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Chuck,

On 5/13/2009 8:16 AM, Caldarale, Charles R wrote:
>> From: umeshkavade [mailto:umeshkav...@yahoo.co.in]
>> Subject: Re: Form Based Authentication creates user session before it
>> is authenticated?
>>
>> P.S: BTW, is Tomcat planning to resolve this vulnerability in near
>> future?
> 
> I'll bite: what "vulnerability" are you referring to?

"Session fixation" which is essentially a form of session hijacking.
Basically, you get yourself a session and a session id from the server.
You write that down and walk away. Then, you trick someone else into
sitting down and logging-in. Since the session id does not change, you
can go to another machine, hijack the user's session, and impersonate them.

- -chris
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