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Q154087: Access Violation in Lsass.exe Due to Incorrect Buffer Size

Article: Q154087
Product(s): Microsoft Windows NT
Version(s): winnt:4.0,4.0 SP3
Operating System(s): 
Keyword(s): kberrmsg kbfile kbWinNT400sp4fix
Last Modified: 08-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Workstation version 4.0 SP3 
- Microsoft Windows NT Server version 4.0 SP3 
- Microsoft Windows NT Server version 4.0, Terminal Server Edition 
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SYMPTOMS
========

While running Windows NT, you may receive an Access Violation error message in
Lsass.exe. After this error occurs, you cannot logon locally and the
administrative tools that rely on LSA/LSARPC (such as Event Viewer and Server
Manager) do not function.

CAUSE
=====

The failure occurs when a remote client connects to the Local Security Authority
over a named pipe and passes an incorrect buffer size (fragment length).


RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or
Windows NT Server 4.0, Terminal Server Edition. For additional information,
please see the following article in the Microsoft Knowledge Base:

  Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack


Microsoft has updated Lsasrv.dll to correct this problem and posted the updated
version to the following Internet location.

NOTE: Lsa-fix has been superseded by Lsa2-fix.

For your convenience, the English version of this post-SP3 hotfix has been posted
to the following Internet location. However, Microsoft recommends that you
install Windows NT 4.0 Service Pack 4 to correct this problem.

ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/
hotfixes-postSP3/lsa2-fix/

You can find the (http://support.microsoft.com/download/support/mslfiles/the)
original hotfix at the following Microsoft ftp site:

ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/
hotfixes-postSP3/archive/lsa-fix/

WARNING: If you install the original (archived) version of this hotfix AFTER you
apply the later version, your system may become unusable. Microsoft does not
recommend you install the original hotfix after applying the later version.

STATUS
======

Microsoft has confirmed this problem could result in some degree of security
vulnerability in Windows NT version 4.0. This problem was first corrected in
Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server
Edition Service Pack 4.



Additional query words: 4.00

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Keywords          : kberrmsg kbfile kbWinNT400sp4fix 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400search kbWinNT400search kbWinNTW400sp3 kbWinNTSsearch kbWinNTS400sp3 kbWinNTS400search kbNTTermServ400 kbNTTermServSearch
Version           : winnt:4.0,4.0 SP3
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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