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Denial-of-Service Attack with SFU 2.0


The information in this article applies to:
  • Microsoft Windows Services for UNIX, version 2.0
  • Microsoft Windows versions 2000, 2000 SP1, 2000 SP2 Professional
  • Microsoft Windows versions 2000, 2000 SP1, 2000 SP2 Server
  • Microsoft Windows versions 2000, 2000 SP1, 2000 SP2 Advanced Server


SYMPTOMS

The following Denial-of-Service vulnerabilities were discovered in Services for UNIX (SFU) 2.0:

  • Certain activities that are run against Port Mapper can cause Port Mapper to cause a blue-screen "Stop" error, or may cause a memory leak.


  • Using Telnet to access port 2049 (the NFS Server port) could cause a blue-screen "Stop" error.



CAUSE

The problem is caused by a logic error in the SFU implementation of the Sun RPC protocol.


RESOLUTION

Windows 2000

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:

http://support.microsoft.com/directory/overview.asp
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:
[GRAPHIC: Download]Download Q294380_SFU_2_x86.exe now
Release Date: July 24, 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 
   ----------------------------------------------------
   31-Mar-2001  1957  5.2000.328.14  36,800  Rpcxdr.sys 
NOTE: Due to file dependencies, this update requires Windows 2000 Service Pack 1 (SP1) or later.

Windows NT 4.0

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:

http://support.microsoft.com/directory/overview.asp
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:
[GRAPHIC: Download]Download Q294380_SFU_2_x86.exe now
Release Date: July 24, 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 
   ----------------------------------------------------
   31-Mar-2001  0757  5.2000.328.14  36,800  Rpcxdr.sys 
NOTE: Due to file dependencies, this update requires Windows NT 4.0 Service Pack 6a (SP6a).


STATUS

Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft Services for Unix 2.0.


MORE INFORMATION

For more information on this vulnerability, see the following Microsoft Web site:

http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/ms01-039.asp

Additional query words: security_patch

Keywords : kbenv kbtool
Issue type : kbbug
Technology : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWinAdvServSearch kbWin2000AdvServSP2 kbWin2000AdvServSP1 kbWin2000ProSP2 kbWin2000ProSP1 kbwin2000ServSP1 kbwin2000ServSP2 kbWinServiceUNIX200 kbWinServiceUNIXSearch


Last Reviewed: August 1, 2001
© 2001 Microsoft Corporation. All rights reserved. Terms of Use.


Article ID: Q294380

Last Reviewed:
August 1, 2001

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