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Re: Newbie HTTPS/SSL question
From: "Darragh O'Brien" <dobrien () computing dcu ie>
Date: Mon, 15 Dec 2003 12:20:20 +0000


Thanks for the pointers James. The reason I ask is because I came
across a web site which functions as follows:

When we go to the site a session-id is immediately assigned and
becomes part of URLs accessed over HTTP. When it comes to
purchasing something, credit card details etc. are passed over
HTTPS. Great. However, should a user make an error in filling in,
say their e-mail address, an error page is generated containing the
entire form (credit card details included). The problem is that the
URL of the error page is entirely determined by the session-id passed
about initially over HTTP. So at the very least a web admin could log
URLs, grab session-ids and probe for the error page. This is a problem,

I thought that by tying the error page to a particular HTTPS session
they might solve this problem. It looks like that's not possible.


On Thursday 11 December 2003 19:14, jamesworld () intelligencia com wrote:

You allude to the answer to your question in your question:  session
Do a google search on http session state and get an understanding of that,
then look at https session states.
Take a look at:

for a real brief, clean look at what happens under the hood.

Short answer:  no  :-)

Session keys are supposed to be unique.  If not, you'd have a huge replay
attack problem.

great question.  it shows that you are actually thinking about the inner
workings.  Keep up the questions, both internal and to the list.


At 07:21 12/11/2003, Darragh O'Brien wrote:

Is it possible to tie a web page to a particular HTTPS session
so that when requested it is always sent back encrypted with
the server key associated with that session? That way, guessing
the URL of a dynamically created page would not be enough
since we don't have the client key to decrypt it?

Or am I talking nonsense!?





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