Article ID: 329834 - Last Review: December 1, 2007 - Revision: 5.5 MS02-063: Unchecked Buffer in PPTP Implementation May Permit Denial-of-Service AttacksThis article was previously published under Q329834 On This PageSYMPTOMS
Windows 2000 and Windows XP have built-in support for Point-to-Point Tunneling Protocol (PPTP). This is a virtual private network (VPN) technology that is implemented as part of Remote Access Services. PPTP support is an optional component in Microsoft Windows NT 4.0, Microsoft Windows 98, Microsoft Windows 98 Second Edition, and Microsoft Windows Millennium Edition (Me). There is a security vulnerability in the Windows 2000 and Windows XP implementations because of an unchecked buffer in a section of code that processes the control data that is used to establish, maintain, and remove PPTP connections. By delivering specially malformed PPTP control data to an affected server, an attacker might be able to corrupt kernel memory and cause the server to stop working, disrupting any work that is in progress on the server. The vulnerability might be exploited against any server that offers PPTP. If a workstation is configured to operate as a remote access server that offers PPTP services, it can also be attacked. Workstations that act as PPTP clients can be attacked only during active PPTP sessions. Typical operation on an attacked computer can be restored by restarting the computer. RESOLUTIONService pack informationWindows XPTo resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:322389
(http://support.microsoft.com/kb/322389/EN-US/
)
How to obtain the latest Windows XP service pack Windows 2000To 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
Hotfix informationWindows 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/MS02-063.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 files are available for download from the Microsoft Download Center:Windows XP Professional and Windows XP Home Edition
English (US): Windows XP 64-Bit EditionCollapse this image  Arabic: Collapse this image Chinese (Simplified): Collapse this image Chinese (Traditional): Collapse this image Czech: Collapse this image Danish: Collapse this image Dutch: Collapse this image Finnish: Collapse this image French: Collapse this image German: Collapse this image Greek: Collapse this image Hebrew: Collapse this image Hungarian: Collapse this image Italian: Collapse this image Japanese: Collapse this image Korean: Collapse this image Norwegian: Collapse this image Polish: Collapse this image Portuguese: Collapse this image Portuguese (Brazil): Collapse this image Russian: Collapse this image Spanish: Collapse this image Swedish: Collapse this image Turkish: Collapse this image
English (US):
Release Date: October 30, 2002Collapse this image French: Collapse this image German: Collapse this image Japanese: 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:
q329834_wxp_sp2_x86_enu /q /m /z 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 in the %Windir%\System32\Drivers folder: Windows XP Professional and Windows XP Home Edition Date Time Version Size File name ------------------------------------------------------------------ 01-Oct-2002 23:43 5.1.2600.101 46,208 Raspptp.sys (pre-SP1) 01-Oct-2002 22:52 5.1.2600.1129 46,208 Raspptp.sys (with SP1) Date Time Version Size File name ------------------------------------------------------------------- 01-Oct-2002 23:43 5.1.2600.101 165,888 Raspptp.sys (pre-SP1) 01-Oct-2002 22:52 5.1.2600.1128 166,528 Raspptp.sys (with SP1) Windows 2000A 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/MS02-063.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 files are available for download from the Microsoft Download Center: Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image 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 informationBecause of file dependencies, this update requires Windows 2000 Service Pack 1 (SP1), Windows 2000 Service Pack 2 (SP2), or Service Pack 3 (SP3). For additional information, click the article number below 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
You must restart your computer after you apply this update. This update supports the following Setup switches:
q329834_w2k_sp4_x86_en /q /m /z 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 file is installed in the %Windir%\System32\Drivers folder: Date Time Version Size File name ------------------------------------------------------ 01-Oct-2002 21:55 5.0.2195.6076 46,640 Raspptp.sys 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. This problem was first corrected in Microsoft Windows XP Service Pack 2.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.MORE INFORMATION
For more information about this vulnerability, visit the following Microsoft Web site:
http://www.microsoft.com/technet/security/bulletin/MS02-063.mspx
(http://www.microsoft.com/technet/security/bulletin/MS02-063.mspx)
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