Microsoft KB Archive/259166

= UNC Path Can Be Used to Start Programs by Using .chm Files =

Article ID: 259166

Article Last Modified on 1/27/2007

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APPLIES TO


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 4.01 Service Pack 1
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 4.0 128-Bit Edition
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Windows 98 Standard Edition
 * Microsoft Windows 98 Second Edition

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This article was previously published under Q259166



SYMPTOMS
The HTML Help facility provides the ability to start code by using shortcuts included in HTML Help files. If a compiled HTML Help (.chm) file were referenced by a malicious Web site, it could be used to start code on a visiting user's computer without the user's approval. Such code could take any action that the user could take, including adding, changing, or deleting data, or communicating with a remote Web site.

This vulnerability is limited by the need for the malicious Web site operator to make the compiled HTML Help file accessible to the visiting user's computer. The patch described in this article removes this vulnerability by restricting the ability to use shortcuts to HTML Help files on the local computer.



For Internet Explorer 5.01 on Windows 2000
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

A patch is available that removes the vulnerability by restricting the ability to exercise shortcuts to HTML Help files on the local computer. The following file is available for download from the Microsoft Download Center:

Download Q259166_W2K_SP1_x86_en.exe now

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

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

For All Other Versions of Internet Explorer
The following file is available for download from the Microsoft Download Center:

Download Hhupd.exe now

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

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored 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     File name ---  03/06/2000  10:32a  38,912   Hh.exe 03/06/2000 11:52a  527,320  Hhctrl.ocx 04/08/1999 09:35a  155,552  Itircl.dll 04/08/1999 09:35a  138,048  Itss.dll



For Internet Explorer 5.01 on Windows 2000
Microsoft has confirmed that this is a problem in Internet Explorer 5.01 on Windows 2000. This problem was first corrected in Windows 2000 Service Pack 1.

For All Other Versions of Internet Explorer
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
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:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Keywords: kbbug kbfix kbwin2000sp1fix kbgraphxlinkcritical kbqfe kbhotfixserver KB259166

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