IIS 5 Authentication Bypass

`Description:  
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.  
In a protected folder such as “AuthNeeded” which includes “secretfile.asp”:  
It is possible to run “secretfile.asp” by using:  
“/AuthNeeded:$i30:$INDEX_ALLOCATION/secretfile.asp”  
Instead of:  
“/AuthNeeded/secretfile.asp”  
  
More description:  
Why IIS6 and 7 are not vulnerable:  
- In these versions, IIS does not accept colon (“:”) character from the URL before the querystring.  
  
Why we cannot use “::$Data” in IIS 5.1 anymore:  
- IIS rejects the request if its URL contains “::$” (before querystring).  
  
Why IIS5 is vulnerable to “Directory Authentication Bypass” by using “:$I30:$Index_Allocation”:  
- IIS only verifies the directory name to check for authentication. Therefore, we can use “http://victim.com/SecretFolder:$I30:$Index_Allocation/” instead of “http://victim.com/SecretFolder” to bypass the authentication.  
  
Is it possible to bypass something else by using “:$I30:$Index_Allocation” on a NTFS partition:  
- If a checking is only based on the directory name, it can be bypassed by using this method.  
  
Download this advisory from: http://soroush.secproject.com/downloadable/IIS5.1_Authentication_Bypass.pdf  
or: http://0me.me/demo/IIS/IIS5.1_Authentication_Bypass.pdf  
  
  
  
  
More here:  
  
http://soroush.secproject.com/blog/2010/07/iis5-1-directory-authentication-bypass-by-using-i30index_allocation/  
`