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

[Damien Cauquil <d.cauquil () sysdream com>]

Hi klondike,


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

I guess you now have your answer.

> The guys have a cool XSS injection on the fake webmail service which
can be exploited with a properly crafted subject

You're right, and it has been fixed during the prequals. Anyway, this
vulnerability is minor because teams couldn't send emails to each
others. At least, you can pwn your own web browser.

For the last vuln mentionned, we were aware of it. Guys who wrote the
code were seriously slapped. 

Damien, NDH prequals team

-- 
Damien Cauquil
Directeur de Recherche
CEH, CHFI, ECSA, CEI
Tél. : +33 (0)1 78 76 58 21
Fax.: +33 (0)1 40 12 74 41

Sysdream IT Security Services
108, av. Gabriel Péri
93400 Saint Ouen
http://www.sysdream.com/ 

Le samedi 24 mars 2012 à 05:54 +0100, klondike a écrit :

> 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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