The "Predictable LPC Message Identifier" vulnerability,
    which affects both Windows NT 4.0 and Windows 2000. Any
    process that knows the identifier of an LPC message can
    access it; however, the identifiers can be predicted. In the
    simplest case, a malicious user could access other process'
    LPC ports and feed them random data as a denial of service
    attack. In the worst case, it could be possible under certain
    conditions to send bogus requests to a privileged process in
    order to gain additional local privileges
  • A new variant of the previously-reported "Spoofed LPC Port
    Request" vulnerability. (For more information, please see
    http://www.microsoft.com/technet/security/bulletin/ms00-003.asp).
    This vulnerability affects Windows NT 4.0 and Windows 2000,
    and could, under a very restricted set of conditions, allow
    a malicious user to create a process that would run under
    the security context of an already-running process,
    potentially including System processes.

Because LPC can only be used on the local machine, none of these
vulnerabilities could be exploited remotely. Instead, a malicious
user could only exploit them on machines that he could log onto
interactively. Typically, workstations and terminal servers would be
chiefly at risk, because, if normal security practices have been
followed, normal users will not be allowed to log onto critical
servers interactively. This also means that, even in the worst case,
the vulnerability would only confer additional local - not domain -
privileges on the malicious user.

Affected Software Versions

  • Microsoft Windows NT 4.0 Workstation
  • Microsoft Windows NT 4.0 Server
  • Microsoft Windows NT 4.0 Server, Enterprise Edition
  • Microsoft Windows NT 4.0 Server, Terminal Server Edition
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Datacenter Server

Patch Availability

Note: The Windows NT 4.0 patch can be installed on systems running
Service Pack 6a, and will be included in Service Pack 7. The Windows
2000 patch can be installed on systems with or without Service Pack
1, and will be included in Service Pack 2.

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.

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.

Acknowledgments

Microsoft thanks BindView's Razor Team (http://razor.bindview.com)
for reporting these issues to us and helping us protect our
customers. The issues involved in these vulnerabilities required
several months of detailed engineering, and BindView worked closely
with us throughout the process. We'd like to thank them for their
ongoing commitment to responsible reporting practices.

Revisions

  • October 03, 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 October 03, 2000

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

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