Q252693: Chunked Encoding Request with No Data Causes IIS Memory Leak
Article: Q252693
Product(s): Internet Information Server
Version(s): 4.0
Operating System(s):
Keyword(s): kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical
Last Modified: 08-MAY-2002
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The information in this article applies to:
- Microsoft Internet Information Server version 4.0
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SYMPTOMS
========
A repetitive attack using a specially malformed request may cause Internet
Information Server (IIS) to use a large amount of memory, and eventually cause
the service to fail. This problem can occur when the client uses the
Transfer-Encoding: chunked header in its request.
RESOLUTION
==========
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 experiencing this specific problem.
To resolve this problem, 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 following files are available for download from the Microsoft Download
Center:
US English:
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19761)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19762)
Chinese (Simplified):
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19879)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19879)
Chinese (Traditional):
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19880)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19880)
Dutch:
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27728)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27728)
French:
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27730)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27730)
German:
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19881)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19881)
Japanese:
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19882)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19882)
Korean:
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19883)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19883)
Portuguese (Brazil):
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27729)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27729)
Spanish:
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27731)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27731)
Swedish:
x86: DownloadDownload Chkenc4i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27732)
Alpha: DownloadDownload Chkenc4a.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=27732)
NOTE: Debug symbol files are required by an administrator to do both kernel
and user mode debugging, providing a method to resolve global variables and
function names in the loaded executable file. Click the file names below to
download the symbol files:
US English:
x86: DownloadDownload Chkenc4is.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19761)
Alpha: DownloadDownload Chkenc4as.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19762)
Chinese (Simplified):
x86: DownloadDownload Chkenc4is.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19879)
Alpha: DownloadDownload Chkenc4as.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19879)
Chinese (Traditional):
x86: DownloadDownload Chkenc4is.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19880)
Alpha: DownloadDownload Chkenc4as.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19880)
German:
x86: DownloadDownload Chkenc4is.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19881)
Alpha: DownloadDownload Chkenc4as.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19881)
Japanese:
x86: DownloadDownload Chkenc4is.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19882)
Alpha: DownloadDownload Chkenc4as.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19882)
Korean:
x86: DownloadDownload Chkenc4is.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19883)
Alpha: DownloadDownload Chkenc4as.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19883)
The English version of this fix should have the following file attributes or
later:
Date Time Version Size File name Platform
----------------------------------------------------------------------
1/28/2000 02:32:16p 4.2.739.1 185,760b Infocomm.dll x86
1/28/2000 02:33:10p 4.2.739.1 38,256b Ssinc.dll x86
1/28/2000 02:33:18p 4.2.739.1 25,360b Sspifilt.dll x86
1/28/2000 02:32:58p 4.2.739.1 228,480b W3svc.dll x86
1/28/2000 05:32:05p 4.2.739.1 304,400b Infocomm.dll Alpha
1/28/2000 05:53:00p 4.2.739.1 60,176b Ssinc.dll Alpha
1/28/2000 05:53:07p 4.2.739.1 39,696b Sspifilt.dll Alpha
1/28/2000 05:32:49p 4.2.739.1 383,760b W3svc.dll Alpha
Microsoft Windows NT Server version 4.0, Terminal Server Edition
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To resolve this problem, obtain 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
STATUS
======
Microsoft has confirmed this to be a problem in Internet Information Server 4.0.
Additional query words: security_patch tsesrp
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Keywords : kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical
Technology : kbiisSearch kbiis400
Version : :4.0
Hardware : ALPHA x86
Issue type : kbbug
Solution Type : kbfix
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