SYMPTOMS
A security patch has been released that resolves a canonicalization error that can allow a malicious user to gain additional permissions to certain types of files that are hosted on a Web server.
For this vulnerability to be exploited, several factors are involved:
- Only file types that are implemented through ISAPI extensions are affected. It does not affect static Web page or non-Web file types such as .exe, .doc, or .bat.
- It only affects servers that expose a Web folder structure that mirrors the physical folder structure on the server. It does not impact virtual directories.
- It does not allow arbitrary permissions to be selected, only permissions present on an ancestor folder.
- It provides no ability to enumerate the server and locate files that can be affected by the vulnerability.
In addition to the above, this security patch also corrects the vulnerability described by the following article in the Microsoft Knowledge Base:
276489 Patch available for Web server folder traversal vulnerability
Microsoft Exchange 2000 Server users and Microsoft SharePoint Portal Server 2001 users
Both Exchange 2000 and SharePoint Portal Server 2001 have problems with an older verison of this hotfix. A new update for the security patch for these products is available
at the following Microsoft Web page:
RESOLUTION
To resolve this problem, obtain the latest service pack for Windows 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
260910 How to obtain the latest Windows 2000 service pack
Internet Information Services 5.0
The following file is available for download from the Microsoft Download Center:
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 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
-----------------------------------------------------
08-09-2000 1:02pm 5.0.2195.2103 357,136 W3svc.dll
Internet Information Server 4.0
The following files are available for download from the Microsoft
Download Center:
NOTE: Debug symbol files are required by an administrator to do both kernel and user mode debugging, providing a method to resolve global variables and function names in the loaded file. The symbol files are denoted with an "s" in the file name (for example, Prmcan4is.exe).
US English
Intel:
Intel Symbols:
Alpha:
Alpha Symbols:
German
Intel:
Intel Symbols:
Alpha:
Alpha Symbols:
Japanese
Intel:
Intel Symbols:
Alpha:
Alpha Symbols:
Korean
Intel:
Intel Symbols:
Alpha:
Alpha Symbols:
Simplified Chinese
Intel:
Intel Symbols:
Alpha:
Alpha Symbols:
Traditional Chinese
Intel:
Intel Symbols:
Alpha:
Alpha Symbols:
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 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 Size File name Platform
---------------------------------------------------
08/03/2000 05:06p 330,080 Asp.dll Intel
08/03/2000 05:04p 185,792 Infocomm.dll Intel
08/03/2000 05:05p 38,256 Ssinc.dll Intel
08/03/2000 05:05p 25,360 Sspifilt.dll Intel
08/03/2000 05:05p 228,496 W3svc.dll Intel
08/03/2000 05:08p 551,696 Asp.dll Alpha
08/03/2000 05:06p 304,912 Infocomm.dll Alpha
08/03/2000 05:07p 60,176 Ssinc.dll Alpha
08/03/2000 05:07p 39,696 Sspifilt.dll Alpha
08/03/2000 05:07p 384,272 W3svc.dll Alpha
Microsoft Windows NT Server version 4.0, Terminal Server Edition
To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package
(SRP).
For more information about the SRP, click the following article number to view the article in the Microsoft Knowledge Base:
317636
Windows NT Server 4.0, Terminal
Server Edition, Security Rollup Package
