Microsoft KB Archive/260205

= MS00-030: HTTP request with a large number of dots or dot-slashes causes high CPU utilization =

Article ID: 260205

Article Last Modified on 11/21/2006

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APPLIES TO


 * Microsoft Internet Information Services 5.0
 * Microsoft Internet Information Server 4.0

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This article was previously published under Q260205



Notice
We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 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



SYMPTOMS
An HTTP GET request with a large number of dots (..) or dot-slashes (././) in the URL can cause high CPU utilization for the Inetinfo process.



CAUSE
IIS determines how to process a URL based on its extension. When there are a large number of dots or dot-slashes, the Inetinfo process consumes all the CPU power for the time that it takes to determine the right extension.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For more 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

Hotfix information
The following files are available for download from the Microsoft Download Center:

English Language Version

Arabic Language Version

Chinese (Simplified) Language Version

Chinese (Traditional) Language Version

Czech Language Version

Danish Language Version

Dutch Language Version

Finnish Language Version

French Language Version

German Language Version

Greek Language Version

Hebrew Language Version

Hungarian Language Version

Italian Language Version

Japanese Language Version

Japanese NEC Language Version

Korean Language Version

Norwegian Language Version

Polish Language Version

Portuguese (Brazilian) Language Version

Portuguese Language Version

Russian Language Version

Spanish Language Version

Swedish Language Version

Turkish Language Version

For more 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 prevent any unauthorized changes to the file.



Hotfix information
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 Microsoft Windows NT 4.0 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:

http://support.microsoft.com/contactus/?ws=support

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:

US English:

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Chinese (Simplified):

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Chinese (Traditional):

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Dutch:

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

French:

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

German:

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Japanese:

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Korean:

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Portuguese (Brazil):

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Spanish:

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Swedish:

x86: Download Myrdot4i.exe now

Alpha: Download Myrdot4a.exe now

Note Debug symbol files are required by an administrator to do both kernel and user mode debugging, providing a method to resolve global variables and function names in the loaded executable file. Click the file names below to download the symbol files.

US English:

x86: Download Myrdot4is.exe now

Alpha: Download Myrdot4as.exe now

Chinese (Simplified):

x86: Download Myrdot4is.exe now

Alpha: Download Myrdot4as.exe now

Chinese (Traditional):

x86: Download Myrdot4is.exe now

Alpha: Download Myrdot4as.exe now

German:

x86: Download Myrdot4is.exe now

Alpha: Download Myrdot4as.exe now

Japanese:

x86: Download Myrdot4is.exe now

Alpha: Download Myrdot4as.exe now

Korean:

x86: Download Myrdot4is.exe now

Alpha: Download Myrdot4as.exe now

For more 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 prevent any unauthorized changes to the file.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table.   Date     Time     Version    Size     File name     Platform 4/24/00 12:11PM  4.2.743.1  228,496  W3svc.dll     x86 4/24/00 12:11PM  4.2.743.1   25,360  Sspifilt.dll  x86 4/24/00 12:11PM  4.2.743.1   38,256  Ssinc.dll     x86 4/24/00 12:10PM  4.2.743.1  185,760  Infocomm.dll  x86

Security Rollup Package information
To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package (SRP). For more information about the SRP, click the following article number to view the article in the Microsoft Knowledge Base:

317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package



Windows 2000
Microsoft has confirmed that this is a problem in Internet Information Services 5.0. This problem was first corrected in Windows 2000 Service Pack 1.

Windows NT 4.0
Microsoft has confirmed that this is a problem in Internet Information Server 4.0.



MORE INFORMATION
With this hotfix installed, the dots in the URL are counted. If the number of dots exceeds the default value of 100, you receive an error message. You can also configure this value through the registry. To do this, follow these steps:  Start Registry Editor. Locate the following key in the registry:

 On the Edit menu, click Add Value, and then add the following registry value:

Value Name: MAXDEPTHDOTS

Data Type: REG_DWORD

Value: 100

 Quit Registry Editor.</li></ol>

For more information about this problem, visit the following Microsoft TechNet Web site:

http://www.microsoft.com/technet/security/bulletin/ms00-030.mspx

For more information about security and Microsoft products, visit the following Microsoft TechNet Web site:

http://www.microsoft.com/technet/security/default.mspx

For more information about how to install Windows 2000 and Windows 2000 fixes at the same time, click the following article number to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 hotfixes

Additional query words: security_patch

Keywords: kbdownload kbbug kbfix kbwin2000sp1fix kbgraphxlinkcritical kbqfe kbsecurity kbhotfixserver KB260205

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