Patch available for Web server folder traversal vulnerability

View products that this article applies to.

This article was previously published under Q276489

We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 7.0 running on Microsoft Windows Server 2008. IIS 7.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx (http://www.microsoft.com/technet/security/prodtech/IIS.mspx)

For more information about IIS 7.0, visit the following Microsoft Web site:

http://www.iis.net/default.aspx?tabid=1 (http://www.iis.net/default.aspx?tabid=1)

IMPORTANT: If you download and install the fix included in this article onto a computer running IIS 3.0, the IIS 3.0 Web, FTP, and Proxy services will fail. This fix should only be applied to computers running IIS 4.0 or later. To verify your version of IIS, follow these steps:

Click Start, click Settings, and then click Control Panel.
Double-click Administrative Tools, and then click the Services icon.
In the Services list, locate the IIS Admin Service.

If the IIS Admin Service is listed, download and apply the fix included in this article.

If the IIS Admin Service is not listed, your version of IIS is not vulnerable to the problem that is corrected by these fixes. Therefore, no action is needed. IIS 3.0 is not vulnerable and does not need this fix. If the IIS Admin Service is not listed, your version of IIS is not vulnerable to this particular problem that is corrected by these fixes. However, IIS 3 is no longer a supported product and has no security fixes for other problems.

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SYMPTOMS

A security vulnerability exists in Internet Information Services 5.0 and Internet Information Server 4.0 that may allow a malicious user to gain access to files and folders that are located on the logical drive containing the Web folders. This vulnerability can potentially allow a Web site visitor to take a wide range of destructive actions against it, including running programs on it.

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RESOLUTION

This vulnerability is eliminated by the patch that accompanied the Microsoft File Permission Canonicalization Vulnerability (http://www.microsoft.com/technet/security/bulletin/ms00-057.mspx) Security Bulletin.

Customers who have applied the patch from MS00-057 are already protected against this vulnerability and do not need to take additional action. If you are using IIS 4.0 or IIS 5.0, Microsoft strongly urges you to apply the patch immediately, if you have not already done so. For more information about how to obtain this patch, click the following article number to view the article in the Microsoft Knowledge Base:

269862 (http://support.microsoft.com/kb/269862/ ) Patch released for canonicalization error issue

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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MORE INFORMATION

Additional information about this issue is available from the following Microsoft Web site:

http://www.microsoft.com/technet/security/bulletin/MS00-078.mspx (http://www.microsoft.com/technet/security/bulletin/MS00-078.mspx)

http://www.microsoft.com/technet/security/bulletin/MS00-086.mspx (http://www.microsoft.com/technet/security/bulletin/MS00-086.mspx)

The English version of the IIS 5.0 fix should have the following file attributes or later:

   Date        Time    Version        Size     File name
   -----------------------------------------------------
   08-09-2000  1:02pm  5.0.2195.2103  357,136  W3svc.dll

The English version of the IIS 4.0 fix should have the following file attributes or later:

   Date        Time    Size     File name     Platform
   ---------------------------------------------------
   08/03/2000  05:06p  330,080  Asp.dll       Intel
   08/03/2000  05:04p  185,792  Infocomm.dll  Intel
   08/03/2000  05:05p   38,256  Ssinc.dll     Intel
   08/03/2000  05:05p   25,360  Sspifilt.dll  Intel
   08/03/2000  05:05p  228,496  W3svc.dll     Intel

   08/03/2000  05:08p  551,696  Asp.dll       Alpha
   08/03/2000  05:06p  304,912  Infocomm.dll  Alpha
   08/03/2000  05:07p   60,176  Ssinc.dll     Alpha
   08/03/2000  05:07p   39,696  Sspifilt.dll  Alpha
   08/03/2000  05:07p  384,272  W3svc.dll     Alpha

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