Microsoft Product Support Services   All Products  |   Support  |   Search  | Home
  Support Home  |   Self Support  |   Assisted Support  |   Custom Support  |   Worldwide Support  |

HTML E-mail Link Transmits User Name and Password to Unauthorized Server

The information in this article applies to:
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server


When you click a link in a Hypertext Markup Language (HTML) document, it may be possible for a malicious user to use that link to initiate a Microsoft Windows NT LAN Manager (NTLM) challenge/response authentication process to a remote Telnet server and transmit your NTLM credentials (you user name and password) without notification.


A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to computers that are experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows 2000 service pack that contains this fix.

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:
NOTE: On September 14, 2000, Microsoft released the original version of this patch. On September 21, 2000, a new version of the patch was released. Microsoft recommends that all customers, including those who applied the original version of the patch, apply the new version.

The following file is available for download from the Microsoft Download Center. Click the file name below to download the file:
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. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

The English version of this fix should have the following file attributes or later:
   Date        Time    Size    Version      File name
   09/19/2000  01:34p  80,144  5.0.33666.1  Telnet.exe 


Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.


For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

Q249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes
For related information about this problem, please visit the following Microsoft Web site:
For additional security-related information about Microsoft products, please visit the following Microsoft Web site:

Additional query words: url uniform universal resource locator

Keywords : kbnetwork kbWin2000PreSP2Fix
Issue type : kbbug
Technology : kbwin2kAdvSer kbwin2kAdvSerSearch kbwin2kS kbwin2kSSearch kbwin2kSearch kbwin2kProSearch kbwin2kPro

Last Reviewed: November 15, 2000
2000 Microsoft Corporation. All rights reserved. Terms of Use.

Article ID: Q272743

Last Reviewed:
November 15, 2000

Send to a friend

Provided by
Microsoft Product Support Services

Did the information in this article help answer your question?

Did not apply

Please provide additional comments about this information.
(255 character max)