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Patch for "HyperTerminal Buffer Overflow" Vulnerability In Windows NT 4.0 (Q304158)

The information in this article applies to:

  • Microsoft Windows NT Server versions 4.0 , 4.0 SP1 , 4.0 SP2 , 4.0 SP3 , 4.0 SP4 , 4.0 SP5 , 4.0 SP6a
  • Microsoft Windows NT Server, Enterprise Edition versions 4.0 , 4.0 SP4 , 4.0 SP5 , 4.0 SP6a
  • Microsoft Windows NT Workstation versions 4.0 , 4.0 SP1 , 4.0 SP2 , 4.0 SP3 , 4.0 SP4 , 4.0 SP5 , 4.0 SP6a

For additional information about a similar problem that can occur in Microsoft Windows 2000, click the article number below to view the article in the Microsoft Knowledge Base:
Q276471 Patch for "HyperTerminal Buffer Overflow" Vulnerability In Windows 2000


Microsoft has released a patch to address a potential security vulnerability in the HyperTerminal program that is included with Windows NT 4.0. A buffer-overflow vulnerability could allow arbitrary code to be run on a user's computer under special circumstances.


A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems that are determined to be at risk of attack. Please evaluate your computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to your computer. Please see the associated Microsoft Security Bulletin to help make this determination. This fix may receive additional testing at a later time, to further ensure product quality. If your computer is sufficiently at risk, Microsoft recommends that you apply this fix now.

To resolve this problem immediately, download the fix as instructed below or contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:
NOTE : In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The following file is available for download from the Microsoft Download Center:
] Download Q304158i.exe now
Release Date: August 29, 2001

For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:
Q119591 How to Obtain Microsoft Support Files from Online Services
Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed 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   Version        Size     File name
   26-Jul-2001  18:05  4.0.1381.7097   22,288  Hticons.dll
   26-Jul-2001  18:05          8,976  Htrn_jis.dll
   26-Jul-2001  18:05  4.0.1381.7097  386,320  Hypertrm.dll
   26-Jul-2001  18:06  4.0.1381.7097    6,928  Hypertrm.exe
NOTE : Because of file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 6a.


Microsoft has confirmed that this problem could result in some degree of security vulnerability in Windows NT 4.0.


For additional information about this vulnerability, see the following Microsoft Web site:

Published Sep 4 2001 10:00AM Issue Type kbbug
Last Modifed Sep 4 2001 10:00AM Additional Query Words Security_Patch
Keywords kbWinNT400PreSP7Fix


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