MS02-018: Patch Available for Denial of Service Through FTP Status Request Vulnerability (317196)
The information in this article applies to:
- Microsoft Internet Information Services version 5.1
- Microsoft Internet Information Services 5.0
- Microsoft Internet Information Server 4.0
This article was previously published under Q317196 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.
RESOLUTIONInternet Information Services 5.1
The update for this problem is included in the "MS02-018: April 2002 Cumulative Patch for Internet Information Services". For additional information about how to obtain this patch, click the article number below
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 additional information about how to obtain this patch, click the article number below
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 additional information about how to obtain this patch, click the article number below
to view the article in the Microsoft Knowledge Base:
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.
| Modification Type: | Minor | Last Reviewed: | 11/17/2005 |
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| Keywords: | kbbug kbfix kbSecurity kbWin2000PreSP3Fix kbWin2000sp3fix KB317196 |
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