Article ID: 285985 - Last Review: November 21, 2006 - Revision: 5.1 MS01-004: Patch Available for New Variant of File Fragment Reading via .HTR VulnerabilityThis article was previously published under Q285985 On This PageSYMPTOMS
Microsoft has released a patch that eliminates a security vulnerability in Internet Information Server (IIS) 4.0 and Internet Information Services (IIS) 5.0. Under very unusual conditions, this vulnerability can allow an attacker to read fragments of files from a Web server. This vulnerability involves a new variant of the "File Fragment Reading via .HTR" vulnerability, which is described in Microsoft Security Bulletin (MS00-044) (http://www.microsoft.com/technet/security/bulletin/ms00-044.mspx) . Like the other variants, this one may allow an attacker to request a file in a way that causes it to be processed by the .htr ISAPI extension. The result of this is that fragments of server-side files such as .asp files may potentially be sent to the attacker. There is no capability through this vulnerability to add, change, or delete files on the server, or to access a file without permissions. There are a number of significant restrictions on this vulnerability:
RESOLUTIONInternet Information Services 5.0To 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:311401
(http://support.microsoft.com/kb/311401/EN-US/
)
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:
260910
(http://support.microsoft.com/kb/260910/EN-US/
)
How to Obtain the Latest Windows 2000 Service Pack
The following files are available for download from the Microsoft
Download Center:Collapse this image  Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image 119591
(http://support.microsoft.com/kb/119591/EN-US/
)
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 security-enhanced servers that help to 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 Platform ----------------------------------------------------------------- 5/31/2001 03:31p 5.0.2195.3649 46,352 Ism.dll x86 Internet Information Server 4.0Windows NT 4.0To resolve this problem, obtain the Windows NT 4.0 Security Rollup Package. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:299444
(http://support.microsoft.com/kb/299444/EN-US/
)
Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)
Microsoft Windows NT Server version 4.0, Terminal Server EditionTo resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package (SRP). For additional information about the SRP, click the article number below to view the article in the Microsoft Knowledge Base:317636
(http://support.microsoft.com/kb/317636/EN-US/
)
Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package
STATUSMicrosoft has confirmed that this problem may cause a degree of security vulnerability in IIS 4.0 and 5.0. This problem was first corrected in Windows 2000 Service Pack 3. MORE INFORMATIONFor 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:
265173
(http://support.microsoft.com/kb/265173/EN-US/
)
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:
296861
(http://support.microsoft.com/kb/296861/EN-US/
)
Use QChain.exe to Install Multiple Hotfixes with One Reboot
For more information on this security vulnerability, please see the following Microsoft Web site:
http://www.microsoft.com/technet/security/bulletin/ms01-004.mspx
(http://www.microsoft.com/technet/security/bulletin/ms01-004.mspx)
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