Re: Dictionary and brute forcing web authentication?

["Chris Varenhorst" <hiyachris86 () hotmail com>]

Is it possible to just specify the failure string as a string from the login 
page?  The <title> tag works well especially since its likely that the login 
page, says something about how this is the login page in the title.  And as 
far as the password "popups" you mentioning happening in IE, you're right 
those most likely are NOT http application web authentication but http 401 
authentications which are part of the HTTP protocol.  I'm sure the query 
string "http authentication 401 brute force" in a Google and a little bit of 
time will find something to brute force those...

> From: "Mark G. Spencer" <mspencer () evidentdata com>
> To: <webappsec () securityfocus com>
> Subject: Dictionary and brute forcing web authentication?
> Date: Fri, 12 Sep 2003 12:55:41 -0700
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>
> I'm looking for advice on dictionary and brute forcing web authentication.
> Most of the websites I have access to at work have various kinds of forms
> based authentication.  I've been playing with a plugin for Sleuth
> (httpbrute_plugin.zip) and am having difficulty.
>
> At a minimum I need to give the plugin the user and password fields from 
> the
> source of the webpage so it knows where to perform the dictionary attack.  
> I
> also need a failure string so the plugin knows when it has failed (and if 
> it
> hasn't failed, theoretically succeeded), but herein lies the problem.  I'm
> looking at a page called "securedefault.asp" .. When I enter a bogus
> username and password, the login screen just displays again .. No special
> failure message.
>
> Any ideas how to handle this?
>
> Also .. I noticed on some websites that as soon as you go to them, a user
> and password box pops up.  I am not able to view source on these, either in
> IE or Sleuth.  In IE the user and password box opens immediately, and in
> Sleuth I get a Windows username and password box.  I'm assuming these are
> *not* basic http authentication?  Any advice on how to dictionary attack
> these things?
>
> Thanks!
>
> Mark

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