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Re: Session Hijacking over HTTP
From: "Serg B" <sergeslists () gmail com>
Date: Wed, 19 Mar 2008 13:07:12 +1100

Jerry,

You are partially correct, in some cases this would not be possible.
However, generally speaking this is a solution.

See http://www.owasp.org/index.php/Session_Management, section 8.2:
How to protect yourself.

   Serg


On Wed, Mar 19, 2008 at 10:38 AM, Shenk, Jerry A
<jshenk () decommunications com> wrote:
Sometimes, tying an http session to an IP address will incorrectly kick
 users out who are going through proxies.  AOL traffic causes this at
 times by switching proxies.  Since HTTP is a protocol that makes lots of
 different connections, the browser can easily (but not often) change IP
 addresses during a session.

 The fact that each HTTP connection is a different IP session makes using
 ports in the session management a problem too....in fact, I don't see
 how that would work at all.



 -----Original Message-----
 From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
 On Behalf Of Serg B
 Sent: Tuesday, March 18, 2008 6:42 PM
 To: 11ack3r
 Cc: pen-test () securityfocus com
 Subject: Re: Session Hijacking over HTTP

 To protect session cookies you can set the cookie property: to send
 only over SSL.  Also, regenerate SID after the user has authenticated
 to the application - this will safe guard their account in case the
 SID was compromised prior to authentication.  The SID itself should be
 custom generated and include a digest of the following client
 properties (can be more, this is the minimum): IP address, port
 number, agent string.  This way a session will be tied to a particular
 machine and user. This is the industry best practice.

 Don't worry about building "custom browser or enterprise solution"
 since it will only complicate things and get you hacked, remember the
 KISS principle.  This is of course excluding the fact that it sounds
 like a complete bandaid solution to a problem that should be solved at
 design or implementation stage of the SDLC. In regards to the "trusted
 channel" - SSL is about as trusted a it gets (excluding my uber army
 of specially trained carrier pidgins of course).

 Serg


 On Tue, Mar 18, 2008 at 10:21 PM, 11ack3r <11ack3r () gmail com> wrote:
 > Hello Everyone,
 >
 >  I was curious to know how would webmail portals like gmail.com and
 >  yahoo.com protect their users from session hijacking when they use
 >  HTTP after authentication.
 >
 >  As I see it is trivial to capture traffic over the wire including
 >  session cookies. In such a case can an attacker just reuse the
 session
 >  cookies in his/her browser and compromise the user account?
 >
 >  WHat is the best way to protect session cookies from hijacking esp.
 >  due to network eavesdropping? Of course HTTPS can also be bypassed
 >  with MITM attacks if users ignore browser warnings.
 >
 >  Looking forward to some knowledge here.
 >
 >  Cheers!!
 >
 >
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 >

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