Re: Bruteforce HTTP Basic authentification

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

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

------------------------------------------------------------------------------
FREE WHITE PAPER - Wireless LAN Security: What Hackers Know That You Don't

Learn the hacker's secrets that compromise wireless LANs. Secure your
WLAN by understanding these threats, available hacking tools and proven
countermeasures. Defend your WLAN against man-in-the-Middle attacks and
session hijacking, denial-of-service, rogue access points, identity
thefts and MAC spoofing. Request your complimentary white paper at:

http://www.securityfocus.com/sponsor/AirDefense_pen-test_050801
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