MS02-018: Patch available for denial of service through FTP status request vulnerability

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Article ID: 317196 - View products that this article applies to.
This article was previously published under Q317196
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We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 7.0 running on Microsoft Windows Server 2008. IIS 7.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:
http://www.microsoft.com/technet/security/prodtech/IIS.mspx
For more information about IIS 7.0, visit the following Microsoft Web site:
http://www.iis.net/default.aspx?tabid=1
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SYMPTOMS

A denial of service vulnerability exists in Internet Information Server (IIS) 4.0, Internet Information Services (IIS) 5.0, and IIS 5.1. By exploiting this vulnerability, an attacker can temporarily prevent a Web server from providing Web services.

This vulnerability can only be exploited if the Web server is also configured to provide File Transfer Protocol (FTP) services. IIS 4.0 installs FTP services by default, but IIS 5.0 and 5.1 do not. The IIS Lockdown Tool disables FTP support by default.

This vulnerability does not allow any data on the system to be compromised, nor does it enable the attacker to gain any rights on the system.

CAUSE

This vulnerability results because the FTP implementation in IIS 4.0, 5.0, and 5.1 does not correctly handle a request for the status of the connection if the request has been malformed in a particular way. Receiving such a request results in the failure of the IIS service.

RESOLUTION

Internet Information Services 5.1

The update for this problem is included in the "MS02-018: April 2002 Cumulative Patch for Internet Information Services". For more information about how to obtain this patch, click the following article number to view the article in the Microsoft Knowledge Base:
319733 MS02-018: April 2002 cumulative patch for Internet Information Services

Internet Information Services 5.0

The update for this problem is included in the "MS02-018: April 2002 Cumulative Patch for Internet Information Services". For more information about how to obtain this patch, click the following article number to view the article in the Microsoft Knowledge Base:
319733 MS02-018: April 2002 cumulative patch for Internet Information Services

Internet Information Server 4.0

The update for this problem is included in the "MS02-018: April 2002 Cumulative Patch for Internet Information Services". For more information about how to obtain this patch, click the following article number to view the article in the Microsoft Knowledge Base:
319733 MS02-018: April 2002 cumulative patch for Internet Information Services

STATUS

Internet Information Services 5.1

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Services 5.1.

Internet Information Services 5.0

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Services 5.0.

Internet Information Server 4.0

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Server 4.0.

MORE INFORMATION

For more information on these vulnerabilities, see the following Microsoft Web site:
http://www.microsoft.com/technet/securit y/bulletin/MS02-018.mspx
For more information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base:
265173 Datacenter Program and Windows 2000 Datacenter Server Product
For more information about how to install multiple hotfixes with only one reboot, click the following article number to view the article in the Microsoft Knowledge Base:
296861 How to install multiple Windows updates or hotfixes with only one reboot
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 317196 - Last Review: February 27, 2014 - Revision: 5.1
APPLIES TO
  • Microsoft Internet Information Services version 5.1
  • Microsoft Internet Information Services 5.0
  • Microsoft Internet Information Server 4.0
Keywords: 
kbnosurvey kbarchive kbbug kbfix kbsecurity kbwin2000presp3fix kbwin2000sp3fix KB317196

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