WordPress2.8.3远程管理员密码重置漏洞

      WordPress 2.8.3存在利用wp-login.php恶意重置管理员密码的漏洞，不过遗憾的是密码被重置后我们并不能直接拿到，而是直接将新密码发送至管理员邮箱。如果能搞定管理员邮箱，那么。。
      据悉，WP已经放出了相关补丁，请用WP的童鞋及时升级覆盖该漏洞文件。
      漏洞发布日期：2009.8.10
      存在漏洞WordPress版本：WordPress 2.8.3及更低
      攻击办法：
      访问http://www.xxx.com/wp-login.php?action=lostpassword，WordPress会向管理员邮箱发送一封邮件，大意为有人要求重置管理员密码，并在邮件中给出一个链接，点击链接后确认重置密码，并将收到另一封包含重置密码的邮件。
      更狠的招：访问http://www.xxx.com/wp-login.php?action=rp&key[]=，WordPress将强制重置密码而无需管理员确认。当然重置后的密码仍然是被发送到管理员邮箱的。

      想了解细节的往下看。

=============================================
– 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 Roger2011_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 Roger2011_Error('invalid_key', __('Invalid key'));
…[snip]….
line 276:
$action = isset($_REQUEST['action']) ? $_REQUEST['action'] : 'login';
$errors = new Roger2011_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_Roger2011_error($errors) ) {
        Roger2011_redirect('wp-login.php?checkemail=newpass');
        exit();
    }

    Roger2011_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[]=
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.

# milw0rm.com [2009-08-11]

转载请尊重版权，出处：秋天博客
本文链接: https://www.cfresh.net/web-security/115