Q288855: MS01-026: FTP Service Allows Login to Domain Guest Account
Article: Q288855
Product(s): Internet Information Server
Version(s): 4.0,5.0
Operating System(s):
Keyword(s): kbSecurity kbCOMIS kbWinNT400PreSP7Fix kbWin2000PreSP3Fix kbgraphxlinkcritical KbSECVul
Last Modified: 15-AUG-2002
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The information in this article applies to:
- Microsoft Internet Information Services version 5.0
- Microsoft Internet Information Server version 4.0
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SYMPTOMS
========
In Microsoft Internet Information Services (IIS) 5.0 and Microsoft Internet
Information Server (IIS) 4.0, if a user wants to log onto an FTP server by using
a domain user account, rather than a local one, they are required to precede it
with the name of the domain. However, if the user precedes an account name with
a particular set of characters, a flaw causes the FTP service to search the
domain and all trusted domains for the user account. If the user enters the
correct password for the account, they are logged into it.
Mitigating Factors:
- This vulnerability can only be exploited if the FTP server is a domain
member. However, this is usually not appropriate for Internet-connected FTP
servers.
- This vulnerability can only be exploited if the Guest account on the local
computer has been disabled, and the Guest account on a trusted domain is
enabled. By default, the Guest account is disabled in Windows NT Server 4.0
and Windows 2000.
CAUSE
=====
If a user ID is specified in a particular way when a user logs onto an affected
FTP server, the system automatically searches all trusted domains for a user ID
that matches it. If the user ID is found and the correct password is provided,
the system will allow the user to log into it normally.
RESOLUTION
==========
For additional information on what is fixed by these patches, click the article
number below to view the article in the Microsoft Knowledge Base:
Q297860 IIS 5.0 Security and Post-Windows NT 4.0 SP5 IIS 4.0 Patch Rollup
Internet Information Services 5.0
---------------------------------
To resolve this problem, either obtain the hotfix referenced in this section or
Windows 2000 Security Rollup Package 1 (SRP1). For additional information about
SRP1, click the article number below to view the article in the Microsoft
Knowledge Base:
Q311401 Windows 2000 Security Rollup Package 1 (SRP1), January 2002
To resolve this problem, obtain the latest service pack for Windows 2000. For
additional information, click the following article number to view the article
in the Microsoft Knowledge Base:
Q260910 How to Obtain the Latest Windows 2000 Service Pack
The following file is available for download from the Microsoft Download Center:
DownloadDownload Q293826_W2K_SP3_x86_en.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=29764)
For additional information about how to download Microsoft Support files, click
the following article number to view the article in the Microsoft Knowledge
Base:
Q119591 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 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
--------------------------------------------------------
05/04/2001 11:48a 5.0.2195.3554 245,520 Adsiis.dll
05/04/2001 11:48a 5.0.2195.3554 332,560 Asp.dll
08/26/2000 06:30p 6,512 Fixerr.js
11/10/2000 11:21p 4.0.2.4701 593,976 Fp4autl.dll
03/27/2001 10:10p 0.9.3940.21 445,712 Httpext.dll
05/04/2001 11:48a 5.0.2195.3554 56,592 Httpodbc.dll
05/04/2001 11:48a 5.0.2195.3554 122,640 Iisrtl.dll
05/04/2001 11:48a 5.0.2195.3554 13,584 Infoadmn.dll
05/04/2001 11:48a 5.0.2195.3554 245,520 Infocomm.dll
05/04/2001 11:48a 5.0.2195.3554 62,736 Isatq.dll
05/04/2001 11:48a 5.0.2195.3554 46,352 Ism.dll
05/04/2001 11:48a 5.0.2195.3555 76,560 Msw3prt.dll
10/17/2000 01:38p 5.0.2195.2507 6,928 Schmupd.exe
05/04/2001 11:48a 5.0.2195.3554 41,232 Ssinc.dll
05/04/2001 11:48a 5.0.2195.3554 7,440 W3ctrs.dll
05/04/2001 11:48a 5.0.2195.3554 357,648 W3svc.dll
NOTE: This patch can be installed on systems running Windows 2000 Gold, Windows
2000 Service Pack 1, or Windows 2000 Service Pack 2.
Internet Information Server 4.0
-------------------------------
A 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/ms01-026.asp) 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.
To resolve this problem immediately, download the fix by clicking the download
link 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, please visit the following
Microsoft Web site:
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.
The following file is available for download from the Microsoft Download Center:
DownloadDownload Q295534i.exe now
(http://www.microsoft.com/Downloads/Release.asp?ReleaseID=29787)
NOTE: Q295534is.exe contains the Symbols files.
For additional information about how to download Microsoft Support files, click
the following article number to view the article in the Microsoft Knowledge
Base:
Q119591 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 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
--------------------------------------------------------
04/11/2001 01:32p 4.2.764.1 214,544 Adsiis.dll
04/11/2001 01:33p 4.2.764.1 330,672 Asp.dll
04/02/2001 04:55p 4.0.2.4701 593,976 Fp4autl.dll
04/11/2001 01:32p 4.2.764.1 81,888 Ftpsvc2.dll
04/11/2001 01:32p 4.2.764.1 55,392 Httpodbc.dll
04/11/2001 01:32p 4.2.764.1 98,912 Iischema.dll
04/11/2001 01:31p 4.2.764.1 63,472 Iislog.dll
04/11/2001 01:31p 4.2.764.1 185,792 Infocomm.dll
04/11/2001 01:31p 4.2.764.1 29,520 Iscomlog.dll
04/11/2001 01:35p 4.2.764.1 54,560 Ism.dll
04/02/2001 04:55p 4.0.1381.7086 375,056 Kernel32.dll
04/11/2001 01:36p 4.2.764.1 9,680 Schmupd.exe
04/11/2001 01:32p 4.2.764.1 38,256 Ssinc.dll
04/11/2001 01:32p 4.2.764.1 25,360 Sspifilt.dll
04/11/2001 01:32p 4.2.764.1 229,024 W3svc.dll
04/11/2001 01:31p 4.2.764.1 88,032 Wam.dll
NOTE: This patch can be installed on systems running Windows NT 4.0 Service Pack
5 or Windows NT 4.0 Service Pack 6a.
STATUS
======
Microsoft has confirmed that this problem may cause a degree of security
vulnerability in Internet Information Services 5.0 and Internet Information
Server 4.0. This problem was first corrected in Windows 2000 Service Pack 3.
MORE INFORMATION
================
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 more information on this vulnerability, see the following Microsoft Web
site:
http://www.microsoft.com/technet/security/bulletin/ms01-026.asp
Additional query words: kbIISCom security_patch kbWin2000srp1
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Keywords : kbSecurity kbCOMIS kbWinNT400PreSP7Fix kbWin2000PreSP3Fix kbgraphxlinkcritical KbSECVulnerability KbSECHack kbWin2000sp3fix
Technology : kbiisSearch kbiis500 kbiis400
Version : :4.0,5.0
Hardware : x86
Issue type : kbbug
Solution Type : kbfix
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