bugtraq - RE: Proxy - Cookie - PhP

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Message-ID: <006701c3261e$b33364b0$6e01a8c0@tekwiz>
Date: Thu, 29 May 2003 16:12:58 -0400
From: "JT" <ptourvi1@...ny.rr.com>
To: "'morning_wood'" <se_cur_ity@...mail.com>, <vulnwatch@...nwatch.org>,
   <bugtraq@...urityfocus.com>, <full-disclosure@...ts.netsys.com>
Subject: RE: Proxy - Cookie - PhP - .htaccess Questions

Last I knew this was a problem some time ago, Vbulletin had issues and is
the product I'm most experienced with of the bb boards. It's been awhile
since I dealt with it though, but I do believe Vbulletin made some code
changes or instructed a certain config to workaround this. I say workaround
because I do not think there was a fix and the workaround caused other
issues. I think if you search their site you will find many posts regarding
this. I have had two people who use the same proxy actually get switched
logins before. 

-----Original Message-----
From: full-disclosure-admin@...ts.netsys.com
[mailto:full-disclosure-admin@...ts.netsys.com] On Behalf Of morning_wood
Sent: Thursday, May 29, 2003 3:42 PM
To: vulnwatch@...nwatch.org; bugtraq@...urityfocus.com;
full-disclosure@...ts.netsys.com
Subject: [Full-Disclosure] Proxy - Cookie - PhP - .htaccess Questions

------------------------------------------------------------------
- EXPL-C-2003-001 exploitlabs.com conjecture paper 001
------------------------------------------------------------------

-=- PHP and .htaccess Authorization Bypass Conjecture -=-

 If someone could help me with the implications of this scenario :

you = user-ip
proxy = proxy ip
remhost = host-ip

Open browser via proxy to <hostip> with member forum php/BB type with login
/ pass.
( if im correct this sets a cookie to "maintain state"  for session auth)
do stuff.
Change or turn off proxy in browser.
do more stuff.

Q? Are you still authorized?
C? its looks so
A? dunno really, this is why I wrote this. help-me?

My Opinion:
 I think many or most of these php/BB style forums use the <user-ip> as part
of the cookie making ( baking? yum ) authentication and persistant state
process. It just seems odd that thers no obvious change in the auth, but yet
technically the "you' have gone from <proxy-ip> to <user-ip>. This would
seem to enable a "session sharing" scenario if you could corordinate a
common proxy and a cookie sharing routine to bypass a many restriction...
no? Help me figure this out, it is just hypothetical ( hence the
conjecture ). What about .htaccess? does this violate that protection as
well??? I say ...YES. Comments and FACTUAL, LOGICAL theory are asked upon
this as it may ( could ) change the whole aspect of "location" or "absolute"
auth via a IP protocol. ( or I will be highly embarased as to my high level
ignarami )

Donnie Werner
morning_wood@...loitlabs.com
http://exploitlabs.com  "where finding your hole is job one, and plugging it
is half the fun"

oh.. check out http://frame4.com for your corporate security needs.
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