This article was previously published under Q298340
This article has been archived. It is offered "as is" and will no longer be updated.
In Internet Information Services (IIS) 5.0, a denial of service vulnerability exists that an attacker could exploit to temporarily disrupt Web services on an IIS 5.0 server.
The effect of an attack would be temporary. The server would automatically resume normal service as soon as the malformed requests stopped arriving.
This vulnerability does not provide an attacker with any capability to carry out WebDAV requests.
This vulnerability does not provide any capability to compromise data on the server or gain administrative control over it.
This vulnerability only affects IIS 5.0.
This vulnerability occurs because of the way that WebDAV handles a particular type of very long, invalid request. The net effect is to cause an access violation that results in the failure of the IIS 5.0 process.
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 theMicrosoft Knowledge Base:
260910 How to Obtain the Latest Windows 2000 Service Pack
The English version of this fix should have the following file attributes or later:
Date Time Version Size File name ------------------------------------------------------ 12-May-2001 1815 5.0.2195.3608 246,032 Httpext.dll
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Internet Information Services 5.0. This problem was first corrected in Windows 2000 Service Pack 3.
This patch also contains fixes for the problems described in the following Microsoft Knowledge Base article:
297860 IIS 5.0 Security and Post-Windows NT 4.0 SP5 IIS 4.0 Patch Rollup
For more information on this vulnerability, see the following Microsoft Web site: