Re: Bruteforce HTTP Basic authentification

[Chris Kuethe <chris.kuethe () gmail com>]

On 8/19/05, someone asked me:
> Where could I find a frequency analyzer? Is that something you custom
> wrote?

It's another little custom bit of perl. again, this is dead easy in a
couple of screens of perl. roughly like this

foreach $word (<>) {
    $n = 0;
    foreach $c (split(//, $word)){
        $freq{$n}->{$chars[0]}++;
        $n++;
    }
}

and then print the resulting hash through whatever method you choose
(use perl's built-in sort, or offload it to /usr/bin/sort...)

> -----Original Message-----
>
> From: Chris Kuethe [mailto:chris.kuethe () gmail com]
> Sent: Thursday, August 18, 2005 4:06 PM
> To: Serg Belokamen; Pen Test
> Subject: Re: Bruteforce HTTP Basic authentification
>
> By optimized alphabet, I mean sort the letters to be tried by order of
> frequency in your probably target language. You could try AAAAAAAA,
> AAAAAAAB, AAAAAAAC, ... but there's a reason why they give you "RSTLNE"
> for free on Wheel of Fortune.
>
> The last big brute force I did, I took the standard unix dictionaries,
> plus the text of a bunch of ebooks I had on my laptop and came up with
> frequency distributions for the first through fourth letters of the
> average english word. As I was targetting a system where most of the
> users were native english-speakers, I figured this was a safe assumption
> to make. It took some minutes for my frequency counter to run, but when
> I was finished, I had a set of alphabets that made it a lot more
> effective to search for dictionary words, their leetspeak variants, and
> finally alphanumeric keyboard smashing...
>
> CK
>
> On 8/17/05, Serg Belokamen <serg.belokamen () gmail com> wrote:
> > What do you "optimised alphabet" ... any URL's etc?
> >
> >    Cheers,
> >       Serg
> >
> > On 18/08/05, Chris Kuethe <chris.kuethe () gmail com> wrote:
> > > On 8/17/05, nik <nik () adminzone ru> wrote:
> > > > Hello list!
> > > > I'm doing little pen-test of a web-application for a small
> > > > company.
> > > > This application uses HTTP Basic autintification. So the question
> > > > is:
> > > > does any one know some tools (such as brutus) for brutforce
> > > > usernames and passwors for this type of authentification. These
> > > > tools must run under Linux or FreeBSD.
> > >
> > > The LWP perl module will do quite nicely. Combine that with an
> > > optimized alphabet or 4, and you can have a very effective brute
> > > forcer in a couple of screenfuls of code. Optimizing your alphabet
> > > can be very effective, taking the time to crack a password down from
>
> > > hours to minutes or even seconds if you have a good idea about the
> > > letter distribution. ;)
> > >
> > > CK


-- 
GDB has a 'break' feature; why doesn't it have 'fix' too?

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