Q283001: MS01-009: Patch Available for Malformed PPTP Packet Stream Vulne
Article: Q283001
Product(s): Microsoft Windows NT
Version(s): 4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Operating System(s):
Keyword(s): kbenv kbpatch kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability Kb
Last Modified: 08-MAY-2002
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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 Server versions 4.0, 4.0 SP4, 4.0 SP5, 4.0 SP6, Terminal Server Edition
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SYMPTOMS
========
Microsoft has released a patch that eliminates a security vulnerability that
affects Windows NT 4.0-based servers that provide secure remote sessions. The
vulnerability may allow a malicious user to prevent an affected computer from
providing service.
The Point-to-Point Tunneling Protocol (PPTP) service has a security vulnerability
in the code that handles a certain type of data packet, which results in a leak
of kernel memory. If a sufficient number of packets that contain a specific
malformation are received by an affected server, kernel memory eventually
becomes exhausted. This can cause the server to stop responding (hang). When the
computer hangs, you must reboot the computer. Note that any PPTP sessions that
are running are lost when you reboot the computer. The malicious user does not
need to establish a valid PPTP session to exploit the vulnerability.
The vulnerability does not threaten the security of the data in PPTP sessions in
any way; it is strictly a denial-of-service vulnerability. Computers that are
running the PPTP service are the only computers that are affected by this
vulnerability (the service does not run by default). Windows 2000-based
computers, including Windows 2000-based computers that are running PPTP, are not
affected by this vulnerability.
RESOLUTION
==========
Windows NT 4.0
--------------
To resolve this problem, obtain the individual package referenced below or obtain
the Windows NT 4.0 Security Rollup Package. For additional information on the
SRP, click the article number below to view the article in the Microsoft
Knowledge Base:
Q299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)
The following files are available for download from the Microsoft Download
Center:
US English:
DownloadDownload Q283001i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27836)
German:
DownloadDownload Deuq283001i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27844)
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. After it is posted, the file is housed on
secure servers that prevent any unauthorized changes to the file.
The English-language version of this fix should have the following file
attributes or later:
Date Time Version Size File name Platform
-----------------------------------------------------------------
12/07/2000 11:48p 4.0.1381.7086 41,008 Raspptpe.sys Intel
12/07/2000 11:46p 4.0.1381.7086 76,592 Raspptpe.sys Alpha
NOTE: Due to file dependencies, this hotfix requires Microsoft Windows NT 4.0
Service Pack 6a (SP6a).
Windows NT Server 4.0, Terminal Server Edition
----------------------------------------------
To resolve this problem, either obtain the hotfix referenced in this section or
the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package
(SRP). For additional information about the SRP, click the article number below
to view the article in the Microsoft Knowledge Base:
Q317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup
Package
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
(http://www.microsoft.com/technet/security/bulletin/ms01-009.asp) 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/default.aspx?scid=fh;EN-US;CNTACTMS
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 English-language version of this fix should have the following file
attributes or later:
Date Time Version Size File name Platform
-----------------------------------------------------------------
12/07/2000 11:48p 4.0.1381.7086 41,008 Raspptpe.sys Intel
12/07/2000 11:46p 4.0.1381.7086 76,592 Raspptpe.sys Alpha
NOTE: Due to file dependencies, this hotfix requires Microsoft Windows NT Server
4.0, Terminal Server Edition Service Pack 6 (SP6).
STATUS
======
Windows NT 4.0
--------------
Microsoft has confirmed that this problem could result in some degree of security
vulnerability in Windows NT 4.0.
Windows NT Server 4.0, Terminal Services Edition
------------------------------------------------
Microsoft has confirmed that this problem could result in some degree of security
vulnerability in Windows NT Server 4.0, Terminal Server Edition.
MORE INFORMATION
================
For more information about this vulnerability, view the following Microsoft Web
site:
http://www.microsoft.com/technet/security/bulletin/ms01-009.asp
Additional query words: security_patch kbtse srp
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Keywords : kbenv kbpatch kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin
Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp5 kbWinNTSEnt400sp4 kbWinNTSEnt400 kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServ400sp5 kbNTTermServ400sp6 kbNTTermServSearch kbWinNTSEnt400SP6a
Version : :4.0,4.0 SP1,4.0 SP2,4.0 SP3,4.0 SP4,4.0 SP5,4.0 SP6,4.0 SP6a
Hardware : ALPHA x86
Issue type : kbbug
Solution Type : kbfix
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