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Q230681: DUN Credentials Cached When Save Password Not Selected with RAS

Article: Q230681
Product(s): Microsoft Windows NT
Version(s): winnt:4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5
Operating System(s): 
Keyword(s): kbnetwork kbWinNT4sp6fix
Last Modified: 16-MAY-2002

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The information in this article applies to:

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

When you use the Dial-Up Networking client software for Microsoft RAS to connect
to a server, a dialogue box requests the user's User ID and password for the
server. In the same dialogue box is the Save Password check box, which is
intended to provide the user with the option to cache their security credentials
if desired. However, the implemented client functionality actually caches the
user's credentials regardless of whether the check box is selected or not.

RESOLUTION
==========

Windows NT Server or Workstation 4.0
------------------------------------

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the
individual software update. For information on obtaining the latest service
pack, please go to:

- http://www.microsoft.com/Windows/ServicePacks/

-or-

- Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual software update, contact Microsoft
Product Support Services. 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


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

To resolve this problem, obtain the latest service pack for 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


STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products that are
listed at the beginning of this article. This problem was first corrected in
Windows NT Server version 4.0, Terminal Server Edition Service Pack 6.

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

For information on this problem using Microsoft Routing and Remote Access Server
(RRAS) as a Dial-Up Networking client, please see the following article in the
Microsoft Knowledge Base:

  Q233303 DUN Credentials Cached When Save Password Not Selected with RRAS

Cached security credentials, including passwords, are stored and encrypted in the
registry and protected by an access control list (ACL). RAS uses Local Security
Authority (LSA) Secrets to store the entries. The default ACL values only allow
administrators and the user associated with the credentials to gain access to
these registry entries.

Additional encryption for LSA Secrets is available to provide protection for this
information when stored on backup tapes, the Emergency Repair Disk, or other
registry backups using the System Key option. For information on System Key
(Syskey.exe) functionality, please refer to the following article in the
Microsoft Knowledge Base:

  Q143475 Windows NT System Key Permits Strong Encryption of the SAM

For additional security-related information about Microsoft products, please
visit the following Microsoft Web site:

  http://www.microsoft.com/security/

Additional query words:

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Keywords          : kbnetwork kbWinNT4sp6fix 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTW400sp5 kbWinNTW400sp4 kbWinNTW400sp3 kbWinNTW400sp2 kbWinNTW400sp1 kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp5 kbWinNTSEnt400sp4 kbWinNTSEnt400 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch
Version           : winnt:4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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