Changing the URL in a specific manner may expose contents of a file (267560)

CAUSE

This issue is a variant of the vulnerability that was originally discussed in the following security bulletin and Microsoft Knowledge Base article: This new issue is simply an additional way to exploit the same vulnerability.

Because of this vulnerability, a malicious user may be able to request files from the server, which are then processed as though they were .htr files. This can result in parts of the .asp or other file's source code being sent to the malicious user.

NOTE: In theory, this vulnerability can expose sensitive data contained in the .asp files. However, in practice, it's unlikely that this would occur. The HTR processing tends to remove the very content that would be of interest to the malicious user.

Disable HTR Functionality

If you do not have business-critical .htr scripts, perform the following steps to disable the .htr functionality:

1. Open the Internet Services Manager.
2. Right-click the Web server, click Properties, click Master Properties, and then click WWW Service.
3. Click Edit, click Home Directory, and then click Configuration.
4. Remove the .htr entry.

Apply the Patch

For customers with business-critical HTR scripts who need to retain .htr functionality and therefore can't disable .htr functionality, the following patch is available that corrects these issues.

For Windows 2000

To resolve this problem, obtain the latest service pack for Windows 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base: The following file is available for download from the Microsoft Download Center:
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: 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 prevent any unauthorized changes to the file.

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

   Date        Time    Version         Size    File name
   -----------------------------------------------------
   07/07/2000  03:17p  5.00.2195.2100  46,352  Ism.dll
				

For Windows NT 4.0

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows NT 4.0 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.The following files are available for download from the Microsoft Download Center:

x86: x86 symbols: Alpha: Alpha symbols: For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: 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 prevent any unauthorized changes to the file.

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

   Date        Time    Version    Size    File name  Platform
   ----------------------------------------------------------
   06/28/2000  09:34p  4.2.748.1  54,544  Ism.dll    x86
   06/28/2000  09:30p  4.02.0748  84,752  Ism.dll    Alpha
				

<b>Some HTML text</b> 
<% 
/*Some <file://Some/> ASP/HTR code*/ 
var objConn = new ActiveXObject("Foo.bar"); 
%> 
<I>other html code</I> 
other code.
				

<b>Some HTML text</b> 
<I>other html code</I> 
other code.