Re: [http-auth] sender IP address modification

Derek Atkins <derek@ihtfp.com> Thu, 17 March 2016 14:19 UTC

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From: Derek Atkins <derek@ihtfp.com>
To: Sarah Cai <sarah_cai2002@yahoo.com>
References: <1703792165.840803.1458100652155.JavaMail.yahoo.ref@mail.yahoo.com> <1703792165.840803.1458100652155.JavaMail.yahoo@mail.yahoo.com>
Date: Thu, 17 Mar 2016 10:18:55 -0400
In-Reply-To: <1703792165.840803.1458100652155.JavaMail.yahoo@mail.yahoo.com> (Sarah Cai's message of "Wed, 16 Mar 2016 03:57:32 +0000 (UTC)")
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Subject: Re: [http-auth] sender IP address modification
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Sarah Cai <sarah_cai2002@yahoo.com> writes:

>   When an http request is sent from client to webserver, is there any way the
> sending IP address can be modified to a fake IP address?

Yes, there are numerous ways to spoof an IP address, even with TCP.
Some attacks require guessing TCP sequence numbers.  Other attacks just
require routability.

-derek
-- 
       Derek Atkins                 617-623-3745
       derek@ihtfp.com             www.ihtfp.com
       Computer and Internet Security Consultant