From: dcopley at eEye.com (Drew Copley)
Subject: RE: COELACANTH: Phreak Phishing Expedition]

 

> -----Original Message-----
> From: Jelmer [mailto:jkuperus@...net.nl] 
> Sent: Friday, June 11, 2004 3:22 PM
> To: 'Thor Larholm'; Drew Copley; 
> full-disclosure@...ts.netsys.com; bugtraq@...urityfocus.com
> Cc: ntbugtraq@...tserv.ntbugtraq.com
> Subject: RE: COELACANTH: Phreak Phishing Expedition]
> 
> Almost correct, though not quite, I fired up a packetsniffer 
> while clicking
> the link and witnessed a dns lookup taking place
> 
> --snip--
> 
> Standard query www.jelmer.com?redir=www.e-gold.com
> 
> --snip--
> 
> This actually resolves to e-gold As you can see
> 
>   C:\ >ping www.jelmer.com?redir=www.e-gold.com
> 
>   Pinging www.jelmer.com?redir=www.e-gold.com [63.240.230.10] 
> with 32 bytes 
>   of data: 
> 
> This is because they have setup wildcard dns for e-gold.com
> So the combination ignore host header *AND* wildcard dns leads to an
> exploitable condition
> 
> Tmf.nl for instance uses wildcard dns but complains about a 
> malformed Host
> header

Again, everybody ignores the host header. I routinely use "whatever"
as my host header. A poster to bugtraq was correct, though, some
characters
will cause bad request returns with some web servers. Encoding these
characters will allow them through in some situations (Google.com),
and some servers will continue to have problems (apache.org does not
like the backslash unencoded normally -- the other script characters
and such are fine with it).


In some scenarios, encoding the characters should work.

As IE is forming the malformed host header in the connect, and
this is causing some problems with exploitability, it may/probably
is possible to put in some control line feeds to start a new line
for the request header. It might further be noted the full control
line feed sequence is not needed for a new line for some servers...
and there are other characters which are possibly interpreted as
this. (IIS and Apache, have, historically, allowed such situations,
which have helped in IDS evasion scenarios).



> 
> <a href="http://www.microsoft.com%2F redir=www.tmf.nl">test</a>
> 
> 
> -----Original Message-----
> From: Thor Larholm [mailto:thor@...x.com] 
> Sent: vrijdag 11 juni 2004 3:10
> To: Drew Copley; full-disclosure@...ts.netsys.com; 
> bugtraq@...urityfocus.com
> Cc: ntbugtraq@...tserv.ntbugtraq.com
> Subject: RE: COELACANTH: Phreak Phishing Expedition]
> 
> You can't replicate this with most other servers because the 
> Host header
> is set to a non-existant site on most servers.
> 
> Whenever IIS or Apache receives a request it will first locate the
> proper site based on the IP adress being used, after which it will
> lookup based on the Host header. In the case of e-gold, they 
> have simply
> not specified a Host header for the IIS website that they configured.
> You can send a HTTP request to e-gold.com with "Host: foobar" 
> and their
> site still comes up, even though you should only get their site with a
> header such as "Host: e-gold.com" or "Host: www.e-gold.com".
> 
> HTTP 1.1 requires the use of a Host header and it is bad practice to
> accept HTTP requests without a Host header that corresponds 
> to a locally
> configured site. In most cases with IIS, this only happens if you are
> using the Default Website or explicitly has choosen to not specify a
> Host header for the site. You can specify multiple Host headers for a
> site so there is not much excuse not to do so.
> 
> Whenever IE wants to send an HTTP request it first needs to determine
> what server to connect to. Because of the URL escaping IE disregards
> anything before the slash and equal sign, and sees that it has to send
> an HTTP request to www.e-gold.com. It is only after IE has determined
> what server to request information from that it URL decodes 
> the URI and
> ends up with http://www.microsoft.com/redir=www.e-gold.com, which it
> then displays in the Address Bar and subsequently uses to 
> determine what
> security zone it should use to render the HTML. IE only decides what
> security zone to use based on the Address Bar value after it has
> successfully downloaded all of the HTML (untill then it is in the
> Unknown Zone), at which point the URL decoding has long since 
> happened.
> 
> If you want to exploit this to serve content from your site in the
> security zone of another site, you will need to disregard the Host
> header being sent by the client. A perfect candidate you can 
> use to gain
> additional privileges is WindowsUpdate.microsoft.com or
> oca.microsoft.com who are both in the Trusted Sites security zone on a
> default installation of Windows Server 2003 and Windows XP SP2. 
> 
> You should be able to use this to compromise Windows XP SP2 through
> Internet Explorer despite the My Computer zone hardening since the
> Trusted Sites Zone has all of the privileges you need to plant and
> execute a file.
> 
> 
> 
> Regards
> 
> Thor Larholm
> Senior Security Researcher
> PivX Solutions
> 24 Corporate Plaza #180
> Newport Beach, CA 92660
> http://www.pivx.com
> thor@...x.com
> Stock symbol: (PIVX)
> Phone: +1 (949) 231-8496
> PGP: 0x5A276569
> 6BB1 B77F CB62 0D3D 5A82 C65D E1A4 157C 5A27 6569
> 
> PivX defines a new genre in Desktop Security: Proactive Threat
> Mitigation. 
> <http://www.pivx.com/qwikfix>
> 
> 
> -----Original Message-----
> From: Drew Copley [mailto:dcopley@...e.com] 
> Sent: Thursday, June 10, 2004 4:40 PM
> To: full-disclosure@...ts.netsys.com; bugtraq@...urityfocus.com
> Subject: RE: [Fwd: [Full-Disclosure] COELACANTH: Phreak Phishing
> Expedition]
> 
> 
> 
> 
> 
> > Subject: [Full-Disclosure] COELACANTH: Phreak Phishing Expedition
> > From:    "http-equiv@...ite.com" <1@...ware.com>
> > Date:    Thu, June 10, 2004 12:35 pm
> > To:      full-disclosure@...ts.netsys.com
> > --------------------------------------------------------------
> > ------------
> > 
> > 
> > 
> > Thursday, June 10, 2004
> > 
> > The following was presented by 'bitlance winter' of Japan today:
> > 
> > <a href="http://www.microsoft.com%2F redir=www.e- gold.com">test</a>
> > 
> > Quite inexplicable from these quarters. Perhaps someone with server 
> > 'knowledge' can examine it.
> > 
> > It carries over the address into the address bar:
> > 
> > [screen shot: http://www.malware.com/gosh.png 72KB]
> > 
> > while redirecting to egold. The key being %2F without that 
> it fails. 
> > The big question is where is the 'redir' and why is it only 
> applicable
> 
> > [so far] to e-gold. Other sites don't work and e- gold is 
> running an 
> > old Microsoft-IIS/4.0.
> 
> 
> IE makes this into a connection with e-gold.com like so:
> 
> GET / HTTP/1.1
> Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
> application/vnd.ms-excel, application/vnd.ms-powerpoint,
> application/msword, application/x-shockwave-flash, */*
> Accept-Language: en-us
> Accept-Encoding: gzip, deflate
> User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 
> 5.2; .NET CLR
> 1.1.4322; .NET CLR 1.0.3705)
> Host: www.microsoft.com/ redir=www.e-gold.com
> Connection: Keep-Alive
> 
> It never touches microsoft.com.
> 
> What is interesting, though, is IE spoofs the zone. If you change
> www.microsoft.com in there to a site in your trusted zone, 
> you will see
> e-gold read as your trusted zone.
> 
> So, you should be able to bounce from any trusted zone and 
> theoritically
> from local zone -- and with adodb still being open, you should be able
> to run code because of the open adodb issue.
> 
> IE doesn't talk to e-gold first. It connects to it. It sends the GET
> request, it receives the first page. 
> 
> But, can't replicate with other servers. It requires some 
> more research.
> 
> 
> > 
> > Working Example:
> > 
> > http://www.malware.com/golly.html
> > 
> > 
> > credit: 'bitlance winter'
> > 
> > 
> > End Call
> > 
> > --
> > http://www.malware.com
> > 
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > Full-Disclosure - We believe in it.
> > Charter: http://lists.netsys.com/full-disclosure-charter.html
> > 
> > 
> > 
> 
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.netsys.com/full-disclosure-charter.html
> 
> 
> 
> 

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