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MS02-018: Patch available for denial of service through FTP status request vulnerabilityArticle ID: 317196 - View products that this article applies to. This article was previously published under Q317196 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.microsoft.com/technet/security/prodtech/IIS.mspx)
http://www.iis.net/default.aspx?tabid=1
(http://www.iis.net/default.aspx?tabid=1)
On This PageSYMPTOMS
A denial of service
(http://www.microsoft.com/technet/security/bulletin/glossary.mspx)
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
(http://www.microsoft.com/technet/security/tools/locktool.mspx)
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.
RESOLUTIONInternet Information Services 5.1The 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
(http://support.microsoft.com/kb/319733/
)
MS02-018: April 2002 cumulative patch for Internet Information Services
Internet Information Services 5.0The 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
(http://support.microsoft.com/kb/319733/
)
MS02-018: April 2002 cumulative patch for Internet Information Services
Internet Information Server 4.0The 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
(http://support.microsoft.com/kb/319733/
)
MS02-018: April 2002 cumulative patch for Internet Information Services
STATUSInternet Information Services 5.1Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Services 5.1.Internet Information Services 5.0Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Services 5.0.Internet Information Server 4.0Microsoft 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:
(http://www.microsoft.com/technet/security/bulletin/MS02-018.mspx)
265173
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:
(http://support.microsoft.com/kb/265173/
)
Datacenter Program and Windows 2000 Datacenter Server Product
296861
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/296861/
)
How to install multiple Windows updates or hotfixes with only one reboot
824684
(http://support.microsoft.com/kb/824684/
)
Description of the standard terminology that is used to describe Microsoft software updates
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