*********************************************************************
* CODEBUG Labs
* Advisory #8
* Title: Multiple vulnerabilities in Topic Calendar 1.0.1 for phpBB
* Author: Alberto Trivero
* English Version: Alberto Trivero
* Product: Topic Calendar 1.0.1
* Type: Multiple Vulnerabilities
* Web: http://www.codebug.org/ 
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--) Software Page (www.phpbb.com/phpBB/viewtopic.php?t=150857) 

Topic Calendar is a quite widespread MOD for phpBB all version that will add
a calendar
to the board, using topics as event. The authorizations are managed at
forums, groups
and users level, as the standard phpBB auths.


--) Full Path Disclosure

If phpBB is running on a Microsoft IIS Server, it's possible to obtain the
full path by
sending simples requests like these:

http://www.example.com/phpbb/calendar_scheduler.php%5C 
http://www.example.com/phpbb/calendar_scheduler.php?d=-1 

Note that these requests doesn't works under the others webservers like
Apache.


--) Cross-Site Scripting (XSS)

Let's look at code from calendar_scheduler.php at line 82:

   

and at line 375:

   ';
   ...
   ?>

$start is a variable that can be controlled by a remote user, and, as we can
see, there
isn't any control on she, so anyone con inject some HTML code like:

   ">

that will change the HTML line in:

   " />

executing the  tag that show, in this case, the cookies.
This is the complete URL:


http://www.example.com/phpbb/calendar_scheduler.php?start=%22%3 E%3Cscript%3E
alert(document.cookie)%3C/script%3E


--) Patch

To fix the XSS bug we can use the function intval() at line 85 of
calendar_scheduler.php:

   



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