Article ID: 326830 - Last Review: December 1, 2007 - Revision: 6.5 MS02-045: Unchecked Buffer in Network Share Provider May Lead to Denial-of-ServiceThis article was previously published under Q326830 On This PageSYMPTOMS
Server Message Block (SMB) is the protocol that Microsoft uses to share files, printers, and serial ports. SMB is also used to communicate between computers by using named pipes and mail slots. In a networked environment, servers make file systems and resources available to clients. Clients make SMB requests for resources, and servers make SMB responses in what is described as a client server, request-response protocol. By sending a specially-crafted packet request, an attacker can mount a denial-of-service attack on the target server computer. This may cause your computer to stop responding (hang). The attacker could use both a user account and anonymous access to accomplish this. Though not confirmed, it may be possible to start arbitrary code. RESOLUTIONWindows XPA 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 you determine are at risk of attack. Evaluate your computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to your computer. See the associated Microsoft Security Bulletin (http://www.microsoft.com/technet/security/bulletin/MS02-045.mspx) to help determine the degree of risk. This fix may receive additional testing. If your computer is sufficiently at risk, Microsoft recommends that you apply this fix now. Otherwise, wait for the next Windows XP service pack that contains this fix.To resolve this problem immediately, download the fix by following the instructions later in this article or 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
(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.Download InformationThe following file is available for download from the Microsoft Download Center:
Windows XP Professional:
Release Date: August 22, 2002Collapse this image  Windows XP 64-bit Edition: Collapse this image 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
(http://support.microsoft.com/kb/119591/EN-US/
)
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.
Installation InformationYou must restart your computer after you apply this update. This update supports the following Setup switches:
WARNING: Your computer is vulnerable until you restart it. File InformationThe English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.The following files are installed to the %WINDIR%\System32 folder. Date Time Version Size File name Platform -------------------------------------------------------------------- 25-Jul-2002 22:15 5.1.2600.50 86,016 Xactsrv.dll WinXP Pro 25-Jul-2002 15:27 5.1.2600.50 86,016 Wxactsrv.dll WinXP 64-bit 25-Jul-2002 22:15 5.1.2600.50 290,304 Xactsrv.dll WinXP 64-bit Windows 2000 Service Pack InformationTo resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:260910
(http://support.microsoft.com/kb/260910/EN-US/
)
How to Obtain the Latest Windows 2000 Service Pack
Windows 2000 Hotfix InformationA 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 you determine are at risk of attack. Evaluate your computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to your computer. See the associated Microsoft Security Bulletin (http://www.microsoft.com/technet/security/bulletin/MS02-045.mspx) to help determine the degree of risk. This fix may receive additional testing. If your computer is sufficiently at risk, Microsoft recommends that you apply this fix now. Otherwise, wait for the next Windows 2000 service pack that contains this fix.To resolve this problem immediately, download the fix by following the instructions later in this article or 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
(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.Download InformationThe following file is available for download from the Microsoft Download Center:Collapse this image 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
(http://support.microsoft.com/kb/119591/EN-US/
)
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.
Installation InformationYou must restart your computer after you apply this update. This update supports the following Setup switches:
WARNING: Your computer is vulnerable until you restart it. File InformationThe English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.Date Time Version Size Path and File name ------------------------------------------------------------------------ 23-Jul-2002 20:28 5.0.2195.5971 92,432 %WINDIR%\System32\Xactsrv.dll 260910
(http://support.microsoft.com/kb/260910/EN-US/
)
How to Obtain the Latest Windows 2000 Service Pack
Windows NT 4.0 and Windows NT Server 4.0, Terminal Server EditionA supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that you determine are at risk of attack. Evaluate the computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to the computer. See the associated Microsoft Security Bulletin (http://www.microsoft.com/technet/security/bulletin/MS02-045.mspx) to help determine the degree of risk. This hotfix may receive additional testing. If the computer is sufficiently at risk, we recommend that you apply this hotfix now.To resolve this problem immediately, download the hotfix by following the instructions later in this article or contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site: http://support.microsoft.com/contactus/?ws=support
(http://support.microsoft.com/contactus/?ws=support)
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. Download InformationThe following file is available for download from the Microsoft Download Center:
Windows NT 4.0:
Release Date: August 22, 2002Collapse this image Windows NT Server 4.0, Terminal Server Edition: Collapse this image 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
(http://support.microsoft.com/kb/119591/EN-US/
)
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.
Installation Information
WARNING: Your computer is vulnerable until you restart it. File InformationThe English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.The following files are installed to the %WINDIR%\System32 folder. Date Time Version Size File name Platform ------------------------------------------------------------------- 24-Jul-2002 15:28 4.0.1381.7181 101,648 Xactsrv.dll WinNT 4.0 24-Jul-2002 15:38 4.0.1381.33538 101,648 Xactsrv.dll TSE 152734
(http://support.microsoft.com/kb/152734/EN-US/
)
How to Obtain the Latest Windows NT 4.0 Service Pack
STATUSWindows XPMicrosoft has confirmed that this problem may cause a degree of security vulnerability in the Microsoft products that are listed at the beginning of this article.Windows 2000Microsoft has confirmed that this problem may cause a degree of security vulnerability in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.Windows NT 4.0 and Windows NT Server 4.0, Terminal Server EditionMicrosoft has confirmed that this problem may cause a degree of security vulnerability in the Microsoft products that are listed at the beginning of this article.MORE INFORMATION
For more information about this vulnerability, see the following Microsoft Web site:
http://www.microsoft.com/technet/security/bulletin/MS02-045.mspx
(http://www.microsoft.com/technet/security/bulletin/MS02-045.mspx)
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