MS00-029: Windows Hangs with Fragmented IP Datagrams (259728)


The information in this article applies to:

  • Microsoft Windows NT Server 4.0 Terminal Server Edition
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional
  • Microsoft Windows NT Server 4.0
  • Microsoft Windows NT Server, Enterprise Edition 4.0
  • Microsoft Windows NT Workstation 4.0
  • Microsoft Windows 95
  • Microsoft Windows 98
This article was previously published under Q259728

SYMPTOMS

Windows may become sluggish, or may stop responding (hang). You may also notice that the System process is consuming most or all of the CPU resources.

CAUSE

If IP fragments having a particular malformation are sent to a Windows NT 4.0 or Windows 2000 computer in a continuous stream at a relatively low data rate, an implementation flaw will cause the computer to devote most or all of its CPU availability to processing the incoming fragments.

RESOLUTION

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

The following file is available for download from the Microsoft Download Center:

DownloadDownload Q259728_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.

Windows NT 4.0

To resolve this problem, obtain the individual package referenced below or obtain the Windows NT 4.0 Security Rollup Package. For additional information on the SRP, click the article number below to view the article in the Microsoft Knowledge Base:

299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)

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

x86: DownloadDownload Q259728i.exe now

Alpha: DownloadDownload Q259728a.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  Platform
   ------------------------------------------------
   04/27/2000  03:51p  174,512  Tcpip.sys  x86
   04/27/2000  03:50p  310,864  Tcpip.sys  Alpha

Windows NT Server 4.0, Terminal Server Edition

To resolve this problem, either obtain the hotfix referenced in this section or 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

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

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: DownloadDownload Q259728i.exe now

Alpha: DownloadDownload Q259728a.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  Platform
   ------------------------------------------------
   04/27/2000  05:47p  173,008  Tcpip.sys  x86
   04/27/2000  05:35p  308,592  Tcpip.sys  Alpha

Windows 98

This critical update is available as Security Update, May 19, 2000 from the following Microsoft web site:

http://www.microsoft.com/Windows98/downloads/contents/WUCritical/q259728/Default.asp

Windows 95

This critical update is available as Security Update, May 19, 2000 from the following Microsoft web site:

http://www.microsoft.com/windows95/downloads/contents/WUCritical/q259728/Default.asp

STATUS

Windows 2000

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Windows 2000. This problem was first corrected in Windows 2000 Service Pack 1.

Windows NT 4.0

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Windows NT 4.0.

Windows 98

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Windows 98.

Windows 95

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Windows 95.

MORE INFORMATION

For related information about this problem, please visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/bulletin/ms00-029.mspx

For additional security-related information about Microsoft products, please visit the following Microsoft Web site:

http://www.microsoft.com/security/

Modification Type:MajorLast Reviewed:10/10/2006
Keywords:kbHotfixServer kbQFE kbbug kbfix kbgraphxlinkcritical kbQFE KbSECBulletin KbSECHack kbSecurity KbSECVulnerability kbWin2000sp1Fix KB259728
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