MS00-023: 100% CPU Usage Occurs When You Send a Large Escape Sequence

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Article ID: 254142
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Symptoms

When you send a large escape sequence to a computer running Internet Information Server 4.0 or Internet Information Services 5.0, the computer may use 100 percent CPU while it is processing the request. During this time, the server may not respond to other requests.

Cause

This problem occurs because the Str::unescape function parses the escape characters in the request string by processing one character at a time, shifting the data over each time, and then starting again from the beginning of the request string. This takes a considerable amount of CPU usage, and can cause the server to stop processing other requests.

Resolution

Internet Information Services 5.0 (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
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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
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Microsoft Windows NT Server version 4.0, Terminal Server Edition

To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package (SRP). For additional information about the SRP, click the article number below to view the article in the Microsoft Knowledge Base:
317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package

Status

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.

More information

When you install this fix, the Str::unescape function traverses the request string only one time.

For additional information, please see the Microsoft Security Bulletin at the following Microsoft Web site:
http://www.microsoft.com/technet/security/Bulletin/MS00-023.mspx

Properties

Article ID: 254142 - Last Review: September 24, 2012 - Revision: 7.0
Keywords: 
kbhotfixserver kbqfe kbbug kbfix kbgraphxlinkcritical kbsecurity kbwin2000sp1fix KB254142

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