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From: samuel at bcgreen.com (Stephen Samuel)
Subject: Re: Mozilla Firefox Certificate Spoofing

Has this been posted to bugilla????


E.Kellinis wrote:
> #########################################
> Application:    Mozilla Firefox
> Vendors:        http://www.mozilla.com
> Version:         0.9.1 / 0.9.2
> Platforms:       Windows
> Bug:               Certificate Spoofing (Phishing)
> Risk:              High
> Exploitation:   Remote with browser
> Date:             25 July 2004
> Author:          Emmanouel Kellinis
> e-mail:           me@...her(dot)org(dot)uk
> web:              http://www.cipher.org.uk
> List :              BugTraq(SecurityFocus)/ Full-Disclosure
> #########################################
> 
> 
> =======
> Product
> =======
> A popular Web browser,good alternative of IE and 
> "The web browser" for linux machines,
> used to view pages on the World Wide Web.
> 
> ===
> Bug
> ===
> 
> Firefox has caching problem, as a result of that someone can 
> spoof a certificate of any website and use it as his/her own.
> The problem is exploited using onunload inside  < body> and 
> redirection using Http-equiv Refresh metatag,document.write()
> and document.close()
> 
> First you direct the redirection metatag to the website 
> of which you want to spoof the certificate, then inside 
> the < body> tag you add onulnoad script so you can control
> the output inside the webpage with the spoofed certificate.
> 
> After that you say to firefox, as soon as you unload this page 
> close the stream, aparently the stream you close is 
> the redirection website, you do that with 
> document.close().
> 
> Now you can write anything you want , you do that 
> using document.write(). After writing the content of you choice
> you close the stream again , usually firefox wont display your content,
> although if you check the source code you see it , so the last thing 
> is to refresh the new page (do that using window.location.reload()), 
> after that you have your domain name in the url field , your content 
> in the browser and the magic yellow Lock on the bottom left corner, 
> if you pass your mouse over it you will see displayed the name of 
> the website you spoofed the certificate, if you double click on it you 
> will check full information of the certificate without any warning !
> 
> You dont need to have SSL in your website ! it will work with 
> http.
> 
> Additional using this bug malicious websites can bypass content 
> filtering using SSL properties.
> 
> 
> =====================
> Proof Of Concept Code
> =====================
> 
> < HTML>
> < HEAD>
> < TITLE>Spoofer< /TITLE>
> < META HTTP-EQUIV="REFRESH" CONTENT="0;URL=https://www.example.com">
> < /HEAD>
> < BODY 
> onunload="
> document.close();
> document.writeln('< body onload=document.close();break;>
>             < h3>It is Great to Use example's Cert!');
> 
> document.close();
> window.location.reload();
> ">
> < /body>
> 
> 
> =========================================================
> *PK:http://www.cipher.org.uk/files/pgp/cipherorguk.public.key.txt
> =========================================================


-- 
Stephen Samuel +1(604)876-0426                samuel@...reen.com
		   http://www.bcgreen.com/~samuel/
    Powerful committed communication. Transformation touching
      the jewel within each person and bringing it to light.


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