BugTraq
Remote IIS 5.x and IIS 6.0 Server Name Spoof Aug 22 2005 03:23PM
inge_eivind henriksen chello no (1 replies)
Re: Remote IIS 5.x and IIS 6.0 Server Name Spoof Aug 23 2005 10:19AM
3APA3A (3APA3A SECURITY NNOV RU)
Dear inge_eivind.henriksen (at) chello (dot) no [email concealed],

The bug here is not in ability to spoof SERVER_NAME, because SERVER_NAME
is untrusted data from Host: request header or from proxy-style HTTP
request (like in case of your example). SERVER_NAME is ALWAYS untrusted
data. The bug here is in the way SERVER_NAME is used in error page
genaration. So, you article should be called something like "Microsoft
IIS error page access validation weakness". If any script use
SERVER_NAME in this way, this is vulnerability of the script itself.

--Monday, August 22, 2005, 7:23:08 PM, you wrote to bugtraq (at) securityfocus (dot) com [email concealed]:

ihcn> 6. Try and access it from a remote server with telnet again. This time use the following HTTP request:
ihcn> GET http://localhost/test.asp HTTP/1.0

--
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