full-disclosure - Re: Firefox 2.0.0.12 SSL Spoofing and Domain Guessing vulnerabilities

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Message-ID: <47A77744.9020709@nbnet.nb.ca>
Date: Mon, 04 Feb 2008 16:36:20 -0400
From: steve menard <smenard@...et.nb.ca>
To: full-disclosure@...ts.grok.org.uk
Cc: carl hardwick <hardwick.carl@...il.com>
Subject: Re: Firefox 2.0.0.12 SSL Spoofing and Domain
 Guessing vulnerabilities

I get a warning on 2.0.0.11 Linux Ubuntu

You are about to log into the site "google" with the username
"www%2Ecnn@...om%c0%AF%C0%AF%C0%C0%80", but the website does not require 
authentication. this may be an attempt to trick you
Is "google" the site you want to visit.?

is this a 2.0.0.12 issue?
Steve

carl hardwick wrote:
> Firefox seems to have trouble with defining the proper hostname when
> requesting a ssl connection. I was able to trick Firefox in thinking
> the hostname behind the at-sign is legit and the same as the URI that
> requested an ssl connection, and this without a warning.
>
> PoC: https://www.gmail.com%C0%AF%C0%AF%C0%C0%80@...uehost.com
>
> You can add as much garbage between .com and the @ sign.
>
> So what else can we do?
>
> PoC:
> www.cnn.com%C0%AF%C0%AF%C0%C0%80@...gle
> www.gmail.com%C0%AF%C0%AF%C0%C0%80@...mail
>
> ah heck we don't need that at all:
> www.gmail.comxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx@...mail
>
> works fine also :)
>
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