Microsoft IIS 5.1

Introduction: 
Although IIS5 is very old, finding one is not impossible! Therefore, I want to introduce a technique to bypass the IIS authentication methods on a directory. 

This vulnerability is because of using Alternate Data Stream to open a protected folder. All of IIS authentication methods can be circumvented. In this technique, we can add a “:$i30:$INDEX_ALLOCATION” to a directory name to bypass the authentication. 
It is possible to run “secretfile.asp” by using: 
“/AuthNeeded:$i30:$INDEX_ALLOCATION/secretfile.asp” 
Instead of: 
“/AuthNeeded/secretfile.asp”

update to IIS 6.0 and Or higher

Microsoft
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http://www.microsoft.com/