phpEventCalendar.txt

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Title: phpEventCalendar HTML injection  
Vulnerability discovery: Madelman <madelman AT iname.com>  
Date: 25/01/2005  
Severity: Medium. Registered users can obtain other users cookies  
  
Summary:  
- --------  
  
phpEventCalendar is a MySQL backed application that allows users to post and  
display events or notes on a month-at-a-glance calendar. A user administration  
panel allows authorized users (Administrators) to control who can add, delete,  
and edit events (Editors).  
(from vendor site: http://www.ikemcg.com/scripts/pec/index.html)  
  
phpEventCalendar doesn't check title and text of events inserted in the database,  
so we can inject arbitrary HTML which will be executed by other users.  
  
This vulnerability has been tested with phpEventCalendar 0.2  
  
  
Details:  
- --------  
  
When inserting a new event into the system, phpEventCalendar doesn't check the  
values of title and text variables, it only escapes it when necessary to avoid  
SQL injection. These variables will be later retrieved by other user viewing the  
calendar and showed with strip_slashes so we can write arbitrary HTML (or Javascript)  
which will be executed by other users when they look at the calendar (if inserted in  
title, but take care there's a limit in the length of the title shown in the calendar)  
or when they look at the individual entry.  
  
Example of exploitation:  
  
Insert an event with text: <script>alert(document.cookie);</script>  
  
  
Solution:  
- ---------  
  
Upgrade to phpEventCalendar 0.2.1  
  
  
Timeline  
- --------  
  
07/01/2005 - Vulnerability found  
07/01/2005 - Vendor contacted  
08/01/2005 - Vendor replied confirming bug  
18/01/2005 - New version released  
25/01/2005 - Advisory released  
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