Invalid ICMP Datagram Fragments Hang Windows NT, Windows 95

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Article ID: 154174 - View products that this article applies to.
This article was previously published under Q154174
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Symptoms

Computers running Windows NT or Windows 95 may stop responding (hang) when they receive corrupted Internet Control Message Protocol (ICMP) datagram fragments from a client.

Resolution

Microsoft has updated the TCP/IP protocol stack to correct this problem. Instructions for installing it are available from Microsoft support channels or directly from the Internet locations below.

NOTE: This hotfix was originally posted on July 7, 1997. A subsequent fix was completed on January 9, 1998 to address another nearly identical attack and this hotfix has replaced the original one. The original hotfix is included in Windows NT 4.0 Service Pack 3. The most recent hotfix is not; however, it is available from the following Internet locations:

Windows NT 4.0

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For your convenience, the English version of this post-SP3 hotfix has been posted to the following Internet location. However, Microsoft recommends that you install Windows NT 4.0 Service Pack 4 to correct this problem.
ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/hotfixes-postSP3/teardrop2-fix
NOTE: Service Pack 3 must be applied to Windows NT 4.0 prior to applying this fix.

Windows NT 3.51

NOTE: Service Pack 5 must be applied to Windows NT 3.51 prior to applying this fix.

This fix should have the following time stamp:
   01/14/98  12:04p               123,824 Tcpip.sys   (Intel)
   01/14/98  12:00p               216,848 Tcpip.sys   (Alpha)
				
This hotfix has been posted to the following Internet location:
ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT351/hotfixes-postSP5/teardrop2-fix

Windows 95

This issue is resolved by the following updated file for Windows 95 and OSR2, and later versions of this file:
   Vip.386  version 4.0.958  dated 1/14/98 9:58am  66,734 bytes
				
This file is included in the self-extracting Vipup11.exe file.

The following file is available for download from the Microsoft Download Center:
Collapse this imageExpand this image
Download
Download Vipup11.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. The following files are installed by Vipup11.exe:
   File name  Version    Date/Time        Size     Destination folder
   ------------------------------------------------------------------
   Vip.386    4.00.958   1/14/98 9:58am   66,734   Windows\System
				

Status

Microsoft has confirmed this problem could result in some degree of security vulnerability in Windows NT version 4.0. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4. Microsoft has confirmed this problem could result in some degree of security vulnerability in Windows NT version 3.51. A fully supported fix is now available, but it has not been fully regression tested and should only be applied to systems determined to be at risk of attack. Please evaluate your system's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to your system. If your system is sufficiently at risk, Microsoft recommends you apply this fix. Otherwise, wait for the next Windows NT service pack, which will contain this fix. Please contact Microsoft Technical Support for more information. Microsoft has confirmed this to be a problem in Microsoft Windows 95 and OEM Service Release 2 (OSR2). An update to address this problem is now available, but is not fully regression tested and should be applied only to computers experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for additional information about the availability of this update.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Properties

Article ID: 154174 - Last Review: October 24, 2013 - Revision: 1.0
Applies to
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows 95
Keywords: 
kbnosurvey kbarchive kbhotfixserver kbqfe kbdownload kbbug kbfile kbfix kbgraphxlinkcritical kbnetwork KB154174

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