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PHPNuke <= 8.0 Cookie Manipulation (lang)

PROGRAM: PHP-Nuke
HOMEPAGE: http://phpnuke.org/ 
VERSION: All version
BUG: Cookie Manipulation (lang) (SQL Injection + Local file include)
AUTHOR: Aleksandar aka sale83

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PHP.ini
Magic Quotes  = OFF 
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PHP-Nuke - >Preferences - > Multilingual Options-> On (Activate Multilingual features?  = YES)
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Bug is found in mainfile.php line 327.

// Line 327 Bug is here 
} elseif (isset($lang)) {
	include_once("language/lang-".$lang.".php"); // This can be exploited by malicious users: ex: /../../robots.txt%00 Multilingual Options=OFF
	$currentlang = $lang; // This can be exploited by malicious users. ex:SQL Injection in Top and News Module ($currentlang) Multilingual Options = On
} else {

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This flaw is due to an error when handling the "lang" cookie parameter, which could be exploited by malicious users because $lang is not filtered. 


Tested On:
Windows XP
Linux SlackWare 10.2
PHP Version 5.1.4
PHPNuke 8.0 ,7.9,7.6
Magic Quotes = OFF
Firefox  2 + Add N Edit Cookies Add-ons


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Patch:

} elseif (isset($lang)) {
   if (eregi('[A-Za-z]', $lang)) {
      if (file_exists("language/lang-".$lang.".php")) {
	       include_once("language/lang-".$lang.".php");
	        $currentlang = $lang;
	    }else {
		  include_once("language/lang-english.php");
	                $currentlang = "english";
		} 
	  }else {
	   include_once("language/lang-english.php");
	   $currentlang = "english";
	  }
} else {

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Best Regards
Aleksandar
Programmer and Web Developer
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