From: Pilon Mntry (pilonmntryyahoo.com)
Date: Wed Apr 05 2006 - 03:41:56 CDT

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 We know that a web application having an
authentication page (form-based) should send a 302
Redirection response upon a successful login attempt.
(this is to avoid the possibility of a re-post by the
attacker)

 However, the same should be applied to unsuccessful
login attempts, too. Because if a client enters wrong
credentials and get an error page with 200 OK, a
re-post is possible, only providing the wrong
credentials to an attacker. And these wrong
credentials might just have been slightly mistyped
(for example, because of wrong keyboard layout or
capslock) and still valuable to an attacker on a
machine with public access left open by a frustrated
victim (due to unsuccessful login attempts) ...

-pilon

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