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Q280119: Patch Available for NTLMSSP Privilege Elevation Vulnerability

Article: Q280119
Product(s): Microsoft Windows NT
Version(s): 4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Operating System(s): 
Keyword(s): kbpatch kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECHac
Last Modified: 08-MAY-2002

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The information in this article applies to:

- Microsoft Windows NT Server versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4, 4.0 SP5, 4.0 SP6a 
- Microsoft Windows NT Server, Enterprise Edition versions 4.0, 4.0 SP4, 4.0 SP5, 4.0 SP6a 
- Microsoft Windows NT Server versions 4.0, 4.0 SP4, 4.0 SP5, 4.0 SP6, Terminal Server Edition 
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SYMPTOMS
========

Microsoft has released a patch that eliminates a security vulnerability in
Microsoft Windows NT 4.0. The vulnerability can allow a user who is locally
logged on to the computer to grant themselves administrator-level privileges.

A flaw in the NTLM Security Support Provider (NTLMSSP) service can potentially
allow a non-administrative user to gain administrative control of the computer.
To do this, the user needs a valid logon account and the ability to run
arbitrary code on the computer.

This vulnerability can be exploited only by a malicious user who can
interactively log on to the affected computer; however, it is recommended that
unprivileged users not be allowed to interactively log on to business-critical
servers like domain controllers, Enterprise Resource Planning (ERP) servers,
print and file servers, database servers, and so on. If unprivileged users are
not allowed to interactively log on to business-critical servers,
business-critical servers are not at risk from this vulnerability and, as a
result, the computers that are most likely to be affected by this vulnerability
are workstations and Terminal Servers.

RESOLUTION
==========

Windows NT 4.0
--------------

To resolve this problem, obtain the individual package referenced below or obtain
the Windows NT 4.0 Security Rollup Package. For additional information on the
SRP, click the article number below to view the article in the Microsoft
Knowledge Base:

  Q299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)

The following file is available for download from the Microsoft Download Center:

  US English:
  DownloadDownload Q280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27804)

  Czech:
  DownloadDownload Czeq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27945)

  Danish:
  DownloadDownload Danq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27946)

  Dutch:
  DownloadDownload Nldq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27952)

  Finnish:
  DownloadDownload Finq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27948)

  French:
  DownloadDownload Frnq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27949)

  Hungarian:
  DownloadDownload Hunq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27950)

  Italian:
  DownloadDownload Itaq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27951)

  Norwegian:
  DownloadDownload Norq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27953)

  Polish:
  DownloadDownload PolQ280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27954)

  Portuguese (Brazil):
  DownloadDownload Braq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27944)

  Russian:
  DownloadDownload Rusq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27955)

  Spanish:
  DownloadDownload Spaq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27947)

  Swedish:
  DownloadDownload Sveq280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27956)

For additional information about how to download Microsoft Support files, click
the article number below to view the article in the Microsoft Knowledge Base:

  Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft used the most current virus detection software available on the date of
posting to scan this file for viruses. After it is posted, the file is housed on
secure servers that prevent any unauthorized changes to the file.

The English-language version of this fix should have the following file
attributes or later:

  Date        Time   Size    File name     Platform
  -------------------------------------------------
  11/22/2000  3:20p  36,112  Ntlmssps.dll  Intel

NOTE: Due to file dependencies, this hotfix requires Microsoft Windows NT 4.0
Service Pack 6a (SP6a).



Windows NT Server 4.0, Terminal Server Edition
----------------------------------------------

To resolve this problem, either obtain the hotfix referenced in this section or
the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package
(SRP). For additional information about the SRP, click the article number below
to view the article in the Microsoft Knowledge Base:

  Q317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup
  Package

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems that are determined to be at risk of attack. Please evaluate your
computer's physical accessibility, network and Internet connectivity, and other
factors to determine the degree of risk to your computer. Please see the
associated Microsoft Security Bulletin
(http://www.microsoft.com/technet/security/bulletin/ms01-008.asp) to help make
this determination. This fix may receive additional testing at a later time, to
further ensure product quality. If your computer is sufficiently at risk,
Microsoft recommends that you apply this fix now.

To resolve this problem immediately, download the fix as instructed below or
contact Microsoft Product Support Services to obtain the fix. For a complete
list of Microsoft Product Support Services phone numbers and information on
support costs, please go to the following address on the World Wide Web:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

The following file is available for download from the Microsoft Download Center:

  US English:
  DownloadDownload Q280119i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27824)

For additional information about how to download Microsoft Support files, click
the article number below to view the article in the Microsoft Knowledge Base:

  Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft used the most current virus detection software available on the date of
posting to scan this file for viruses. After it is posted, the file is housed on
secure servers that prevent any unauthorized changes to the file.

The English-language version of this fix should have the following file
attributes or later:

  Date        Time    Size    File name     Platform
  --------------------------------------------------
  01/26/2001  09:01p  35,600  Ntlmssps.dll  Intel

NOTE: Due to file dependencies, this hotfix requires Microsoft Windows NT Server
4.0, Terminal Server Edition Service Pack 6 (SP6).



STATUS
======

Windows NT Server 4.0
---------------------

Microsoft has confirmed that this problem could result in some degree of security
vulnerability in Microsoft Windows NT 4.0.

Windows NT Server 4.0, Terminal Server Edition
----------------------------------------------

Microsoft has confirmed that this problem could result in some degree of security
vulnerability in Windows NT Server 4.0, Terminal Server Edition.

MORE INFORMATION
================

For more information about this vulnerability, view the following Microsoft Web
site:

  http://www.microsoft.com/technet/security/bulletin/ms01-008.asp

Additional query words: security_patch _ ntlmssps dll kbtsesrp

======================================================================
Keywords          : kbpatch kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECHack 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp5 kbWinNTSEnt400sp4 kbWinNTSEnt400 kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServ400sp5 kbNTTermServ400sp6 kbNTTermServSearch kbWinNTSEnt400SP6a
Version           : :4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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