Date: Mon, 10 Aug 2009 23:27:58 -0400
From: laurent gaffie <laurent.gaffie@...il.com>
To: ehmo <diskusie@...il.com>, full-disclosure@...ts.grok.org.uk
Subject: Re: WordPress <= 2.8.3 Remote admin reset password

Well, i dont think so, that's why i published this.
It very limitated.
It's true, someone can make a loop script and avoid any possibility to log
back on your wordpress blog, but you also can avoid that functionality
easily, you just need to comment out 1 line.
Anyways, a patch should come out soon.

Regards Laurent Gaffié




2009/8/10 ehmo <diskusie@...il.com>

> Very nice Laurent. That will hurt many ppl
>
> laurent wrote,
> > =============================================
> > - Release date: August 10th, 2009
> > - Discovered by: Laurent Gaffié
> > - Severity: Medium
> > =============================================
>
> > I. VULNERABILITY
> > -------------------------
> > WordPress <= 2.8.3 Remote admin reset password
>
> > II. BACKGROUND
> > -------------------------
> > WordPress is a state-of-the-art publishing platform with a focus on
> > aesthetics, web standards, and usability.
> > WordPress is both free and priceless at the same time.
> > More simply, WordPress is what you use when you want to work with your
> > blogging software, not fight it.
>
> > III. DESCRIPTION
> > -------------------------
> > The way Wordpress handle a password reset looks like this:
> > You submit your email adress or username via this form
> > /wp-login.php?action=lostpassword ;
> > Wordpress send you a reset confirmation like that via email:
>
> > "
> > Someone has asked to reset the password for the following site and
> username.
> > http://DOMAIN_NAME.TLD/wordpress
> > Username: admin
> > To reset your password visit the following address, otherwise just ignore
> > this email and nothing will happen
>
> >
> http://DOMAIN_NAME.TLD/wordpress/wp-login.php?action=rp&key=o7naCKN3OoeU2KJMMsag
> > "
>
> > You click on the link, and then Wordpress reset your admin password, and
> > sends you over another email with your new credentials.
>
> > Let's see how it works:
>
>
> > wp-login.php:
> > ...[snip]....
> > line 186:
> > function reset_password($key) {
> >     global $wpdb;
>
> >     $key = preg_replace('/[^a-z0-9]/i', '', $key);
>
> >     if ( empty( $key ) )
> >         return new WP_Error('invalid_key', __('Invalid key'));
>
> >     $user = $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->users
> WHERE
> > user_activation_key = %s", $key));
> >     if ( empty( $user ) )
> >         return new WP_Error('invalid_key', __('Invalid key'));
> > ...[snip]....
> > line 276:
> > $action = isset($_REQUEST['action']) ? $_REQUEST['action'] : 'login';
> > $errors = new WP_Error();
>
> > if ( isset($_GET['key']) )
> >     $action = 'resetpass';
>
> > // validate action so as to default to the login screen
> > if ( !in_array($action, array('logout', 'lostpassword',
> 'retrievepassword',
> > 'resetpass', 'rp', 'register', 'login')) && false ===
> > has_filter('login_form_' . $action) )
> >     $action = 'login';
> > ...[snip]....
>
> > line 370:
>
> > break;
>
> > case 'resetpass' :
> > case 'rp' :
> >     $errors = reset_password($_GET['key']);
>
> >     if ( ! is_wp_error($errors) ) {
> >         wp_redirect('wp-login.php?checkemail=newpass');
> >         exit();
> >     }
>
> >     wp_redirect('wp-login.php?action=lostpassword&error=invalidkey');
> >     exit();
>
> > break;
> > ...[snip ]...
>
> > You can abuse the password reset function, and bypass the first step and
> > then reset the admin password by submiting an array to the $key variable.
>
>
> > IV. PROOF OF CONCEPT
> > -------------------------
> > A web browser is sufficiant to reproduce this Proof of concept:
> > http://DOMAIN_NAME.TLD/wp-login.php?action=rp&key[]=<http://DOMAIN_NAME.TLD/wp-login.php?action=rp&key%5B%5D=>
> > The password will be reset without any confirmation.
>
> > V. BUSINESS IMPACT
> > -------------------------
> > An attacker could exploit this vulnerability to compromise the admin
> account
> > of any wordpress/wordpress-mu <= 2.8.3
>
> > VI. SYSTEMS AFFECTED
> > -------------------------
> > All
>
> > VII. SOLUTION
> > -------------------------
> > No patch aviable for the moment.
>
> > VIII. REFERENCES
> > -------------------------
> > http://www.wordpress.org
>
> > IX. CREDITS
> > -------------------------
> > This vulnerability has been discovered by Laurent Gaffié
> > Laurent.gaffie{remove-this}(at)gmail.com
> > I'd like to shoot some greetz to securityreason.com for them great
> research
> > on PHP, as for this under-estimated vulnerability discovered by
> Maksymilian
> > Arciemowicz :
> > http://securityreason.com/achievement_securityalert/38
>
> > X. REVISION HISTORY
> > -------------------------
> > August 10th, 2009: Initial release
>
> > XI. LEGAL NOTICES
> > -------------------------
> > The information contained within this advisory is supplied "as-is"
> > with no warranties or guarantees of fitness of use or otherwise.
> > I accept no responsibility for any damage caused by the use or
> > misuse of this information.
>
> _______________________________________________
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