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Malformed RPC Request Can Cause Service Problems


The information in this article applies to:
  • 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
  • Microsoft Exchange Server, versions 5.5, 5.5 SP1, 5.5 SP2, 5.5 SP3, 5.5 SP4
  • Microsoft Exchange 2000 Server SP1
  • 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 Workstation 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 versions 4.0, 4.0 SP4, 4.0 SP5, 4.0 SP6, Terminal Server Edition
  • Microsoft Exchange 2000 Enterprise Server
  • Microsoft SQL Server versions 7.0, 7.0 Service Pack 1, 7.0 Service Pack 2
  • Microsoft SQL Server 2000 (all editions)


SYMPTOMS

A denial-of-service vulnerability exists in the Microsoft products that are listed at the beginning of this article. This vulnerability can disrupt a server's ability to service legitimate users' requests if a specially malformed request is received.

The results of exploiting this vulnerability could vary, depending on the particular request and to which of the affected services the attacker could send the request. If best practices have been followed, an attacker on the Internet would be unable to send such a request to any of the affected services.


CAUSE

This vulnerability exists because the Remote Procedure Call (RPC) server stubs that are associated with certain services in the affected products do not correctly validate incoming requests before passing them to the associated service. This could enable a request to be passed to a service that would cause problems with the service.


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. Otherwise, wait for the next Windows 2000 service pack that contains this fix.

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 Q298012_w2k_sp3_x86_en.exe now
Release Date: July 26, 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
   -------------------------------------------------------------
   17-May-2001  02:33  2000.2.3479.0      166,160  Catsrv.dll
   28-Jun-2001  17:31  2000.2.3479.0      575,760  Catsrvut.dll
   17-May-2001  02:33  2000.2.3479.0       96,016  Clbcatex.dll
   17-May-2001  02:33  2000.2.3479.0      508,688  Clbcatq.dll
   17-May-2001  02:33  2000.2.3479.0       37,648  Colbact.dll
   17-May-2001  02:33  2000.2.3479.0      201,488  Comadmin.dll
   28-Jun-2001  17:31  2000.2.3479.0    1,417,488  Comsvcs.dll
   17-May-2001  02:33  2000.2.3479.0      625,936  Comuid.dll
   28-Jun-2001  17:31  5.131.2195.3789    442,640  Cryptui.dll
   21-Jun-2001  00:31  5.131.2195.3759    270,608  Dhcpssvc.dll
   04-May-2001  17:00                       9,679  Dtcsetup.cat
   04-May-2001  17:00  2000.2.3479.0      822,600  Dtcsetup.exe
   17-May-2001  02:33  2000.2.3479.0      234,256  Es.dll
   09-Jul-2001  18:38  5.0.2195.3831       48,912  Llsrpc.dll
   09-Jul-2001  13:40  5.0.2195.3831       82,192  Llssrv.exe
   17-May-2001  02:33  5.0.0.720          278,800  Mq1repl.dll
   28-Feb-2001  18:47  5.0.0.720           14,096  Mq1sync.exe
   29-May-2001  15:22  5.0.0.735           71,120  Mqac.sys
   17-May-2001  02:33  5.0.0.721          214,288  Mqads.dll
   28-Feb-2001  18:47  5.0.0.720           21,776  Mqbkup.exe
   17-May-2001  02:33  5.0.0.720           29,456  Mqcertui.dll
   17-May-2001  02:33  5.0.0.720           49,424  Mqclus.dll
   17-May-2001  02:33  5.0.0.720           29,968  Mqdbodbc.dll
   17-May-2001  02:33  5.0.0.720           75,536  Mqdscli.dll
   17-May-2001  02:33  5.0.0.720           41,744  Mqdssrv.dll
   28-Feb-2001  18:47  5.0.0.720           98,064  Mqmig.exe
   17-May-2001  02:33  5.0.0.720          263,952  Mqmigrat.dll
   17-May-2001  02:33  5.0.0.720          223,504  Mqoa.dll
   17-May-2001  02:33  5.0.0.720            7,952  Mqperf.dll
   30-May-2001  17:16  5.0.0.720          414,992  Mqqm.dll
   17-May-2001  02:33  5.0.0.720            8,464  Mqrperf.dll
   30-May-2001  17:16  5.0.0.720           91,920  Mqrt.dll
   17-May-2001  02:33  5.0.0.720           70,416  Mqsec.dll
   17-May-2001  02:33  5.0.0.720          400,144  Mqsnap.dll
   28-Feb-2001  18:48  5.0.0.720           14,096  Mqsvc.exe
   17-May-2001  02:33  5.0.0.720           24,336  Mqupgrd.dll
   17-May-2001  02:33  5.0.0.720          107,792  Mqutil.dll
   28-Jun-2001  17:31  2000.2.3479.0      681,744  Msdtcprx.dll
   28-Jun-2001  17:31  2000.2.3479.0    1,121,040  Msdtctm.dll
   17-May-2001  02:33  2000.2.3479.0      145,680  Msdtcui.dll
   17-May-2001  02:33  5.0.0.720           64,784  Msmq.cpl
   17-May-2001  02:33  5.0.0.720          159,504  Msmqocm.dll
   04-May-2001  17:04  2000.2.3479.0      151,312  Mtstocom.exe
   17-May-2001  02:33  2000.2.3479.0       52,496  Mtxclu.dll
   17-May-2001  02:33  2000.2.3479.0       23,824  Mtxdm.dll
   28-Jun-2001  17:31  2000.2.3479.0      104,208  Mtxoci.dll
   02-Jun-2001  12:23  5.0.2195.3669       17,168  Nddeapi.dll
   30-May-2001  16:31  5.0.2195.3655        4,880  Nddeapir.exe
   02-Jun-2001  12:22  5.0.2195.3669      108,816  Netdde.exe
   04-May-2001  12:05  5.0.2195.2951    1,684,928  Ntkrnlmp.exe
   04-May-2001  12:05  5.0.2195.2951    1,684,672  Ntkrnlpa.exe
   04-May-2001  12:05  5.0.2195.2951    1,705,280  Ntkrpamp.exe
   13-Jun-2001  11:13  5.0.2195.3728        6,928  Ntlsapi.dll
   04-May-2001  12:05  5.0.2195.2951    1,713,232  Ntoskrnl.exe
   17-May-2001  02:33  5.0.2195.3506      138,000  Nwprovau.dll
   17-May-2001  02:33  5.0.2195.3448       60,688  Nwwks.dll
   09-Jul-2001  18:38  5.0.2195.3761      940,304  Ole32.dll
   04-May-2001  12:05  5.0.2195.2780       56,080  Rasman.dll
   04-May-2001  12:05  5.0.2195.2728      150,800  Rasmans.dll
   04-May-2001  12:05  5.0.2195.2671       54,032  Rastapi.dll
   09-Jul-2001  18:38  5.0.2195.3831      427,792  Rpcrt4.dll
   09-Jul-2001  18:38  5.0.2195.3761      185,104  Rpcss.dll
   04-May-2001  12:05  5.0.2195.2896       94,320  Sfc.dll
   17-May-2001  02:33  5.0.2195.3555       62,736  Spoolss.dll
   30-Apr-2001  19:46  5.0.2195.3555       45,840  Spoolsv.exe
   04-May-2001  12:05  5.0.2195.2780      240,208  Srv.sys
   04-May-2001  12:05  5.0.2195.2904       81,168  Srvsvc.dll
   20-Dec-2000  11:43  5.0.2195.3091        3,856  Svcpack1.dll
   28-Jun-2001  17:31  5.0.2195.3753       53,520  Trksvr.dll
   28-Jun-2001  17:31  2000.2.3479.0      383,248  Txfaux.dll
   04-May-2001  12:05  5.0.2195.2780       97,552  Wkssvc.dll 
NOTE: You can install this package in Windows 2000 Service Pack 1 or Windows 2000 Service Pack 2.

Windows NT 4.0

To resolve this problem, obtain the Windows NT 4.0 Security Rollup Package. For additional information, 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)

SQL Server 2000

To resolve this problem, obtain the latest service pack for SQL Server 2000. For additional information, please see the following article in the Microsoft Knowledge Base:
Q290211 INF: How to Obtain the Latest SQL Server 2000 Service Pack
For your convenience, this individual fix is also available for downloading from the Microsoft Download Center:
[GRAPHIC: Download]Download Q298012_sql2000_x86_en.exe now
Release Date: July 26, 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
   -------------------------------------------------------
   20-Oct-2000  19:06  2000.80.213.0  28,727  Dbmsrpcn.dll
   20-Oct-2000  19:06  2000.80.213.0  32,823  Ssmsrp70.dll 

SQL Server 7.0

To resolve this problem, obtain the latest service pack for SQL Server 7.0. For additional information, please see the following article in the Microsoft Knowledge Base:
Q301511 INF: How to Obtain the Latest SQL Server 7.0 Service Pack
For your convenience, this individual fix is also available for downloading from the Microsoft Download Center:
[GRAPHIC: Download]Download Q298012_sql70sp2_x86_en.exe now
Release Date: July 26, 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
   ------------------------------------------------------
   20-Oct-2000  20:48  2000.10.20.0  28,944  Dbmsrpcn.dll
   20-Oct-2000  20:48  2000.10.20.0  33,040  Ssmsrp70.dll 

Exchange 2000 Server

To resolve this problem, obtain the latest service pack for Microsoft Exchange 2000 Server. For additional information, please see the following article in the Microsoft Knowledge Base:
Q301378 XGEN: How to Obtain the Latest Exchange 2000 Server Service Pack
For your convenience, an individual fix is also available for downloading from the Microsoft Download Center. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
Q304063 XGEN: Exchange 2000 Server Post-RTM RPC Fixes

Exchange Server 5.5

For additional information about how to obtain this patch, click the article number below to view the article in the Microsoft Knowledge Base:
Q304062 XGEN: Exchange Server 5.5 Post-RTM SP-4 RPC Fixes


STATUS

Windows 2000

Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft Windows 2000.

Windows NT 4.0

Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft Windows NT 4.0.

SQL Server 2000

Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft SQL Server 2000. This problem was first corrected in Microsoft SQL Server 2000 Service Pack 1.

SQL Server 7.0

Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft SQL Server 7.0. This problem was first corrected in Microsoft SQL Server 7.0 Service Pack 3.

Exchange 2000 Server

Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft Exchange 2000 Server. This problem was first corrected in Microsoft Exchange 2000 Server Service Pack 1.

Exchange Server 5.5

Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft Exchange Server 5.5.


MORE INFORMATION

For additional information about this vulnerability, see the following Microsoft Web site:

http://www.microsoft.com/technet/security/bulletin/ms01-041.asp
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:
Q265173 The Datacenter Program and Windows 2000 Datacenter Server Product
For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:
Q296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot
For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:
Q249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Additional query words: security_patch

Keywords : kbWin2000PreSP3Fix kbSQLServ2000sp1fix kbExchange2000SP1Fix
Issue type : kbbug
Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400xsearch kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbWinNTW400sp5 kbWinNTW400sp4 kbWinNTW400sp3 kbWinNTW400sp2 kbWinNTW400sp1 kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp5 kbWinNTSEnt400sp4 kbWinNTSEnt400 kbWinNTS400sp6 kbWinNTS400sp5 kbWinNTS400sp4 kbWinNTS400sp3 kbWinNTS400sp2 kbWinNTS400sp1 kbWinNTS400xsearch kbWinNTS400 kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbNTTermServ400 kbNTTermServ400sp4 kbNTTermServ400sp5 kbNTTermServ400sp6 kbNTTermServSearch kbSQLServSearch kbAudDeveloper kbExchangeSearch kbExchange550 kbSQLServ700 kbSQLServ2000Search kbZNotKeyword2 kbExchange2000Search kbWinAdvServSearch kbWin2000AdvServSP2 kbWin2000AdvServSP1 kbWin2000ProSP2 kbWin2000ProSP1 kbwin2000ServSP1 kbwin2000ServSP2 kbWinNTSEnt400SP6a kbWinNTW400SP6a kbSQLServ700SP1 kbSQLServ700SP2 kbSQLServ2000 kbExchange2000Serv kbExchange2000EntServ kbExchange550SP1 kbExchange550SP2 kbExchange550SP3 kbExchange550SP4 kbExchange2000ServSP1


Last Reviewed: July 30, 2001
© 2001 Microsoft Corporation. All rights reserved. Terms of Use.


Article ID: Q298012

Last Reviewed:
July 30, 2001

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