------------------------------------------------------------------------ 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 [2] WordPress Plugin version 2.9.0. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue is resolved in Peter's Login Redirect version 2.9.1 [3]. ------------------------------------------------------------------------ Introduction ------------------------------------------------------------------------ The Peter's Login Redirect [2] WordPress Plugin redirect users to different locations after logging in and logging out. 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. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ 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 .= '
'; $rul_roles_existing[$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 ------------------------------------------------------------------------ ------------------------------------------------------------------------ References ------------------------------------------------------------------------ [1] https://sumofpwn.nl/advisory/2016/cross_site_scripting_cross_site_request_forgery_in_peter_s_login_redirect_wordpress_plugin.html [2] https://wordpress.org/plugins/peters-login-redirect/ [3] https://downloads.wordpress.org/plugin/peters-login-redirect.zip