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Re: Authentication flaw in Web Wiz forum
From: Bruce Corkhill <bruce () webwizguide info>
Date: Tue, 02 Mar 2004 21:36:09 +0000

Yet again!! Alexander aka. Pig Killer and Michael have posted an incorrect security bug report without first fully testing there findings first.

The security flaw reported below is incorrect as they state that the user code stored in a cookie is not changed when the password for an account is changed, this is incorrect as the user code is changed often including when the user changes his/her password, unless the forum admin changes the password then the user code is not changed so the user doesn't have to log back in if they request a new password from the forum admin. This maybe be changed in the next version so even if the admin change a password the user code is updated.

At 21:20 02/03/2004, you wrote:

Product:  Web Wiz forum 7.0-7.7a www.webwizforum.com

Risk:          Medium

Date:         02 March, 2004

Autor:        Pig Killer and Michael ( www.SecurityLab.ru)

When user log on forum, for his cookies identification forum using User_code
value from tblAutor table from underlying database, which doesn't change
with changing of password. As a result, when user change password, he can
register in the forum using old cookies. As a result, if users cookies was
compromised (for example by XSS), then even password changing will doesn't
protect his account from unauthorized using.

The forum also allows logged in user to change the password without entering
the old one. Thus, having cookie, you can change the password without
knowing the old one.

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